JP2019138086A - Foundation design system - Google Patents

Abstract

To provide a foundation design system capable of designing an optimal foundation cross section according to a load condition of a building.SOLUTION: A foundation design device 10 designs a foundation of a unit type building which is constituted of a plurality of building units including a column and a beam and connected with each other. A control portion 11 of the foundation design device 10 obtains design data of the building provided on the foundation and calculates load applied to the foundation from the column of the building on the basis of the obtained design data of the building. Then, cross section design of the foundation is performed on the basis of the calculated load.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a basic design system.

  As this type of system, Patent Document 1 discloses a system for designing a cross section of a foundation of a unit type building. In the system of Patent Document 1, an axial force applied to the foundation from a column of a building unit is input by a user, and a cross-sectional design is performed based on the input axial force. Specifically, in the system, when the axial force is input, a list of prepared axial forces is displayed on the display, and the user selects an appropriate axial force from the list. An axial force is input.

JP 2004-62269 A

  By the way, in the system of the above-mentioned patent document 1, since the user selects and inputs one of the axial forces from the list of axial forces, for example, an excessive axial force is input rather than actually applied to the foundation from the building. (Setting) is assumed. In that case, since the cross-sectional design of the foundation is performed based on the excessive axial force, an excessive quality foundation is designed as the foundation of the building. That is, in the system of Patent Document 1, it is assumed that it is difficult to design a foundation cross section according to the actual load situation of the building, and there is still room for improvement in that respect.

  This invention is made | formed in view of the said situation, and makes it the main objective to provide the foundation design system which can design the optimal foundation cross section according to the load condition of a building.

  In order to solve the above-mentioned problems, a foundation design system according to a first aspect of the present invention is a foundation design system for designing a foundation of a unit type building constructed by connecting a plurality of building units having columns and beams to each other. The building is provided by installing the pillar of the building unit on the foundation, and an acquisition unit that acquires the design data of the building, and the design of the building acquired by the acquisition unit A load calculating means for calculating a load acting on the foundation from the column based on the data; and a cross-sectional design means for performing a cross-sectional design of the foundation based on the load calculated by the load calculating means. To do.

  According to the present invention, design data of a unit type building provided on a foundation is acquired, and based on the acquired building design data, a load acting on the foundation from a pillar installed on the foundation in the building (in other words, The fulcrum reaction force) is calculated. Then, based on the calculated load from the column, the cross section of the foundation is designed. In this case, since the cross-section design of the foundation can be performed according to the load actually acting on the foundation from the pillar of the building, the optimum foundation cross-section according to the load condition of the building can be designed.

  The foundation design system according to a second aspect of the present invention is the foundation design system according to the first aspect, wherein the foundation is a fabric foundation having a footing portion embedded in the ground and a rising portion exposed upward from the footing portion and exposed from the ground. The load calculating means calculates a vertical load acting on the foundation from the pillar, and calculates a ground pressure acting on the bottom of the footing portion from the ground based on the vertical load calculated by the load calculating means. Means for determining the width of the footing part based on the calculated contact pressure.

  According to the present invention, the vertical load acting on the foundation is calculated from the column of the building, and the ground pressure acting on the bottom of the footing portion of the foundation is calculated from the ground based on the calculated vertical load. In designing the cross section of the foundation, the width of the footing portion is determined based on the calculated contact pressure. For example, the footing width is determined so that the contact pressure is equal to or less than the ground bearing capacity. In this case, the foundation cross section can be designed with an optimum footing width corresponding to the building load condition (vertical load condition).

  In the foundation design system of the third invention, in the second invention, in the foundation, a portion including the rising portion and extending in the entire vertical direction of the foundation is a foundation beam portion, and the load calculating means A horizontal load acting on the foundation is calculated from a column, and a stress generated in the foundation beam portion is calculated based on the horizontal load calculated by the load calculating means when the horizontal load acts on the foundation. Stress calculation means for calculating as stress is provided, and the cross-section design means determines a base beam cross section including a cross-sectional shape of the foundation beam portion based on the foundation beam stress calculated by the stress calculation means.

