JP4086126B2 - Structural design method for buildings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a housing structure planning support method capable of determining the strength of a structural material using a computer when designing a house.
[0002]
[Prior art]
In the conventional shaft construction method, on-site workers such as carpenters processed pillars and horizontal members to the specified dimensions at the work site. Recently, so-called pre-cut systems have been introduced for the processing of these timbers. In the pre-cut factory, the timber is processed in advance, the processed timber is transported to the building site, and the timbers are assembled together. In such a pre-cut system, material dimensions and spans of columns and beams are determined according to a frame rule based on experience, and a material with strength higher than necessary is always used.
[0003]
[Problems to be solved by the invention]
The present inventor has an idea that in a precut system, structural analysis is performed using a computer to select columns and horizontal members having optimum strength. Here, as a method for supporting the design of a house by analyzing the structure using a computer, for example, Japanese Patent Laid-Open Nos. 9-316994 and 9-302664 have been proposed. However, this technique relates to a prefabricated house using homogeneous building materials, and is not applicable to a conventional shaft assembling method using wood with different strengths one by one.
[0004]
An object of the present invention is to provide a structural design method for a building that can be obtained as the shape and Young's modulus of the constituent timber from the shape data of the building.
[0005]
[Means for Solving the Problems]
[0006]
[0007]
Claim 1 inputs the shape data of the building, calculates the shape of the structural material necessary for strength by structural calculation from the load applied to the structural material of the building, and the necessary shape for the calculated strength The technical features include a step of rounding up or down to a standard shape of the constituent material, and a step of obtaining a Young's modulus so as to maintain the calculated strength in accordance with the rounding up or down.
[0008]
In claim 1 , the shape data of the building is input, and the shape necessary for strength is calculated by structural calculation from the load applied to the structural material of the building. Then, the Young's modulus is obtained so that the shape is rounded up or down to the standard shape of the constituent material, and the strength calculated according to the rounding up or down is maintained. For this reason, it becomes possible to obtain | require automatically the shape and Young's modulus of a structural material.
[0009]
According to claim 2 , the step of inputting the shape data of the building including the horizontal member and the column, calculating the height of the horizontal member necessary for strength by structural calculation from the load applied to the horizontal member, and the calculation The height required for the strength is rounded up or down to the standard height of the horizontal member, and the Young's modulus is obtained so as to maintain the calculated strength according to the rounding up or down. Is a technical feature.
[0010]
In claim 2, the shape data of the building including the horizontal member and the column is input, and the height of the horizontal member necessary for strength is calculated by structural calculation from the load applied to the horizontal member. Then, the Young's modulus is determined so that the strength calculated according to the height is rounded up or down to the standard height of the horizontal member, and rounded up or down. For this reason, it becomes possible to obtain | require automatically the height and Young's modulus of a horizontal member.
[0011]
Claim 3 inputs the shape data of the building including the horizontal member and the column, calculates the height and Young's modulus of the horizontal member necessary for strength by structural calculation from the load applied to the horizontal member. The technical feature is to correct the height and Young's modulus of the horizontal member.
[0012]
In claim 3 , the shape data of the building including the horizontal member and the column is input, and the height and Young's modulus of the horizontal member necessary for strength are calculated from the load applied to the horizontal member by structural calculation. Next, correct the height of the horizontal member and Young's modulus. For this reason, it is possible to automatically obtain the height and Young's modulus required for the horizontal member, and align the calculated heights of the separate horizontal members in units of sections and can actually build the horizontal member. Can be obtained.
[0013]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the height of the horizontal member and the Young's modulus for each section are corrected to the height of the highest horizontal member in the section to be corrected. It is a technical feature that the height of the material is made uniform and the Young's modulus is reduced within a range in which the required strength can be obtained with respect to the horizontal member having the increased height.
