JP2551234B2 - Composite welder for column-beam joints for non-welded buildings - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a non-welding type joining fitting for a building, which is applied to joining an H-shaped steel beam and an H-shaped steel column of a skyscraper. It is a thing.

[Prior Art] In a conventional building, a method called a bracket method in which a beam is fixed to a placket welded to the column with high-strength bolts and nuts is used as a method for joining the column and the beam. The overhang length of this bracket is about 1.5 to 2.0 times the girder height (web) of the beam attached to the column.

In a skyscraper, the entire building acts as a seismic resistant structure, and in order to achieve the purpose of this flexible structure, the column-beam joint is a rigid joint, and the column-beam joint is It must be a structure that can smoothly transmit large stress concentrated on the. Naturally, the dimensional error of the large H-section steel used tends to accumulate as the layer becomes higher, and the column-beam joint is required to have high dimensional accuracy.

By the way, the flexible structure in a skyscraper is a structure that can generate a sufficient moment at the column-beam joint when the horizontal force of an earthquake is applied to the steel members of the building.
Since the contact rotation angle between each column and beam at the joint is small, this is a mechanism to absorb the energy of the earthquake by the bending deformation of the entire building.

In place of the above-described conventional bracket system, various joining metal fittings have been conceived and used for the purpose of reducing the number of assembling holes on site and maintaining the assembling accuracy.

For comparison, FIG. 4 shows various conventional column-beam joint structures, and FIG. 5 shows a graph for the relationship between the beam end moment and the nodal rotation angle according to the column-beam joint system.

4 and 5, FIG. 4 (A) is a side surface of the joining metal fitting corresponding to the graph A of FIG. 5, and FIG. 4 (B) is a side surface of the joining metal fitting corresponding to the graph B of FIG. , FIG. 4 (C) is a side surface of the metal fitting corresponding to the graph C in FIG. 5,
FIG. 4 (D) is a side view illustrating the side surface of the joint fitting corresponding to the graph D in FIG. 5, respectively.

However, the conventional bracket-type non-welded column-
Compared to the beam joint method, the split-tee type non-welding type column-beam joint tends to have insufficient rigidity.

Proposals have been made in JP-A-59-18833, JP-A-55-98546, and JP-A-60-250146 for joining metal fittings in which the rigidity of a non-welded column-beam joint is increased.

FIG. 6 is a side view of a weld-free type column-beam joint proposed in Japanese Patent Laid-Open No. 60-250146, which has the following description, and a T-type joint fitting is known.

That is, "In the conventional split-tee type joint structure, a split-tee, that is, a T-shaped joint is designed with a tensile force that is obtained by dividing the bending moment acting on the beam by the web height of the beam. The weld-free column-beam joint proposed in the above-mentioned Japanese Laid-Open Patent Publication As for the conventional non-welding type column-beam T-joint fittings including the fittings, one using one T-joint fitting at the top and one at the top is widely practiced.

[Problems to be Solved by the Invention] However, it has been confirmed that the joining rigidity in the prior art when one set of T-shaped joining fittings is used has a high rigidity shown by a curve D in FIG. In a skyscraper, the beam end moment is too large and the web thickness of the T-shaped joint is too thick.
Since the flange portion of the beam of shaped steel is bolted by laminating one piece each, there is a drawback that the shearing force that can be transmitted per bolt is small and a large number of bolts are required.

In addition, since the conventional joining metal fitting is too thick, the weight per metal fitting is large, it is difficult to perform the mounting work at a high place, and a large number of bolts are required. However, there is a drawback that the rigidity becomes insufficient and the integrity cannot be maintained.

The present invention has been made in view of such circumstances, and the metal fitting 1
The weight of each piece is lightened to facilitate installation work at high places, and the weight of the entire fitting is lightened to reduce the material cost.

[Means for Solving the Problem] A composite joint metal fitting of a joint between a pillar and a beam of a non-welding type building according to the present invention is L-shaped on the flange surface of the T-shaped metal fitting.
A joint structure having overlapping flange surfaces of a H-shaped joint metal fitting, wherein a flange portion of a beam of H-shaped steel has a high-strength bolt and a nut between the web of the T-shaped metal fitting and the web of the L-shaped metal joint. The three-layer member sandwiched between and is fixed to form a beam unit, which is attached to the column portion.