  According to the present invention, the horizontal load acting on the foundation is calculated from the pillar of the building, and based on the calculated horizontal load, the stress (foundation beam stress) generated in the foundation beam portion when the horizontal load is applied to the foundation is calculated. Is done. When the cross section of the foundation is designed, the cross section of the foundation beam portion (the basic beam cross section) is determined based on the calculated foundation beam stress. For example, the foundation beam cross section is determined so that the foundation beam stress is equal to or less than the allowable yield strength of the foundation beam portion. In this case, it is possible to obtain an optimum foundation beam section according to the building load situation (horizontal load situation).

  According to a fourth aspect of the present invention, in the third aspect of the present invention, in the third aspect of the invention, the cross section of the foundation beam determined by the cross section design means includes a cross-sectional shape of the foundation beam portion, and a reinforcing bar provided in the foundation beam portion. Information is included.

  According to the present invention, it is possible to determine not only the cross-sectional shape of the foundation beam part but also the reinforcing bars (bar arrangement) provided in the foundation beam part according to the load state of the building. In addition, as information of the reinforcing bar in the foundation beam part, information such as the diameter, arrangement, number of reinforcing bars, and the like can be given.

The figure which shows schematic structure of a foundation design apparatus. The longitudinal cross-sectional view which shows the cross-sectional structure of a foundation. The perspective view which shows the outline of a unit type building. The figure for demonstrating the cross-section data memorize | stored in the basic cross-section database. The flowchart which shows a basic design process. (A) is a top view which shows the planar shape of a foundation, (b) is a top view which shows the state by which the foundation was divided into the several base area | region. The flowchart which shows a basic cross-section design process.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a foundation design apparatus for designing a foundation of a unit type building is embodied. FIG. 1 is a diagram showing a schematic configuration of the basic design apparatus.

  As shown in FIG. 1, the foundation design apparatus 10 is composed of a personal computer and has a CAD program for designing a building or foundation. The basic design apparatus 10 includes a control unit 11, a storage unit 12, an operation unit 13, and a display unit 14, and a storage unit 12, an operation unit 13, and a display unit 14 are connected to the control unit 11. The basic design apparatus 10 corresponds to a basic design system.

  The control unit 11 performs basic design processing for performing basic design. The storage unit 12 stores various types of information necessary for the basic design process, and the control unit 11 performs the basic design process based on the various types of information stored in the storage unit 12. The operation unit 13 is used to input various information such as information necessary for the basic design process, and includes a keyboard and a mouse. The display unit 14 displays various types of information related to the basic design process, and has a display.

  Next, the structure of the foundation designed by the foundation design apparatus 10 will be briefly described with reference to FIG. FIG. 2 is a longitudinal sectional view showing a sectional configuration of the foundation.

  As shown in FIG. 2, the foundation 21 is a reinforced concrete fabric foundation. The foundation 21 has a footing part 22 embedded in the ground, and a rising part 23 that rises upward from the footing part 22 and is exposed on the ground. In the foundation 21, the footing part 22 extends in the horizontal direction, and the rising part 23 extends in the vertical direction.

  Of the foundation 21, the portion including the rising portion 23 and extending over the entire height direction (vertical direction) of the foundation 21 is a foundation beam portion 24. A reinforcing bar is embedded in the foundation beam portion 24. As the reinforcing bars, the foundation beam portion 24 is provided with a plurality of horizontal reinforcing bars 26 to 28 extending in the longitudinal direction of the foundation 21, and ribs 29 extending in the vertical direction and connected to the horizontal reinforcing bars 26 to 28. . The plurality of horizontal reinforcing bars 26 to 28 include an upper end muscle 26, a lower end muscle 27, and an abdominal muscle 28. A plurality of ribs 29 are arranged at predetermined intervals in the longitudinal direction of the foundation 21.