[0014]
In the invention of claim 4 , the height of the horizontal member and the Young's modulus for each section are corrected by changing the height of the other horizontal member to the height of the highest horizontal member in the section to be corrected. Align. For this reason, the calculated heights of the horizontal members can be arranged in units of sections, and the height of the horizontal members that can actually be constructed can be obtained. On the other hand, the Young's modulus is lowered within a range in which the required strength can be obtained with respect to the horizontal member having a high height. For this reason, it becomes possible to utilize efficiently a timber with a low Young's modulus.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. In this embodiment, a house is designed while inputting house specifications and shape data on a screen of a personal computer (hereinafter referred to as a personal computer), and at the same time, strength of beams, columns, and foundations is checked. First, a procedure for inputting house specification data and shape data into a personal computer and a design process will be described with reference to flowcharts of FIGS. Here, FIG. 1 is a plan view of the first floor of the house to be designed, FIG. 2 is a plan view of the second floor, FIG. 3 is a plan view of the first floor, and FIG. 4 is a plan view of the second floor.
[0016]
FIG. 5 shows a main routine for performing the structural design method for a building according to the first embodiment. First, after initial conditions are input in S100, position data such as columns and beams are processed to complete the initial condition setting. Subsequently, in S200, the horizontal load such as seismic force and wind pressure is examined, the long-term axial force is calculated from the load area and design load of each column (S300), and the short-term axial force of each column due to snow / horizontal force (S400). ) Is calculated.
[0017]
Next, in S500, a section is selected. In the present embodiment, the section means a room division surrounded by a horizontal member. In the next step S800, correction is performed to increase the beam formation as necessary for the large beams in the section selected in step S500.
[0018]
Then, in S900, when the beam formation is increased due to the above-described process and the height of the horizontal member varies, the process of aligning the height in the section is performed. Thereafter, it is determined whether there is an unselected section (S1000). If there is an unselected section (S1000: Yes), the process returns to S500, selects an unchecked section, and performs the same processing. Proceed. When the height of the horizontal member is corrected for all the sections (S1000: No), the main routine is terminated.
[0019]
Here, the initial condition setting in S100 described above will be described in more detail with reference to FIG. 6 showing a subroutine of the processing. In S110, the house design / property information is input. Here, information such as the type of roof necessary for calculating the load and the heavy objects to be stored is input. Subsequently, in S120, the data of the maps shown in FIGS. 1 and 2 are input. As the data of this map, data generated by a precut system in order to precut the timber for the house can be used.
[0020]
Subsequently, in S130, an assumed load such as a fixed load and a loaded load for each layer (floor) is set. Fixed load is the weight of the building such as pillars and beams that make up the building. Therefore, these loads are totaled depending on the constituent materials. The loaded load is the weight of an object or a person stored in the building. Here, in a two-story house, a fixed load and a loaded load on the first layer (floor) are assumed, and a fixed load and a loaded load are similarly assumed on the second layer (floor).
[0021]
When the setting of the assumed load in each layer (floor) in S130 is completed, the design load for each layer (floor) is calculated in S140. A load obtained by adding up the fixed load and the loaded load in each layer (floor) is a design load, and a structure calculation is performed based on this information data to calculate material arrangement coordinate data.
[0022]
Next, in S150, the position data is converted. First, the coordinate position data and wall magnification αi of each layer (floor) and each bearing wall are converted into (Xi, Yi, Xj, Yj, αi). That is, as shown in FIG. 12, the coordinates (Xi, Yi, Xj, Yj) of both ends of the bearing wall W are obtained, and the bearing wall W can be specified by the coordinates. Similarly, normal wall (outer wall / inner wall) position data is converted to (Xi, Yi, Xj, Yj), column position data and width angle d, and grade number n are changed to (Xi, Yi, d, n). Conversion, and finally, the beam position data, width d, formation h, and grade number n are converted into (Xi, Yi, Xj, Yj, d, h, n). When the conversion of all the position data is completed, the initial condition setting (S100) subroutine ends.
[0023]
Next, the examination for the horizontal load in S200 in FIG. 5 showing the main routine will be described with reference to the flowchart of FIG. 7 showing the subroutine of the processing. In S210, the effective wall amount and wall strength for each layer (floor), between beams, and in the direction of the beam are calculated. Here, the load-bearing wall is a wall body that opposes the vertical force due to the horizontal force, the building's own weight, and the like, and the length of each load-bearing wall is multiplied by the wall magnification, and the total is the effective wall amount. The wall strength is obtained by multiplying the effective wall amount by 200 kgf / m. Next, the required wall quantity for the seismic force / wind pressure is calculated (S220). Here, adjustment is made so that the ratio of the effective wall amount to the required wall amount is 1.0 or more, and the examination of the wall amount is completed.