[Operation] In the composite joint structure of the column-beam joints of the skyscraper according to the present invention, the flange portion of the beam of H-shaped steel is sandwiched from above and below by the web of the T-shaped joint metal fittings and the web of the L-shaped joint metal fittings. The members of (1) are connected with high-strength bolts and nuts.

Further, the flange portion of the H-shaped steel pillar is overlapped with the flange portion of the T-shaped joint metal fitting and the flange portion of the L-shaped joint metal fitting, and one side of the flange portion of the T-shaped joint metal fitting and the flange portion of the L-shaped joint metal fitting are formed. It is a rigid connection of high strength bolts and nuts.

With the above configuration, when a large bending moment acts on the end of the H-shaped steel beam due to an earthquake, the composite joint structure according to the present invention has a very high nodal rotation angle with a performance exceeding the curve D shown in FIG. It has a small structure and forms a sufficient flexible structural joint.

Further, from the principle of sandwiching the composite joining metal fitting according to the present invention, the shearing force acting on all the number of bolts rigidly connecting the flange portion of the H-shaped steel beam and the composite joining metal fitting is equalized and halved.

Furthermore, due to the combined use of the principle of superposition and the principle of sandwiching according to the present invention, even in the initial stage of deformation, in the elastic limit state and in the fully plastic state, the T-type joint fitting and the L-shaped joint fitting can be joined to each other by friction joining of the bolt.
By evenly distributing the reaction force of the metal touch part of the mold joint fitting on the long friction joint surface, the axial force acting on the bolt of the flange part of the column of the H-shaped rope is equalized, and the conventional T-joint fitting only Compared to the case, in the elastic limit state, the maximum bending moment was generated at the central part, but now it was generated at the bolt fastening part, and even in the fully plastic state, the bending yield was generated at the central part. Bending yield occurs at the fastening part.

Further, since the values of the maximum bending moment in the elastic limit state and the total plastic moment in the fully plastic state themselves become small, the initial rigidity and the yield strength become very large. As the deformation theory, all of the small deformation theory to the elasto-plastic theory can be applied, and the composite joining metal fitting of the present invention has extremely high rigidity, corresponds to the curve E shown in FIG. 5, and has a performance exceeding the curve D, The contact rotation angle is very small. That is,
The curve E shows a characteristic closer to the y-axis showing perfect rigid coupling than the curve D showing the characteristic though it is said to have high rigidity in the conventional example.

Therefore, as a result, the flange of the H-shaped steel beam is sandwiched between the web of the T-shaped joint fitting and the web of the L-shaped joint fitting, and the shearing force that can be held by one bolt is doubled. Since the length of the web portion can be shortened by about half, the weight of the joint fitting can be reduced and the mounting becomes easy.

Further, since the shearing force acting on the bolt at the flange portion of the H-shaped steel beam is halved, the T-shaped joint fitting and the L-shaped joint fitting and L Since the metal mold fittings can be reduced in thickness to half each, it is possible to reduce the cross-section loss ratio in the flange portion of the H-shaped steel beam and the web portion of the composite metal fitting, and to increase the initial rigidity and yield strength of the bonding member. As a result, the structure is rational with high rigidity.

The structure of the composite joining metal fitting of the present invention is shown in FIG.
And has a rigidity exceeding D, the bending moment at the beam end corresponding to the nodal rotation angle is large.

EXAMPLES Examples of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 is a side view of a composite joint metal fitting of a column-beam joint for a non-welded building according to an embodiment of the present invention.

In FIG. 1, 1 is a T-shaped fitting, and 2 is a column made of H-shaped steel. Reference numeral 3 is a beam made of H-shaped steel, and 4 is a flange of the T-shaped fitting 1. Reference numeral 5 is a web of the T-shaped fitting 1, and 6 is an L-shaped fitting. Reference numeral 7 is a high-strength bolt and nut, 8 is a flange of the L-shaped joint fitting 6, and 9 is a web of the L-shaped joint fitting 6.

On the outer surface of the flange 4 of the T-shaped metal fitting 1, the flange 8 of the L-shaped metal fitting 6 is separately superposed, and the web 5 of the T-shaped metal fitting 1 and the web 9 of the L-shaped metal fitting 6 are formed. The flange part of the beam 3 made of H-shaped steel is sandwiched from the front and back to form a three-layer structure, and the three-layer member centering on the flange of the beam 3 made of H-shaped steel is fixed by high-strength bolts and nuts to make it rigid. It is joined.