  In the footing part 22, similarly to the foundation beam part 24, a reinforcing bar is embedded. The footing part 22 is provided with a pair of base force distribution bars 31 extending in the longitudinal direction of the foundation 21 and base bars 32 extending in the width direction of the footing part 22 and connected to the base force distribution bars 31 as reinforcing bars. It has been. A plurality of base muscles 32 are arranged at predetermined intervals in the longitudinal direction of the foundation 21.

  Next, the unit type building installed on the foundation 21 will be briefly described with reference to FIG. FIG. 3 is a perspective view showing an outline of a unit type building.

  As shown in FIG. 3, the unit building 40 is configured by combining a plurality of rectangular parallelepiped building units 41. In the example of FIG. 3, the unit type building 40 is a two-story building, and a plurality of building units 41 are arranged on each of the first floor part and the second floor part. The building unit 41 includes four columns 42 arranged at the four corners thereof, and four ceiling beams 43 and floor beams 44 that connect the upper end and the lower end of each column 42, respectively. In the building unit 41, a rectangular parallelepiped frame 45 is formed by the pillars 42, the ceiling beams 43, and the floor beams 44, and ceiling materials, floor materials, wall materials, roof materials, and the like are attached to the frames 45. Moreover, in the unit type building 40, the frame body 45 (frame) is comprised by the frame 45 of each building unit 41. FIG.

  The unit building 40 is installed on the foundation 21. In this case, in the unit type building 40, each building unit 41 of the first floor portion is installed on the foundation 21. Specifically, the pillars 42 of the respective building units 41 are respectively installed on the foundation 21 (the rising portion 23), and thereby each building unit 41 is installed on the foundation 21. Therefore, in the unit type building 40, the load of the building 40 is transmitted onto the foundation 21 through the pillar 42 of the building unit 41.

  Next, the design process for the foundation 21 performed by the foundation design apparatus 10 (control unit 11) will be described. Here, it is assumed that the design is performed on the foundation 21 of the unit building 40 (hereinafter referred to as the building 40 for short), and the design data of the building 40 is stored in the storage unit 12 in advance. .

  The control unit 11 designs the planar shape of the foundation 21 as the foundation design process. That is, the control unit 11 designs (creates) a plan view of the foundation 21, that is, a foundation plan. The control unit 11 acquires design data of the building 40 from the storage unit 12 and designs a plan view of the foundation 21 based on the design data.

  The control unit 11 performs a cross-sectional design of the foundation 21 in addition to a plan view of the foundation 21 as a foundation design process. At the time of cross-sectional design, the control unit 11 first identifies each column 42 of the building 40 installed on the foundation 21 based on the plan view of the foundation 21 and the design data of the building 40 (see also FIG. 6A). The load (fulcrum reaction force) acting on the foundation 21 from these columns 42 is calculated. At this time, the control unit 11 performs a stress analysis of the frame body 47 using, for example, data of the frame body 47 included in the design data of the building 40, and from the pillars 42 to the foundation 21 based on the result of the stress analysis. Calculate the acting load. And the control part 11 performs the cross-section design of the foundation 21 based on the load which acts on the foundation 21 from the calculated column 42. FIG.

  Further, in the basic design apparatus 10, as shown in FIG. 1, a basic cross-section database 17 that stores cross-sectional data (specifically, vertical cross-section data) of the base 21 in the storage unit 12 is constructed. And the control part 11 is supposed to perform the cross-section design of the foundation 21 using the basic cross-section database 17. Hereinafter, the basic cross-sectional database 17 will be described with reference to FIG. FIG. 4 is a diagram for explaining the cross-sectional data stored in the basic cross-sectional database 17.