[0024]
In S230, the seismic force and wind pressure are calculated, and subsequently in S240, the ratio of the proof stress to the horizontal force in the seismic force / wind pressure is adjusted to 1.0 or less, and the study of the proof strength is completed. Next, the interlayer deformation angle and the rigidity are examined in S250. In order for the outer wall material to follow the structure and not fall off, an interlayer deformation angle of 1/200 or less and a rigidity of 0.6 or more are required. In particular, in a two-story wooden building, the interlayer deformation angle is 1/120 or less. In this step, the interlayer deformation angle is adjusted to be 1/200 (1/120) or less and the rigidity is 0.6 or more, and if confirmed, the process proceeds to the next step.
[0025]
In S260, the eccentricity is examined. The deviation between the center of gravity of each floor plane and the center of rigidity of the bearing wall is the eccentricity, and if the eccentricity is 0.15 or less, the building has a good balance of the bearing walls. In this step, if adjustment is made so that the eccentricity is 0.15 or less, this step is terminated, and the flow proceeds to S270.
[0026]
In S270, the retained horizontal strength is examined. Here, the horizontal strength in the final state is the retained horizontal strength. Adjustment is made so that the ratio of the retained horizontal strength of each layer (floor) to the required retained horizontal strength of each layer (floor) is 1.0 or less, and if it is confirmed, the process proceeds to the next step.
[0027]
Finally, the joint strength is examined in S280. Here, two conditions are examined: prevention of pull-out of foundation-column and beam-column, and prevention of blow-up of girder-coil. That is, for the prevention of the pull-out of the base-column and the beam-column, adjustment is made so that the ratio of the short-term allowable yield strength of the metal to the joint pull-out force due to the horizontal force is less than 1.0. Moreover, about prevention of blowing up of a girder-drum, it adjusts so that the ratio of the resistance force with respect to blowing up with respect to the wind pressure concerning a rafter may become less than 1.0. When the process in S280 is completed, the subroutine for the study on the horizontal load (S200) is terminated.
[0028]
Next, S800 (automatic beam designation and correction) shown in FIG. 5 showing the main routine will be described with reference to the flowchart of FIG. Here, the processing of the section A surrounded by the large beams (horizontal members) O1, O2, O3, and O4 in FIG. First, an unselected large beam in the section A is selected in step S810. Here, if the large beam O1 is selected, then the span L is confirmed in S820. For example, when there are lower pipe columns H2 and H3 between the through columns H1 and H4 to which the large beam O1 is passed in FIG. 4, the spans are the span L1 between the through column H1 and the tube column H2, and the tube column H2−. The span L2 between the pipe pillars H3 and the span L3 between the pipe pillar H3 and the through pillar H4 are confirmed. Furthermore, since the pipe column H5 is hung on the large beam O1 in FIG. 4, the load span is the distance between the tube column H3 and the tube column H5 and the distance between the tube column H5 and the tube column H2. become. Here, the pipe column existed, but the load span is confirmed in the same manner when there are beams, joists, etc. on the horizontal member. When this confirmation is completed, the process moves to the next S830.
[0029]
In S830, the load type applied to the girder is selected. As will be described later, the load type is determined by the type and span of the horizontal member on the girder. When the selection of the load format is completed, the beam formation is calculated from the load format and the beam verification formula (S840). There are four types of beam formations: a beam formation hb by bending, a beam formation hs by shearing, a beam formation h500 by deflection L / 500, and a beam formation h5 by deflection 5 mm.
[0030]
In S850, it is determined whether or not there is an unselected large beam in the section. If there is an unselected large beam (S850: Yes), the process returns to S810 and the same processing is repeated. If all the beams are selected (S850: No), the automatic beam designation and correction process in S800 is terminated.
