CN114293711A - Reinforced concrete member - Google Patents
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- CN114293711A CN114293711A CN202210095735.1A CN202210095735A CN114293711A CN 114293711 A CN114293711 A CN 114293711A CN 202210095735 A CN202210095735 A CN 202210095735A CN 114293711 A CN114293711 A CN 114293711A
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- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 52
- 239000011241 protective layer Substances 0.000 claims abstract description 111
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 95
- 239000010959 steel Substances 0.000 claims abstract description 95
- 239000004567 concrete Substances 0.000 claims abstract description 29
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 25
- 238000005253 cladding Methods 0.000 claims abstract description 6
- 210000003205 muscle Anatomy 0.000 claims abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 description 9
- 230000005484 gravity Effects 0.000 description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a reinforced concrete member, comprising: indulge muscle, horizontal reinforcing bar and concrete, the concrete cladding is in the periphery of horizontal reinforcing bar, horizontal reinforcing bar includes: a body having a profiled cross-section; wherein different maximum dimensions of the profiled cross-section of the body in a first direction and a second direction perpendicular to each other are defined as a first dimension and a second dimension, respectively, the value of the first dimension being smaller than the value of the second dimension; in the first direction, the distance from the outer edge of the transverse steel bar to the concrete surface is defined as the thickness of the protective layer, and the ratio of the first dimension to the thickness of the protective layer ranges from 0.04 to 0.71. The reinforced concrete member has the beneficial effects that the reinforced concrete member is reasonable and reliable in section shape and can improve the bearing capacity.
Description
Technical Field
The invention relates to the field of buildings, in particular to a reinforced concrete member.
Background
At present, high-strength steel bars are widely popularized and applied in China, introduction of the high-strength transverse steel bars is imperative, and how to reasonably and effectively apply the high-strength transverse steel bars becomes an important problem in engineering application. Compared with the common 400 MPa-level transverse steel bar, the yield strength of the high-strength transverse steel bar is greatly improved, and due to the improvement of the strength of the high-strength steel bar, the constraint force provided by the high-strength transverse steel bar is far greater than that of the common transverse steel bar under the condition of the same area, so that the strength redundancy and the waste of steel are certainly caused. In addition, the crack of the reinforced concrete structural member is an important index for normal use of the structure, so that the crack of the member is strictly limited in the concrete structure design specification of China, and the crack width of the member is closely related to the thickness of the protective layer of the longitudinal rib, so that if the size of the transverse steel bar can be reduced and the strength requirements of the member such as shearing and the like can be met, the thickness of the calculated protective layer can be correspondingly reduced, the calculated crack width of the structural member can be further reduced, and the durability of the structural member can be guaranteed. Meanwhile, because the effective height of the section of the reinforced concrete structural member is an important parameter for determining the bearing capacity of the member, if the distance from the center of gravity of a tensioned longitudinal bar of the reinforced concrete structural member to the tensioned edge of concrete is reduced, the effective height of the section of the member can be correspondingly increased, which is more beneficial to the bearing of the member.
Disclosure of Invention
In order to solve the deficiencies of the prior art, the present application provides a reinforced concrete member comprising: indulge muscle, horizontal reinforcing bar and concrete, the concrete cladding is in the periphery of horizontal reinforcing bar, horizontal reinforcing bar includes:
a body having a profiled cross-section;
wherein different maximum dimensions of the profiled cross-section of the body in a first direction and a second direction perpendicular to each other are defined as a first dimension and a second dimension, respectively, the value of the first dimension being smaller than the value of the second dimension;
in the first direction, the distance from the outer edge of the transverse steel bar to the concrete surface is defined as the thickness of the protective layer, and the ratio of the first dimension to the thickness of the protective layer ranges from 0.04 to 0.71.
Further, the ratio of the first dimension to the thickness of the protective layer ranges from 0.05 to 0.66.
Further, the ratio of the first dimension to the thickness of the protective layer ranges from 0.06 to 0.57.
Further, the ratio of the first dimension to the thickness of the protective layer ranges from 0.07 to 0.50.
Further, the ratio of the first dimension to the thickness of the protective layer ranges from 0.08 to 0.47.
Further, the special-shaped cross section comprises at least one arc edge, and the value range of the ratio of the curvature radius of the arc edge to the thickness of the protective layer is 0.02-1.37.