  As shown in FIG. 4, the basic cross-sectional database 17 stores (registers) cross-sectional data X of the base 21 as cross-sectional data. In addition to the cross-sectional shape (vertical cross-sectional shape) of the foundation 21, the cross-section data X of the foundation 21 includes reinforcing bar information related to the reinforcing bars 26 to 29 provided on the foundation 21. The cross-sectional shape (cross-sectional shape data) of the foundation 21 includes the outer dimensions (cross-sectional dimensions) of the foundation 21. Specifically, the width W (footing width W) of the footing portion 22 in the foundation 21 and the foundation beam portion 24. Dimensions such as height H and width B are included. Note that the height H of the foundation beam portion 24 corresponds to the height of the foundation 21. Further, the reinforcing bar information includes information on the diameter, number, arrangement, and the like of the reinforcing bars 26 to 29, 31, 32.

  The basic cross-section database 17 stores a plurality of cross-section data X having different footing widths W, and stores a plurality of cross-section data X having different cross-sectional shapes (specifically, height H and width B) of the base beam portion 24. Has been. For example, the basic cross-section database 17 stores a plurality of cross-sectional data X having the same footing width W and different cross-sectional shapes of the basic beam portion 24. The basic cross-section database 17 stores a plurality of cross-section data X having different diameters, numbers, and arrangements of the reinforcing bars 26 to 29, 31, 32.

  In the basic cross-section database 17, the cross-section data X can be registered (stored) by operating the operation unit 13.

  Next, the basic design process executed by the control unit 11 will be described based on the flowchart shown in FIG. This process is started based on a process start operation on the operation unit 13.

  As shown in FIG. 5, first, in step S11, design data of the building 40 is read from the storage unit 12 and acquired (corresponding to an acquisition unit). In addition, you may make it acquire the design data of the building 40 not from the memory | storage part 12, but from the exterior of the basic design apparatus 10. FIG.

  In step S12, a plan view of the foundation 21 (hereinafter referred to as the foundation 21K), that is, a foundation plan is created (designed) based on the design data of the building 40. In this case, for example, a basic plan is created based on the outer shape of the building 40, the position of the pillar 42 of the building 40, and the like. FIG. 6A shows the created basic plan. In FIG. 6A, for convenience of explanation, each column 42 of the building 40 (building unit 41) installed on the foundation 21K is also shown. Moreover, in FIG. 6A, the independent foundation 35 is arrange | positioned inside the foundation 21, and the pillar 42 installed on the independent foundation 35 is also shown collectively (FIG. 6B is also the same). ).

  In step S13, based on the design data of the building 40, a load (fulcrum reaction force) acting on the foundation 21K from each column 42 of the building 40 is calculated (corresponding to load calculating means). Specifically, in this step, for each column 42, a vertical load Ft acting on the foundation 21K from the column 42 and a horizontal load Fs acting on the foundation 21K from the column 42 are calculated. The vertical load Ft and the horizontal load Fs calculated for each column 42 are temporarily stored in the storage unit 12.

  In step S14, the foundation 21K is divided into a plurality of areas (hereinafter referred to as the basic area 21a) based on the basic plan created in step S12. FIG. 6B shows a state where the foundation 21K is divided into a plurality of foundation regions 21a. In addition, although the method of division | segmentation of the foundation 21K is arbitrary, it divides | segments so that the pillar 42 may each be located on each foundation area | region 21a.

  Here, in this basic design process, the cross-sectional design of the foundation 21K is performed for each of the divided basic regions 21a. Therefore, in step S15, it is determined which of the basic regions 21a is to be subjected to cross-sectional design, that is, the basic region 21a to be subjected to cross-sectional design. In the following, this basic region 21a is referred to as a target basic region 21a, and in FIG. 6B, the target basic region 21a is shown with a dot hatch.

  In step S16, a basic cross-section design process for performing a cross-section design for the target basic region 21a is performed. Hereinafter, the basic cross-section design process will be described based on the flowchart shown in FIG.

  In the basic cross section design process, as shown in FIG. 7, first, in step S21, a basic cross section is initially set for the target basic region 21a. In this case, for example, the cross-section data X having the smallest cross-section size is extracted from each cross-section data X stored in the basic cross-section database 17, and the extracted cross-section data X is initially set as the basic cross section of the target basic area 21a. Set.