[0031]
The selection of the load type applied to the large beam in S830 described above will be described with reference to the flowchart of FIG. 9 showing the subroutine of the processing. First, in S831, it is determined whether a beam or a column exists on the designated large beam. When a beam or a column exists (S831: Yes), the process proceeds to S838, and it is determined that the designated large beam receives only a concentrated load.
[0032]
On the other hand, if there is no beam or column (S831: No), the process proceeds to S832, and it is determined whether the designated large beam is covered with joists and a beam or column is present. If the joist is spanned and a beam or a column is present (S832: Yes), the process proceeds to S839, where it is determined that the designated large beam has received an equally distributed load and a concentrated load.
[0033]
Here, when the joist is not applied to the large beam and the beam or the column does not exist (S832: No), the process proceeds to S833, and it is determined whether or not there is a joist on the designated large beam. If there is a joist (S833: Yes), the process proceeds to S837, where it is determined that the designated girder receives only the evenly distributed load.
[0034]
If there is no joist on the designated beam (S833: No), the process proceeds to S834 to determine whether there is an inner wall on the beam. If there is an inner wall (S834: Yes), the process proceeds to S837 in the same manner as S833, and it is determined that the designated girder receives only the evenly distributed load.
[0035]
If there is no inner wall (S834: No), it will progress to S835 and it will be determined whether there exists an outer wall on a girder. If there is an outer wall (S835: Yes), the process similarly proceeds to S837, and it is determined that the designated girder receives only the evenly distributed load. If there is no outer wall on the girder (S835: No), the process proceeds to S836, where it is determined that the girder is on the floor, and the process proceeds to S837, where it is determined that the girder receives only the evenly distributed load. The load type determination (S830) is completed by the above processing.
[0036]
Here, the load (kg / m) applied to the span L of the large beam is calculated in the load type determination processing in S838, S839, and S837 described above. Here, when it is determined that only the evenly distributed load is present (S837), the equally distributed load ω is calculated by the following equation.
[Expression 1]
ω (kg / m) = W (kg / m2) x p (m) + (wall unit load) x (height)
Here, W represents a design load, and p represents a beam burden width. Although the calculation formula is shown only for the evenly distributed load ω, the load is calculated based on a predetermined calculation formula in the case of only the concentrated load in S838 described above and also in the case of the uniformly distributed load and concentrated load in S839.
[0037]
The beam forming calculation process in S840 described above with reference to FIG. 8 will be described with reference to FIG. 10 showing a subroutine of the process. First, it is verified whether the designated beam can withstand the load (S842). The verification formula of the beam is determined by the load type, but the verification when it is determined that the girder receives only the evenly distributed load will be described. In the present embodiment, three types of wood are used: wood having a standard Young's modulus (100 kg / cm 2), wood having a low Young's modulus (80 kg / cm 2), and wood having a high Young's modulus (120 kg / cm 2). First, the beam hb (mm) of a large beam that can withstand bending stress is obtained from the following equation. Here, the degree of stress is a load per unit area.
[Expression 2]
hb = (3ωL2 / 4bfb) 1/2
Here, L (m) is the span, b (mm) is the width of the large beam, and fb (kg / cm @ 2) is the allowable bending stress.
[0038]
The beam hs (mm) of a large beam that can withstand the shear stress is obtained from the following equation.
[Equation 3]
hs = 1.5ωL / 2bfs
fs (kg / cm @ 2) represents the allowable shear stress level.
[0039]
On the other hand, the beam composition h500 (mm) which does not bend more than L / 500 bend amount (deflection amount per unit length) is obtained from the following equation.
[Expression 4]
h500 = (25 × 10 6 ΩL 3/32 Eb) 1/3
E (kg / cm 2) represents a Young's modulus, and in this embodiment, calculation is performed with a standard Young's modulus (100 kg / cm 2).
[0040]
On the other hand, the beam h5 (mm) having a deflection amount of 5 mm or less (absolute deflection amount) is obtained from the following equation.
[Equation 5]
h5 = (ωL4 / 32Eb) 1/3
[0041]
The above values are values given from the cross-sectional performance data and the intensity classification table. If the load consists of equally distributed loads and concentrated loads, or only concentrated loads, the same processing is performed for each span of the large beam, and the largest beam within each span is determined. The process will proceed as a necessary beam.