Further, the ratio of the curvature radius of the arc edge to the thickness of the protective layer ranges from 0.10 to 1.03.
Further, the ratio of the curvature radius of the arc edge to the thickness of the protective layer ranges from 0.20 to 0.80.
Further, the ratio of the curvature radius of the arc edge to the thickness of the protective layer ranges from 0.03 to 0.26.
Further, the value range of the first dimension and the thickness of the protective layer is 0.05 to 0.53.
Further, the ratio of the first size to the diameter of the longitudinal bar ranges from 0.056 to 0.757.
Further, when the diameter of the longitudinal rib is 14mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.143 to 0.757.
Further, when the diameter of the longitudinal rib is 16mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.125-0.663.
Further, when the diameter of the longitudinal rib is 18mm, the value range of the ratio of the first dimension to the diameter of the longitudinal rib is 0.111 to 0.589.
Further, when the diameter of the longitudinal rib is 20mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.100 to 0.530.
Further, when the diameter of the longitudinal rib is 22mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.091-0.482.
Further, when the diameter of the longitudinal rib is 25mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.080-0.424.
Further, when the diameter of the longitudinal rib is 28mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.071 to 0.379.
Furthermore, when the diameter of the longitudinal rib is 32mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.063-0.331.
Further, when the diameter of the longitudinal rib is 36mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.056 to 0.294.
Further, the edge where the second direction is located is defined as a long axis, and when the transverse steel bars are bonded and bound with the longitudinal bars of the reinforced concrete member, the long axis of the section of the transverse steel bars is always kept parallel to the longitudinal bars in the axial direction; and defining the edge where the first direction is located as a short shaft, wherein the short shaft of the cross section of the transverse steel bar is always vertical to the longitudinal bar when the transverse steel bar is bonded and bound with the longitudinal bar of the reinforced concrete member.
The application has the advantages that: the reinforced concrete member has reasonable and reliable section shape and can improve bearing capacity.
Drawings
Fig. 1 is a schematic view of a first embodiment of a transverse reinforcing bar cross section of the present invention.
Fig. 2 is a schematic view of a second embodiment of the cross-section of the transverse reinforcing bar of the present invention.
Fig. 3 is a schematic view of a third embodiment of the cross-section of the transverse reinforcing bar of the present invention.
Fig. 4 is a schematic view of the transverse reinforcement end hook arrangement of the present invention.
Fig. 5 is a schematic view of the binding of the transverse reinforcing bars of fig. 4 with the longitudinal bars of the structural beams and columns.
Fig. 6 is a transverse reinforcement profile along the column axis of the present invention.
Fig. 7 is a profile of the transverse reinforcing bars of the present invention along the beam axis.
In the above figures, L denotes the second dimension, B denotes the first dimension, r denotes the arc radius of the flat-shaped transverse reinforcement, 1 denotes the transverse reinforcement, 2 denotes concrete, 3 denotes the longitudinal reinforcement, 4 denotes the column longitudinal reinforcement, and 5 denotes the beam longitudinal reinforcement.
Detailed Description
The invention will be described in further detail below with reference to the figures and specific embodiments.
Example 1
As shown in fig. 1, the present embodiment provides a reinforced concrete member, comprising: indulge muscle, horizontal reinforcing bar and concrete, the concrete cladding is in the periphery of horizontal reinforcing bar, and horizontal reinforcing bar includes:
a body having a rectangular cross-section;
the different maximum sizes of the body in a first direction and a second direction which are perpendicular to each other in the rectangular section are respectively defined as a first size and a second size, and the value of the first size is smaller than that of the second size, so that the body is called as a flat special-shaped transverse steel bar;
in the first direction, the distance from the outer edge of the transverse steel bar to the concrete surface is the thickness of the protective layer, and the value range of the ratio of the first size to the thickness of the protective layer is 0.04-0.71.
When the first size is close to the second size, the second size is 10.6mm, and when the cross-sectional shape is close to a strip shape, the first size is 2mm, and the second size is 56.5 mm; therefore, when the first dimension is 2mm and the protective layer thickness is 50mm, the ratio is 0.04; when the maximum value of the first dimension is 10.6mm of the second dimension and the thickness of the protective layer is 15mm, the ratio is 0.71.