  In steps S22 to S27, a process for determining the width L of the footing part 22 of the target basic region 21a is performed. First, in step S22, a pillar 42 (hereinafter referred to as a pillar 42a) installed on the target basic area 21a is specified, and a vertical load Ft acting on the target basic area 21a is read from the storage section 12 from the pillar 42a. Specifically, since the vertical load Ft acting on the foundation 21K from the column 42 is stored in the storage unit 12 for each column 42 of the building 40 (see step S13), the storage unit 12 operates from the column 42a. The vertical load Ft is read and acquired.

  In step S23, the weight G of the target basic region 21a is calculated. In this case, the weight G of the target basic region 21a is calculated based on the length La of the target basic region 21a and the cross-sectional area of the target basic region 21a (the cross-sectional area of the vertical cross section). Specifically, the volume of the target basic region 21a is obtained by multiplying the length La (see FIG. 6B) of the target basic region 21a by the cross-sectional area, and the weight G of the target basic region 21a is calculated based on the volume. Is calculated.

  Note that the length La of the target base region 21a is obtained based on a plan view of the base 21K. In this case, this length La corresponds to the total length of the center line when, for example, a center line passing through the center in the width direction of the target basic region 21a is assumed. The cross-sectional area of the target basic region 21a is obtained based on the basic cross-section (cross-sectional data X) set in the target basic region 21a.

  In step S24, the bottom area of the target basic region 21a, that is, the bottom area S of the footing unit 22 in the target basic region 21a is calculated. In this case, based on the length La of the target basic region 21a and the width W of the footing part 22, the bottom area S of the footing part 22 is calculated by multiplying La and W in detail. The width W of the footing unit 22 is acquired based on the basic cross section (cross section data X) set in the target basic region 21a.

  In step S25, the footing portion 22 of the target basic region 21a from the ground is based on the vertical load Ft acting on the target basic region 21a from the pillar 42a, the weight G of the target basic region 21a, and the bottom area S of the target basic region 21a. The ground pressure acting on the bottom surface is calculated (corresponding to the ground pressure calculation means). The contact pressure is a load per unit area that acts on the bottom surface of the footing unit 22 from the ground. In this case, the contact pressure is calculated by dividing the sum of the vertical load Ft and the weight G of the target basic region 21a by the bottom area S of the footing unit 22.

  In step S26, it is determined whether or not the calculated contact pressure is less than or equal to the ground strength of the ground. The ground strength of the ground is the ground strength of the ground on which the foundation 21K is constructed. This earth strength is stored in the storage unit 12 in advance. If the contact pressure is less than the earth bearing capacity, the process proceeds to step S28. On the other hand, if the contact pressure is greater than the earth bearing capacity, the process proceeds to step S27.

  In step S27, the footing width W of the basic cross section set in the target basic region 21a is changed. In this case, the cross-sectional data X having a footing width W larger than the basic cross-section (cross-section data) set (currently) in the target basic area 21a is selected from the cross-sectional data X stored in the basic cross-section database 17. Reading (extracting), the section data X is newly set as a basic section of the target basic area 21a. Specifically, among the cross-section data X stored in the basic cross-section database 17, the cross-section data X having the next footing width W next to the cross-section data set in the target basic area 21a is read, and the new basic cross-section is read out. Set as. In this case, the cross section data X read from the basic cross section database 17 has the same basic beam cross section (cross section of the basic beam portion 24) as the basic cross section (cross section data) set in the target basic region 21a. . Therefore, in this step, the footing width W is changed while maintaining the foundation beam section of the foundation section set in the target foundation region 21a.

  After step S27, the process returns to step S23, and the processes of steps S23 to S26 are performed again based on the basic cross section newly set in the target basic region 21a, that is, the basic cross section in which the footing width W is increased. Thus, in this process, the processes of steps S23 to S27 are repeatedly performed until it is determined in step S26 that the ground pressure is equal to or less than the earth bearing capacity.