[0042]
In S842, it is determined whether or not the largest beam formation among the four types described above is smaller than the height (beam formation) H (mm) of the cross section of the large beam designated in advance. If it is small (S842: Yes), it is judged whether wood having a Young's modulus of 80 kg / cm2 lower than the standard Young's modulus (100 kg / cm2) can be used because the strength of the large beam is sufficient (S843). That is, even when wood of 80 kg / cm 2 can satisfy the deflection amount of L / 500 and the deflection amount of 5 mm or less (S843: Yes), 80 kg / cm 2 is set as the Young's modulus of the large beam (S844). . On the other hand, if it cannot be satisfied (S843: No), the process is terminated with the standard 100 kg / cm 2 set.
[0043]
On the other hand, if any of the four types of beams in S842 is larger than the height H of the cross section of the beam (S842: No), the large beams are displayed by color on a personal computer monitor (not shown) (S845). ). For example, if two types of beam formation hb by bending and beam formation hs by shearing are larger than the height H of the cross section of the beam, the beam formation hb by bending is displayed in purple on the personal computer screen, and the beam formation hs by shearing is displayed. Is displayed in red. Alternatively, if the beam formation h500 with the deflection L / 500 and the beam formation h5 with the deflection of 5 mm are larger than the height H of the cross section of the beam, the beam formation h500 with the deflection L / 500 is displayed in pink, and the beam with the deflection of 5 mm The result h5 is displayed in yellow to inform the operator that there is an abnormality.
[0044]
Next, it is judged whether the required strength can be satisfied by using wood having a Young's modulus of 120 kg / cm 2 higher than the standard Young's modulus (100 kg / cm 2) (S846). That is, when using a wood having a Young's modulus of 120 kg / cm 2, when the deflection amount of L / 500 and the deflection amount of 5 mm or less can be satisfied (S846: Yes), the Young's modulus of the large beam is 120 kg / cm 2. It sets (S840). On the other hand, if it cannot be satisfied (S846: No), the beam formation is ranked up (S852). For example, when 150 mm is designated as the beam formation of the large beam, a beam formation of 180 mm higher by one rank is designated. That is, since the beam formation is set in steps of 30 mm, a beam formation 30 mm higher is adopted. Thereafter, the process returns to S842, and it is determined whether the beam formation having the largest value among the four types of beam formation is smaller than the beam formation higher by one rank. Note that the width b of the large beam uses a unified value with the column in the conventional frame assembling method, and therefore, when the strength is insufficient, only the beam formation is adjusted.
[0045]
Next, S900 (height adjustment) of the main routine shown in FIG. 5 will be described with reference to FIG. 11 showing a subroutine of the processing. In the height alignment process of S900, after correcting the beam formation of the large beam in S800 described above, the height of the horizontal member in the section is aligned in this step. First, in S910, it is determined whether or not there is a variation in the height of the horizontal member in the section. Here, for example, the height of the large beams O1 and O2 constituting the section A shown in FIG. 4 is 150 mm, but the height of the large beams O3 and O4 is 180 mm and higher than the large beams O1 and O2 (S910: Yes). The process proceeds to the next S920.
[0046]
In S920, a large beam having a low beam is selected. Here, the description will be continued assuming that the large beam O1 is selected. Next, in step S930, the beam formation of the selected large beam O1 is aligned with the beam formation (180 mm) of the high large beams O3 and O4. And it is judged whether the wood of Young's modulus lower than the set Young's modulus can be used (S940). That is, as a result of increasing the beam formation, if the amount of deflection of L / 500 and the amount of deflection of 5 mm or less can be satisfied even with wood having a low Young's modulus rank (S940: Yes), the Young As a rate, a low-rank Young's modulus is set (S950). On the other hand, when it cannot be satisfied (S940: No), the set Young's modulus is used. Then, in S960, it is determined whether or not all the low beams are selected. When the selection is not completed (S960: No), the process returns to S920. On the other hand, when the selection is completed (S960: Yes). Then, the height alignment process ends. This makes it possible to obtain structural data that can be actually built as well as satisfying the required strength. In addition, it is possible to efficiently use wood having a low Young's modulus. When the heights of the horizontal members in the section are all equal in S910 (S910: No), the process in S900 is finished and the process proceeds to the next step 1000.