Specifically, the value range of the ratio of the first size to the thickness of the protective layer is 0.05-0.66, and when the first size is 2.5mm and the thickness of the protective layer is 50mm, the ratio is 0.05; when the first dimension was 9.9mm and the protective layer thickness was 15mm, the ratio was 0.66.
Specifically, the value range of the ratio of the first size to the thickness of the protective layer is 0.06-0.57, and when the first size is 3mm and the thickness of the protective layer is 50mm, the ratio is 0.06; when the first dimension is 8.5mm and the thickness of the protective layer is 15mm, the ratio is 0.57.
Specifically, the value range of the ratio of the first size to the thickness of the protective layer is 0.07-0.50, and when the first size is 3.5mm and the thickness of the protective layer is 50mm, the ratio is 0.07; when the first dimension is 7.5mm and the protective layer thickness is 15mm, the ratio is 0.50.
Specifically, the ratio of the first size to the thickness of the protective layer ranges from 0.08 to 0.47, and when the first size is 4mm and the thickness of the protective layer is 50mm, the ratio is 0.08; when the first dimension was taken to be 7mm and the protective layer thickness was taken to be 15mm, the ratio was 0.47.
Specifically, the first dimension B is the width of the rectangular cross section, the second dimension L is the length of the rectangular cross section, and the ratio of the first dimension to the thickness of the protective layer is preferably in the range of 0.05 to 0.53; when the first size is 2.5mm and the thickness of the protective layer is 50mm, the ratio is 0.05; when the first size is 8.0mm and the thickness of the protective layer is 15mm, the ratio is 0.53; table 3 provides the requirements of the thickness of the protective layer in "concrete structure design specifications" in different environmental categories, and the effective height of the section of the reinforced concrete structure member using the circular-section transverse steel bar is as follows under the condition that the thickness of the protective layer is equal: the section height, the thickness of a protective layer, the diameter of a transverse steel bar with a circular section, and the distance from the center of gravity of a longitudinal bar in a tension area to the inner edge of the transverse steel bar; the effective height of the reinforced concrete structural member cross section using the flat special-shaped transverse steel bars is as follows: the section height, the thickness of a protective layer, the minor axis size of a flat special-shaped transverse steel bar, and the distance from the center of gravity of a longitudinal bar in a tension area to the inner edge of the transverse steel bar; from the range of the ratio of the first dimension to the second dimension, it can be seen that the minor axis dimension of the flat-shaped transverse steel bar is about 50% of the major axis dimension, and the major axis dimension is about equal to the diameter of the transverse steel bar with a circular cross section, so that the effective height of the cross section of the reinforced concrete structural member using the flat-shaped transverse steel bar is increased, and the bearing capacity of the corresponding member is improved according to the specification of the concrete structure design specification.
Example 2
As shown in fig. 2, the present embodiment provides a reinforced concrete member, including: indulge muscle, horizontal reinforcing bar and concrete, the concrete cladding is in the periphery of horizontal reinforcing bar, and horizontal reinforcing bar includes:
a body having a trapezoidal cross-section;
the different maximum sizes of the body in a first direction and a second direction, which are perpendicular to each other, of the trapezoidal section are respectively defined as a first size and a second size, and the value of the first size is smaller than that of the second size, so that the body is called as a flat special-shaped transverse steel bar;
in the first direction, the distance from the outer edge of the transverse steel bar to the concrete surface is the thickness of the protective layer, and the value range of the ratio of the first size to the thickness of the protective layer is 0.04-0.71.
When the first size is close to the second size, the second size is 10.6mm, and when the cross-sectional shape is close to a strip shape, the first size is 2mm, and the second size is 56.5 mm; therefore, when the first dimension is 2mm and the protective layer thickness is 50mm, the ratio is 0.04; when the maximum value of the first dimension is 10.6mm of the second dimension and the thickness of the protective layer is 15mm, the ratio is 0.71.
Specifically, the value range of the ratio of the first size to the thickness of the protective layer is 0.05-0.66, and when the first size is 2.5mm and the thickness of the protective layer is 50mm, the ratio is 0.05; when the first dimension was 9.9mm and the protective layer thickness was 15mm, the ratio was 0.66.
Specifically, the value range of the ratio of the first size to the thickness of the protective layer is 0.06-0.57, and when the first size is 3mm and the thickness of the protective layer is 50mm, the ratio is 0.06; when the first dimension was taken to be 8.5mm and the protective layer thickness was taken to be 15mm, the ratio was 0.57.