That is, the main part of the structure of the present invention is a composite joint structure in which the flange 8 surface of the L-shaped joint metal 6 is superposed on the flange 4 surface of the T-shaped joint metal 1, and the web of the T-shaped joint metal 1 is formed. No-welding, characterized in that a three-layer member in which the flange portion of the beam 3 made of H-shaped steel exists between the member 5 and the web 9 of the L-shaped joint fitting 6 is fixed by high-strength bolts 7 and nuts. This is a composite joining metal fitting of the prefabricated column and beam. In other words, the T-shaped joint fitting 1 flange 4 surface is used as a base, and the L-shaped joint fitting 6 flange 9 surface is overlapped to form a pillar-beam joint composite joint structure. With the web 9 of the L-shaped fitting 6, the flange of the H-shaped steel beam is sandwiched from the front and back to form a three-layer structure.
A three-layer member centering on the flange of the beam 3 made of shaped steel is fixed by high-strength bolts and nuts to form a rigid joint.

In the case of the composite joining metal fitting of the column-beam joint for a non-welded building, which is an embodiment of the present invention, since it is a nearly perfect rigid joint, it is close to the E curve of the graph shown in FIG. behavior,
That is, D, which was said to have high rigidity in the conventional technology
It behaves more like the y-axis, which indicates a completely rigid joint than the curve.

That is, since the composite joining metal fitting of the present invention has high initial rigidity and yield strength of the joining portion, it is a joining fitting for a non-welded building of a beam of H-section steel and a column of H-section steel of a flexible high-rise building. Is extremely excellent as

When using the composite joining metal fitting of the present invention, the flange 4 of the T-type fitting fitting 1 is attached to the column 2 made of H-shaped steel, the flange 4 of the T-shape fitting fitting 1 and the flange 8 of the L-shape fitting fitting 6 are used.
The column 2 and the beam 3 are rigidly joined by the high-strength bolt and the nut 7 while maintaining the gap between the column 2 and the beam 3 by the sum of the thickness of the column 2.
Further, the web 5 of the T-shaped fitting 1 and the web 9 of the L-shaped fitting 6 are rigidly joined by a high-strength bolt and a nut 7 with the flange of the beam 3 interposed therebetween.

As a comparative example to this, as shown in FIG.
The unwelded prefabricated column-beam joint fitting proposed in Japanese Patent No. 46 is shown. The flange 4 of the T-joint fitting 10 is attached to the pillar 2 made of H-section steel so that a gap is secured. The beam 3 and the high-strength bolt 7 are rigidly joined. The web 5 of the T-shaped joint fitting 10 is rigidly joined to the beam 3 by the bolt 7.

The web 5 of the T-shaped fitting 1 of the present invention and the prior art (6th
Comparing the web 5 of the T-shaped metal fitting 10 in the figure), the above-mentioned prior art requires about twice the web length.

The reason for this is that the web 5 of the T-joint 10 of the prior art has a shearing force acting on the bolt 7 rigidly joined to the beam 3 twice as much as in the case of the present invention, so that the number of bolts 7 is also doubled. Due to something.

Comparing the stresses of the present invention (FIG. 1) and the conventional joining metal fittings shown in FIG. 6, the flange portion of the beam 3 in the present invention shows that the web of the T-shaped fitting 1 and the web of the L-shaped fitting 6 are different. Since the three-layer member in which the flange portion of the H-shaped steel beam 3 is present is fixed by the high-strength bolt and the nut 7, the shearing force P acting on the flange portion of the H-shaped steel beam 3 is 1 /
A shearing force of 2, ie P / 2, acts between the faces of the three-layer member.

On the other hand, in the case of the conventional metal fitting shown in FIG. 6, the shearing force P acts between the surfaces of the two layers of members.

The present invention uses the T-shaped joint metal fitting 1 and the L-shaped joint metal fitting 6 having predetermined deformation characteristics with the front and back portions of the flange of the beam 3, and the T-shaped joint of the front portion on which a shearing force of P / 2 acts. It consists of the metal fitting 1 and the L-shaped joint metal fitting 6 on the back side where the shearing force of P / 2 acts, and the flanges of the two kinds of joint metal fittings are overlapped with each other, and the effect of simple beam forming of the flange and two kinds of joints The effect of decomposing the shearing force by sandwiching the beam flange with the web of the metal fitting, that is, the "superposing effect" and the "sandwiching effect" is exhibited, and the deformation characteristics of the frame can be made extremely rigid as compared with the conventional case.