[0047]
The design is completed by proceeding to the sections B, C, and D in FIG. 4 showing the floor plan of the second floor, and by performing the above processing for each section on the lower first floor. In the modification of the beam formation, after the upper layer is completed in consideration of the effect after the modification, the load is calculated based on the modified beam formation, and the process for the lower layer is advanced. Here, the beam formation of the large beams is aligned, but the above processing can also be used when aligning the beam formation of the horizontal member.
[0048]
Then, the structural design method of the building which concerns on 2nd Embodiment of this invention is demonstrated. In the first embodiment described above, the beam formation of the large beam is designated in advance. On the other hand, in the second embodiment, the beam formation of a large beam having a required strength is automatically calculated. Since the processing of the second embodiment is the same as that of the first embodiment except for the beam formation calculation processing, only the beam formation calculation processing will be described with reference to FIG.
[0049]
First, in S1830 of FIG. 13 showing the beam formation calculation processing, the beam formation hb (mm) of the large beam that can withstand the bending stress level, the beam formation hs (mm) of the large beam that can withstand the shearing stress level, as in the first embodiment, A beam h500 (mm) with a deflection amount of L / 500 (a deflection amount per unit length) and a beam h5 (mm) with a deflection amount of 5 mm or less (absolute deflection amount) are obtained.
[0050]
Next, it is determined whether or not a beam-made wood having a standard value lower than the highest beam value among the above four values can be used (S1833). That is, standard values in increments of 30 mm, such as 150 mm, 180 mm, and 210 mm, are used as the horizontal members, and it is determined whether or not beam-made wood that has been cut down to this standard value can be used. For example, the beam hb of the large beam that can withstand the bending stress is 122 mm, the beam hs of the large beam that can withstand the shear stress is 134 mm, the beam h500 having the deflection amount of L / 500 is 156 mm, and the beam h5145 mm having the deflection of 5 mm is calculated. When the timber with the highest deflection amount of L / 500 is 156 mm, the lowest Young's modulus (120 kg / cm 2) is used even when the closest standard value of 150 mm is used. Is used, it is determined whether the required strength can be obtained (S1833). When the required strength cannot be obtained (S1833: No), the process proceeds to S1842, where a rounded beam (180 mm in this case) is set, and a Young's modulus corresponding to the rounded beam is set (S1844).
[0051]
On the other hand, when the required strength is obtained (S1833: Yes), in S1838, the standard value closest to the highest beam among the above four values and the Young's modulus at the standard value are displayed. For example, when the beam length h500 having the highest deflection amount of L / 500 is 156 mm, the closest standard values, 150 mm and 180 mm, are displayed, and the Young's modulus (for example, 120 kg / cm 2) at the 150 mm is 180 mm. The Young's modulus (for example, 80 kg / cm 2) is displayed.
[0052]
In response to this display, when the operator gives an instruction to raise the large beam to the higher height side (S1840: Yes), the rounded beam (180 mm in this case) is set (S1842), and the Young A rate of 80 kg / cm @ 2 is set (S1844). On the other hand, when the operator instructs the lowering of the large beam to the lower side (S1850: Yes), the lower beam is formed (here, 150 mm) (S1852), and the Young's modulus is 120 kg / cm2. Is set (S1854). In the second embodiment, there is an advantage that it is not necessary to specify the beam formation of the large beam in advance. In addition, it is possible to instruct whether to raise or lower the height of the girder according to the Young's modulus of the wood to be used.
[0053]
Subsequently, a structural design method for a building according to a third embodiment of the present invention will be described. In the second embodiment described above, the beam formation of the large beam is selected. On the other hand, in the third embodiment, the beam formation of the large beam is automatically selected. Since the process of the third embodiment is the same as that of the first embodiment except for the beam formation calculation process, only the beam formation calculation process will be described with reference to FIG.