Specifically, the value range of the ratio of the first size to the thickness of the protective layer is 0.07-0.50, and when the first size is 3.5mm and the thickness of the protective layer is 50mm, the ratio is 0.07; when the first dimension is 7.5mm and the protective layer thickness is 15mm, the ratio is 0.50.
Specifically, the ratio of the first size to the thickness of the protective layer ranges from 0.08 to 0.47, and when the first size is 4mm and the thickness of the protective layer is 50mm, the ratio is 0.08; when the first dimension was taken to be 7mm and the protective layer thickness was taken to be 15mm, the ratio was 0.47.
Specifically, the first dimension B is the height of the trapezoidal section, the second dimension L is the bottom of the trapezoidal section, and the ratio of the first dimension to the thickness of the protective layer is preferably in the range of 0.05 to 0.53; when the first size is 2.5mm and the thickness of the protective layer is 50mm, the ratio is 0.05; when the first size is 8.0mm and the thickness of the protective layer is 15mm, the ratio is 0.53; table 3 provides the requirements of the thickness of the protective layer in "concrete structure design specifications" in different environmental categories, and the effective height of the section of the reinforced concrete structure member using the circular-section transverse steel bar is as follows under the condition that the thickness of the protective layer is equal: the section height, the thickness of a protective layer, the diameter of a transverse steel bar with a circular section, and the distance from the center of gravity of a longitudinal bar in a tension area to the inner edge of the transverse steel bar; the effective height of the reinforced concrete structural member cross section using the flat special-shaped transverse steel bars is as follows: the section height, the thickness of a protective layer, the minor axis size of a flat special-shaped transverse steel bar, and the distance from the center of gravity of a longitudinal bar in a tension area to the inner edge of the transverse steel bar; from the range of the ratio of the first dimension to the second dimension, it can be seen that the minor axis dimension of the flat-shaped transverse steel bar is about 50% of the major axis dimension, and the major axis dimension is about equal to the diameter of the transverse steel bar with a circular cross section, so that the effective height of the cross section of the reinforced concrete structural member using the flat-shaped transverse steel bar is increased, and the bearing capacity of the corresponding member is improved according to the specification of the concrete structure design specification.
Example 3
As shown in fig. 3, the present embodiment provides a reinforced concrete member, including: indulge muscle, horizontal reinforcing bar and concrete, the concrete cladding is in the periphery of horizontal reinforcing bar, and horizontal reinforcing bar includes:
a body having a cross-section resembling a racetrack;
the different maximum sizes of the body in a first direction and a second direction which are perpendicular to each other on the section are respectively defined as a first size and a second size, and the value of the first size is smaller than that of the second size, so that the body is called as a flat special-shaped transverse steel bar;
in the first direction, the distance from the outer edge of the transverse steel bar to the concrete surface is the thickness of the protective layer, and the value range of the ratio of the first size to the thickness of the protective layer is 0.04-0.71.
When the first size is close to the second size, the second size is 10.6mm, and when the cross-sectional shape is close to a strip shape, the first size is 2mm, and the second size is 56.5 mm; therefore, when the first dimension is 2mm and the protective layer thickness is 50mm, the ratio is 0.04; when the maximum value of the first dimension is 10.6mm of the second dimension and the thickness of the protective layer is 15mm, the ratio is 0.71.
Specifically, the value range of the ratio of the first size to the thickness of the protective layer is 0.05-0.66, and when the first size is 2.5mm and the thickness of the protective layer is 50mm, the ratio is 0.05; when the first size is 9.9mm and the thickness of the protective layer is 15mm, the ratio is 0.66;
specifically, the value range of the ratio of the first size to the thickness of the protective layer is 0.06-0.57, and when the first size is 3mm and the thickness of the protective layer is 50mm, the ratio is 0.06; when the first dimension was taken to be 8.5mm and the protective layer thickness was taken to be 15mm, the ratio was 0.57.
Specifically, the value range of the ratio of the first size to the thickness of the protective layer is 0.07-0.50, and when the first size is 3.5mm and the thickness of the protective layer is 50mm, the ratio is 0.07; when the first dimension is 7.5mm and the protective layer thickness is 15mm, the ratio is 0.50.