Therefore, the required deformation characteristics can be secured by selecting the above two types of structures corresponding to the web height of the beam.

FIG. 2 shows another embodiment of the present invention, and FIG.
Is a plan view, FIG. 2 (b) is a side view, and the T-shaped fitting 1 and the L-shaped fitting 6 are divided into two in the width direction at the web portion of the beam 3, and the flanges of the column 2 and the beam 3 are shown. Suitable when the flatness of the surface is extremely poor.

FIG. 3 shows another embodiment of the present invention, and FIG.
Is a plan view and FIG. 3 (b) is a side view, in which the L-shaped fitting 6 is attached to the upper flange upper surface and the lower flange lower surface of the beam 3, and the flatness of only the flange surface of the column 2 is Suitable for extremely bad cases.

In the present invention, when the web plate 21 shown in FIG. 4 for transmitting the shearing force is used between the column 2 and the web of the beam 3, the shearing force is caused by the deformation of the hardware itself by using the high-strength bolt. It is necessary to use an L-shaped metal fitting for force transmission and a structure that does not impair the deformation characteristics of the T-shaped metal fitting 1 and the L-shaped metal fitting 6 used.

The T-shaped fitting 1 and the L-shaped fitting 6 used in the present invention can satisfy the strength and the deformation characteristics if the dimensions and the materials are appropriately selected. It is also possible to manufacture by cutting out or welding, and it is also possible to manufacture by casting.

Also, the bolts and nuts need to be conventional high strength bolts and nuts.

Comparing the weight of the web portion of the present invention with that of the T-shaped metal fitting only, assuming that the length of the web portion of the metal fitting is L and the thickness of the web portion is t, (1) the embodiment of the present invention (first embodiment) Figure).

Weight of the web of the joining metal fitting = width x specific gravity x L x t (2) In the case of the conventional technique (Fig. 6).

The weight of the web portion of the T-type joint fitting = width × specific gravity × 2 × L × t That is, the weight of the present invention is 1/2 and much lighter.

Further, in the present invention, the number of bolts in the web portion of the joining metal fitting is half that of the prior art joining metal fitting of FIG.

The weight of each metal fitting member is light, making it suitable for work in high places.

And so on.

EFFECTS OF THE INVENTION Since the composite welding metal fitting of the joint portion of the non-welding architectural column and beam according to the present invention is configured as described above, the number of bolts of the web portion of the metal fitting is half, and the cross section of the metal fitting is reduced. It is easy to reduce the loss rate.

In addition, the weight of the joint fitting is reduced, the method for attaching the joint fitting is simplified, and the method for manufacturing the joint fitting can be simplified.

[Brief description of drawings]

FIG. 1 is a side view of a composite joint fitting of a joint portion between a column and a beam, which is an embodiment of the present invention. FIG. 2 is another embodiment of the present invention. FIG. 2 (a) is a plan view and FIG. 2 (b) is a side view. FIG. 3 is another embodiment of the present invention. FIG. 3 (a) is a plan view and FIG. 3 (b) is a side view. 4 (A), (B), (C), and (D) are side views of conventional various types of joining fittings. FIG. 5 shows the conventional type fitting (A) shown in FIG.
It is a graph which showed the deformation characteristic of (B), (C), and (D). FIG. 6 is a side view of a conventional column-beam joint. 1 ... T-type fitting, 2 ... column, 3 ... beam, 4 ... flange of T-type fitting, 5 ... web of T-type fitting, 6
...... L-shaped fittings, 7 ...... High-strength bolts and nuts, 8 ・ ・ ・
… Flange of L-shaped fitting, 9 …… Web of L-shaped fitting, 10… Conventional T-shaped fitting,

Claims (1)

(57) [Claims] 1. A composite joining structure in which a flange surface of an L-shaped fitting is superposed on a flange surface of a T-shaped fitting, and an H-shape is provided between the web of the T-shaped fitting and the web of the L-shaped fitting. A non-welded construction characterized in that the flange portion of a beam of shaped steel is fixed to a three-layer member sandwiched between high-strength bolts and nuts to form a beam unit, which is attached to a column portion. A composite joint fitting for joints between columns and beams for objects.