[0054]
First, in S1830 of FIG. 14 showing the beam formation calculation processing, the beam formation hb (mm) of the large beam that can withstand the bending stress level, the beam formation hs (mm) of the large beam that can withstand the shearing stress level, as in the first embodiment, A beam h500 (mm) with a deflection amount of L / 500 (a deflection amount per unit length) and a beam h5 (mm) with a deflection amount of 5 mm or less (absolute deflection amount) are obtained.
[0055]
Next, if the higher Young's modulus (120 kg / cm 2) is used as in S1833 of the second embodiment, it is determined whether the required strength can be obtained even if the beam is cut down (S1833). When the required strength cannot be obtained (S1833: No), the process proceeds to S1842, where the rounded beam is set, and the Young's modulus corresponding to the rounded beam is set (S1944).
[0056]
On the other hand, if the required strength can be obtained even if it is cut down (S1833: Yes), it is determined whether the girder is a girder straddling two sections (S1840). For example, in FIG. 4, since the large beam O1 belongs only to the section A (S1840: No), the process proceeds to S1842, the rounded beam formation is set, and the Young's modulus corresponding to the rounded beam formation is set (S1944). ). On the other hand, in FIG. 4, since the large beam O4 belongs to the section A and the section B (S1840: Yes), the process proceeds to S1852, where the lower beam is set and the Young's modulus corresponding to the lower beam is set. (S1954). In other words, a large beam straddling a plurality of sections has a greater effect when the beam formation is increased, so that a lower beam formation is set by increasing the Young's modulus.
[0057]
In the third embodiment, wood with a low Young's modulus can be used, and wood with a high Young's modulus can be used efficiently.
[Brief description of the drawings]
FIG. 1 is a plan view of a first floor of a house to be designed.
FIG. 2 is a plan view of the second floor of a house to be designed.
FIG. 3 is a plan view of the first floor of a house to be designed.
FIG. 4 is a plan view of the second floor of a house to be designed.
FIG. 5 is a flowchart showing a main routine of the building structural design method according to the first embodiment;
6 is a flowchart showing a subroutine of initial condition setting processing in FIG.
7 is a flowchart showing a subroutine of examination processing for a horizontal load in FIG. 5. FIG.
FIG. 8 is a flowchart showing a subroutine for automatic designation and correction processing of a large beam in FIG. 5;
FIG. 9 is a flowchart showing a subroutine of load format determination processing in FIG.
FIG. 10 is a flowchart showing a beam formation calculation subroutine in FIG. 8;
FIG. 11 is a flowchart showing a subroutine of height alignment processing in FIG. 5;
FIG. 12 is an explanatory diagram showing a change in position data of the bearing wall.
FIG. 13 is a flowchart showing a subroutine for beam formation calculation processing according to the second embodiment.
FIG. 14 is a flowchart showing a subroutine for beam formation calculation processing according to the third embodiment.
[Explanation of symbols]
O1, O2, O3, O4 Large beam H1, H4 Through pillar H2, H3, H5 Pipe pillar W Bearing wall A, B, C, D Section

Claims (4)

  Enter the building shape data, calculate the shape of the structural material necessary for strength by structural calculation from the load applied to the structural material of the building, and the shape necessary for the calculated strength A method for designing a structure of a building, comprising: a step of rounding up or down to an upper shape; and a step of obtaining a Young's modulus so as to maintain the calculated strength in accordance with the rounding up or down.   Input the shape data of the building including the horizontal members and columns, calculate the height of the horizontal members necessary for strength by structural calculation from the load applied to the horizontal members, and necessary for the calculated strength A construction comprising: a step of raising or lowering a height to a standard height of a horizontal member; and a step of obtaining a Young's modulus so as to maintain a calculated strength according to the raising or lowering. Structure design method for objects.   Enter the shape data of the building including the horizontal members and pillars, calculate the height and Young's modulus of the horizontal members necessary for strength by structural calculation from the load applied to the horizontal members. A structural design method for a building, wherein the height and Young's modulus are corrected. The height of the horizontal member and the Young's modulus for each section are corrected by aligning the height of the other horizontal member with the height of the highest horizontal member in the section to be corrected. 4. The structural design method for a building according to claim 3 , wherein the Young's modulus is reduced within a range in which a required strength can be obtained with respect to a horizontal member having a high height.

Images