Specifically, the ratio of the first size to the thickness of the protective layer ranges from 0.08 to 0.47, and when the first size is 4mm and the thickness of the protective layer is 50mm, the ratio is 0.08; when the first dimension was taken to be 7mm and the protective layer thickness was taken to be 15mm, the ratio was 0.47.
Specifically, this cross-section contains two circular arc limits and two straight line limits, and two circular arc limits set up relatively, and two straight line limits are relative and parallel arrangement, and the straight line limit sets up and makes whole cross-section be the runway shape between the circular arc limit, and the central angle angular range that the circular arc limit corresponds is 30 to 330, and the ratio value scope of the radius of curvature r on circular arc limit and protective layer thickness is 0.02 to 1.37. When the r is 1mm and the thickness of the protective layer is 50mm, the ratio is 0.02, the central angle corresponding to the arc edge is 180 degrees, and the minimum value of the first size is 2 mm; when the r is 20.48mm and the thickness of the protective layer is 15mm, the ratio is 1.37, the central angle corresponding to the arc edge is 30 degrees, and the maximum value of the first size is 10.6 mm.
Specifically, the ratio of the curvature radius of the arc edge to the thickness of the protective layer ranges from 0.20 to 0.80, and when r is 10mm and the thickness of the protective layer is 50mm, the ratio is 0.20; when r is 12mm and the thickness of the protective layer is 15mm, the ratio is 0.80.
Specifically, the ratio of the curvature radius of the arc edge to the thickness of the protective layer ranges from 0.10 to 1.03, and when r is 5mm and the thickness of the protective layer is 50mm, the ratio is 0.10; when r is 15.5mm and the thickness of the protective layer is 15mm, the ratio is 1.03.
Preferably, the ratio of the curvature radius of the arc edge to the thickness of the protective layer ranges from 0.03 to 0.26, and when r is 1.5mm and the thickness of the protective layer is 50mm, the ratio is 0.03; when r is 3.9mm and the protective layer thickness is 15mm, the ratio is 0.26.
In the above embodiment, the radius of curvature r of the arc side is preferably in the range of 1.2mm to 4mm, B is preferably in the range of 2.4mm to 8mm, L is preferably in the range of 4.8mm to 16mm, and r is half of B, which is about half of L.
Table 1 provides the cross-sectional dimensions of the round-section transverse steel bars of the conventional specifications, and table 2 provides the cross-sectional dimensions of the flat-shaped transverse steel bars of 660MPa, 760MPa and 860MPa grades; as can be seen from table 2, r is half of B and L is about twice as long as B, and thus it is called a flat-shaped transverse bar.
In practical engineering application, the diameters of the longitudinal bars with common specifications are 14, 16, 18, 20, 22, 25, 28, 32 and 36, the units of the longitudinal bars are mm, the range of the first size of the flat special-shaped transverse steel bar is 2-10.6mm, and therefore the value range of the ratio of the first size to the diameter of the longitudinal bars can be calculated to be 0.056-0.757; when the diameters of the longitudinal bars are respectively different specifications of 14-32mm, the values of the ratio of the first size of the corresponding flat-shaped transverse steel bar to the diameter of the longitudinal bar are respectively 0.143-0.757, 0.125-0.663, 0.111-0.589, 0.100-0.530, 0.091-0.482, 0.080-0.424, 0.071-0.379 and 0.063-0.331.
Referring to tables 4-8, the design value of the tensile strength of the HRB 400-grade transverse steel bar is 360MPa, and the design value of the tensile strength of the 430-grade flat special-shaped transverse steel bar is 430/1.1=391 MPa; the 460-level flat special-shaped transverse steel bar is: 460/1.1=418 MPa; the 560-level flat special-shaped transverse steel bar is: 560/1.15=487 MPa; the 660-level flat special-shaped transverse steel bar is: 660/1.15=574 MPa; the 760-grade flat special-shaped transverse steel bar comprises: 760/1.15=661 MPa; the 860-grade flat special-shaped transverse steel bar comprises: 860/1.15=748 MPa; the 960-level flat special-shaped transverse steel bar comprises: 960/1.15=835MPa, where 1.1 and 1.15 are both material term coefficients, 1.1 on the 430 and 460 scale and 1.15 on the 560 to 960 scale. The cross-sectional area of the transverse steel bar with the diameter specification of 6mm and the circular cross-section is 28.27mm2Tension =360 × 28.27=10177.2, corresponding to a 660 MPa-grade flat deformed transverse bar: tension =574 × 17.96=10309.04, corresponding to a flat deformed transverse bar of 760MPa grade: tension =661 × 15.77=10423.97, corresponding to 860MPa grade flat deformed transverse bar: tension =748 × 13.71= 10255.08; similarly, the cross-sectional area of the round-section transverse steel bar with the diameter specification of 8mm is 50.27mm2Tension =360 × 50.27=18097.2, corresponding to a 660 MPa-grade flat deformed transverse bar: tension =574 × 31.07=17834.18, corresponding to flat deformed transverse bar of 760MPa class: tensile force =661 × 28.16=18613.76, corresponding to a 860 MPa-grade flat deformed transverse bar: tension =748 × 25.02= 18714.96; similarly, the cross-sectional area of the round-section transverse steel bar with the diameter specification of 10mm is 78.54mm2Tension =360 × 78.54=28274.4, corresponding to a flat deformed transverse bar of 660MPa class: tension =574 × 48.27=27706.98, corresponding to flat deformed transverse bar of 760MPa class: tension =661 × 43.63=28839.43, corresponding to 860MPa grade of flat deformed transverse bar: tension =748 × 37.31= 27907.88; similarly, the cross-sectional area of the circular cross-section transverse steel bar with the diameter specification of 12mm is 113.10mm2Tension =360 × 113.10=40716, corresponding to a flat deformed transverse bar of 660MPa class: tension =574 × 71.83=41230.42, corresponding to flat deformed transverse bar of 760MPa class: tension =661 × 63.06=41682.66, corresponding to 860MPa grade of flat deformed transverse bar: tension =748 × 54.86= 41035.28; above tensionAll units of (a) are "newtons (N)"; the data show that the four circular-section transverse steel bars with the common diameter specification of HRB400 grade and the flat special-shaped transverse steel bars have almost equal tension at 660MPa, 760MPa and 860 MPa; under the condition of equal tension, the comparison of the cross-sectional areas of the round-section transverse steel bars and the flat-shaped transverse steel bars shows that the steel saving rates of the HRB 400-grade round-section transverse steel bars replaced by the 660MPa, 760MPa and 860 MPa-grade flat-shaped transverse steel bars are respectively about 37%, 44% and 51%.
The distance of the outward flange of horizontal reinforcing bar to concrete surface is protective layer thickness promptly, and under the equal condition of protective layer thickness, the longitudinal reinforcement protective layer thickness that uses the reinforced concrete structure component of the horizontal reinforcing bar of circular cross-section is: the thickness of the protective layer and the diameter of the transverse steel bar with the circular cross section; the thickness of the longitudinal bar protective layer of the reinforced concrete structural member using the flat special-shaped transverse steel bar is as follows: the thickness of the protective layer plus the size of the short axis of the flat special-shaped transverse steel bar; as can be seen from tables 1 and 2, in the case of equal strength replacement, the minor axis dimension of the flat-shaped transverse steel bar is only about 50% of the diameter of the circular-section transverse steel bar; therefore, the thickness of the longitudinal reinforcement protective layer of the reinforced concrete structural member using the flat special-shaped transverse reinforcing steel bars is greatly reduced, the calculation cracks of the corresponding member are reduced according to the regulation of concrete structure design specifications, and the durability of the structural member is ensured on the basis of ensuring steel saving.
Under the condition that the thickness of the protective layer is equal, the effective height of the section of the reinforced concrete structural member using the circular-section transverse steel bar is as follows: the section height, the thickness of a protective layer, the diameter of a transverse steel bar with a circular section, and the distance from the center of gravity of a longitudinal bar in a tension area to the inner edge of the transverse steel bar; the effective height of the reinforced concrete structural member cross section using the flat special-shaped transverse steel bars is as follows: the section height, the thickness of a protective layer, the minor axis size of a flat special-shaped transverse steel bar, and the distance from the center of gravity of a longitudinal bar in a tension area to the inner edge of the transverse steel bar; it can be seen from tables 1 and 2 that, in the case of equal strength replacement, the minor axis dimension of the flat deformed transverse steel bar is only about 50% of the diameter of the transverse steel bar with a circular cross section, so that the effective height of the cross section of the reinforced concrete structural member using the flat deformed transverse steel bar is increased, and the bearing capacity of the corresponding member is improved according to the specification of the concrete structure design specification.
TABLE 1 common specification transverse steel bar size table
Table 2 flat special-shaped transverse reinforcing steel bar size table
TABLE 3 thickness (mm) of concrete protective layer
TABLE 4
TABLE 5
TABLE 6
TABLE 7
TABLE 8
In example 3, an implementation method of a flat special-shaped transverse steel bar in a reinforced concrete beam and column is provided, referring to fig. 4-7, a hook is arranged at the tail end of the flat special-shaped transverse steel bar according to fig. 4, under the earthquake-proof condition, an included angle alpha is formed between the bending direction of the hook and the long axis direction of the cross section, and the length h of the tail end of the hook is not less than 20 times of the minor axis size of the transverse steel bar and is not less than 75 mm; under the non-anti-seismic condition, the tail end of the transverse steel bar adopts a 90-degree hook, and the length h of the tail end of the hook is not less than 10 times of the minor axis size; under the condition of torsion, the tail end of the transverse steel bar adopts a 135-degree hook, and the length h of the tail end of the hook is not less than 20 times of the minor axis size; processing the flat special-shaped transverse steel bar into a form of a closed rectangular hoop according to a figure 5, and binding the flat special-shaped transverse steel bar with the longitudinal bar 3; the flat special-shaped transverse steel bars are distributed along the axial lines of the beam longitudinal bars 5 and the column longitudinal bars 4 as shown in fig. 7 and 6, and referring to the enlarged partial views in fig. 6 and 7, when the flat special-shaped transverse steel bars are bonded and bound with the longitudinal bars of the structural member, the long axes of the flat special-shaped transverse steel bars are always parallel to the axial direction of the longitudinal bars, or the short axes of the cross sections of the flat special-shaped transverse steel bars are always perpendicular to the axial direction of the longitudinal bars.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (22)
1. A reinforced concrete member comprising: indulge muscle, horizontal reinforcing bar and concrete, the concrete cladding is in the periphery of horizontal reinforcing bar, its characterized in that:
the transverse reinforcing bar includes:
a body having a profiled cross-section;
wherein different maximum dimensions of the profiled cross-section of the body in a first direction and a second direction perpendicular to each other are defined as a first dimension and a second dimension, respectively, the value of the first dimension being smaller than the value of the second dimension;
in the first direction, the distance from the outer edge of the transverse steel bar to the concrete surface is defined as the thickness of the protective layer, and the ratio of the first dimension to the thickness of the protective layer ranges from 0.04 to 0.71.
2. A reinforced concrete element as claimed in claim 1, wherein:
the ratio of the first dimension to the thickness of the protective layer ranges from 0.05 to 0.66.
3. A reinforced concrete element as claimed in claim 1, wherein:
the ratio of the first dimension to the thickness of the protective layer ranges from 0.06 to 0.57.
4. A reinforced concrete element as claimed in claim 1, wherein:
the ratio of the first dimension to the thickness of the protective layer ranges from 0.07 to 0.50.
5. A reinforced concrete element as claimed in claim 1, wherein:
the ratio of the first dimension to the thickness of the protective layer ranges from 0.08 to 0.47.
6. A reinforced concrete element as claimed in claim 1, wherein:
the special-shaped section comprises at least one arc edge, and the ratio of the curvature radius of the arc edge to the thickness of the protective layer ranges from 0.02 to 1.37.
7. A reinforced concrete element as claimed in claim 6, wherein:
the ratio of the curvature radius of the arc edge to the thickness of the protective layer ranges from 0.10 to 1.03.
8. A reinforced concrete element as claimed in claim 6, wherein:
the ratio of the curvature radius of the arc edge to the thickness of the protective layer ranges from 0.20 to 0.80.
9. A reinforced concrete element as claimed in claim 6, wherein:
the ratio of the curvature radius of the arc edge to the thickness of the protective layer ranges from 0.03 to 0.26.
10. A reinforced concrete element as claimed in claim 1, wherein:
the ratio of the first dimension to the thickness of the protective layer ranges from 0.05 to 0.53.
11. A reinforced concrete element as claimed in claim 1, wherein: the ratio of the first dimension to the diameter of the longitudinal bar ranges from 0.056 to 0.757.
12. A reinforced concrete element as claimed in claim 1, wherein: when the diameter of the longitudinal rib is 14mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.143 to 0.757.
13. A reinforced concrete element as claimed in claim 1, wherein: when the diameter of the longitudinal rib is 16mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.125-0.663.
14. A reinforced concrete element as claimed in claim 1, wherein: when the diameter of the longitudinal rib is 18mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.111-0.589.
15. A reinforced concrete element as claimed in claim 1, wherein: when the diameter of the longitudinal rib is 20mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.100-0.530.
16. A reinforced concrete element as claimed in claim 1, wherein: when the diameter of the longitudinal rib is 22mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.091-0.482.
17. A reinforced concrete element as claimed in claim 1, wherein: when the diameter of the longitudinal rib is 25mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.080-0.424.
18. A reinforced concrete element as claimed in claim 1, wherein: when the diameter of the longitudinal rib is 28mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.071-0.379.
19. A reinforced concrete element as claimed in claim 1, wherein: when the diameter of the longitudinal rib is 32mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.063-0.331.
20. A reinforced concrete element as claimed in claim 1, wherein: when the diameter of the longitudinal rib is 36mm, the value range of the ratio of the first size to the diameter of the longitudinal rib is 0.056 to 0.294.
21. A reinforced concrete element according to any one of claims 1 to 20, wherein: and defining the edge where the second direction is located as a long axis, wherein when the transverse steel bars are bonded and bound with the longitudinal bars of the reinforced concrete member, the long axis of the section of the transverse steel bars is always kept parallel to the longitudinal bars in the axial direction.
22. The transverse bar according to any one of claims 1 to 20, wherein: and defining the edge where the first direction is located as a short shaft, wherein the short shaft of the cross section of the transverse steel bar is always vertical to the longitudinal bar when the transverse steel bar is bonded and bound with the longitudinal bar of the reinforced concrete member.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021109018585 | 2021-08-06 | ||
| CN202110901858 | 2021-08-06 | ||
| CN2021114460513 | 2021-11-30 | ||
| CN202111446051 | 2021-11-30 |
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| CN114293711A true CN114293711A (en) | 2022-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210095735.1A Pending CN114293711A (en) | 2021-08-06 | 2022-01-26 | Reinforced concrete member |
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| CN (1) | CN114293711A (en) |
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|---|---|---|---|---|
| JPH06229071A (en) * | 1993-02-04 | 1994-08-16 | Kajima Corp | Reinforcing bar and bar arrangement for reinforced concrete structure |
| JP2006104884A (en) * | 2004-10-08 | 2006-04-20 | Nippon Steel Corp | Concrete reinforcement |
| CN101240646A (en) * | 2008-01-03 | 2008-08-13 | 上海交通大学 | Methods of Improving the Durability of Reinforced Concrete Structures |
| CN103590538A (en) * | 2013-11-07 | 2014-02-19 | 于国友 | Non-circular rib for concrete |
| CN103758285A (en) * | 2013-12-24 | 2014-04-30 | 陈胜民 | Elliptical-rhombic efficient high-strength threaded reinforcing steel bar and use method thereof |
| CN104204377A (en) * | 2012-04-02 | 2014-12-10 | 东京铁钢株式会社 | Rebar assemblies and shear reinforcement for reinforced concrete structures |
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2022
- 2022-01-26 CN CN202210095735.1A patent/CN114293711A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06229071A (en) * | 1993-02-04 | 1994-08-16 | Kajima Corp | Reinforcing bar and bar arrangement for reinforced concrete structure |
| JP2006104884A (en) * | 2004-10-08 | 2006-04-20 | Nippon Steel Corp | Concrete reinforcement |
| CN101240646A (en) * | 2008-01-03 | 2008-08-13 | 上海交通大学 | Methods of Improving the Durability of Reinforced Concrete Structures |
| CN104204377A (en) * | 2012-04-02 | 2014-12-10 | 东京铁钢株式会社 | Rebar assemblies and shear reinforcement for reinforced concrete structures |
| CN103590538A (en) * | 2013-11-07 | 2014-02-19 | 于国友 | Non-circular rib for concrete |
| CN103758285A (en) * | 2013-12-24 | 2014-04-30 | 陈胜民 | Elliptical-rhombic efficient high-strength threaded reinforcing steel bar and use method thereof |
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