  If it is determined in step S26 that the contact pressure is equal to or less than the earth bearing capacity, the footing width W (and thus the cross section of the footing portion 22) of the target basic region 21a is determined, and the process proceeds to step S28. In steps S28 to S31, S33, a process for determining the foundation beam section of the target foundation region 21a is performed. First, in step S28, a ground reaction force acting from the ground on the bottom surface of the footing part 22 of the target basic region 21a is calculated. The ground reaction force is calculated based on the weight G and the bottom area S of the target basic region 21a calculated in steps S23 to S25 and the contact pressure acting on the target basic region 21a. Specifically, the ground reaction force is obtained by subtracting a value obtained by dividing the weight G of the target basic region 21a by the bottom area S from the ground pressure.

  In step S29, the horizontal load Fs acting on the target basic region 21a from the pillar 42a is read from the storage unit 12 and acquired. Specifically, since the horizontal load Fs acting on the foundation 21K from the pillar 42 is stored in the storage section 12 for each pillar 42 of the building 40 (see step S13), the storage section 12 stores the horizontal load Fs from the pillar 42a to the foundation 21K. The horizontal load Fs acting on the (target basic region 21a) is read and acquired.

  In step S30, the stress (specifically, shear stress) generated in the foundation beam portion 24 of the target foundation region 21a at the time of the horizontal load in which the horizontal load Fs acts on the target foundation region 21a from the column 42a is calculated (corresponding to a stress calculation unit). In this case, based on the ground reaction force calculated in step S28 and the horizontal load Fs acquired in step S29, stress generated in the foundation beam portion 24 (hereinafter referred to as foundation beam stress) is calculated.

  In step S31, it is determined whether or not the calculated foundation beam stress is equal to or less than the allowable yield strength of the foundation section (section data X) set in the target foundation region 21a. In the present embodiment, the allowable strength is determined in advance for each cross-sectional data X stored in the basic cross-sectional database 17, and the allowable strength is stored in the database 17 in association with each cross-sectional data X. Yes. In this step, the allowable proof stress corresponding to the basic cross section (cross-section data X) set in the target basic region 21a is read from the basic cross-sectional database 17, and the above determination is performed by comparison with the read allowable proof stress.

  In step S31, if the foundation beam stress is equal to or less than the allowable proof stress, the process proceeds to step S32. On the other hand, if the foundation beam stress exceeds the allowable proof stress, the process proceeds to step S33.

  In step S33, the basic beam cross section (the cross section of the basic beam portion 24) is changed among the basic cross sections set in the target basic region 21a. In this case, among the cross-section data X stored in the basic cross-section database 17, the proof stress of the foundation beam portion 24 (more details) than the basic cross-section (cross-section data X) set in the target basic area 21a (currently). The cross-sectional data X having a large allowable proof stress is read (extracted), and the cross-sectional data X is newly set as the basic cross section of the target basic region 21a. Specifically, among the cross-section data X stored in the basic cross-section database 17, the cross-section data X having the greatest proof strength of the foundation beam portion 24 next to the cross-section data X set in the target basic area 21a is read out, Set as a new basic section. In this case, the cross section data X read from the basic cross section database 17 has the same footing width W as the basic cross section (cross section data) set in the target basic area 21a. Therefore, in this step, the foundation beam section is changed while maintaining the footing width W of the foundation section set in the target foundation area 21a (and thus the section of the footing portion 22).

  When changing the cross section of the foundation beam, as described above, the cross section data X having a greater proof strength of the foundation beam portion 24 than the foundation section (currently referred to as the current foundation section) set in the target foundation area 21a (currently). Read (extract) from the basic cross-section database 17, and set it as a new basic cross-section of the target basic area 21a. Here, when extracting the cross-sectional data X in which the proof strength of the foundation beam portion 24 is larger than that of the current foundation cross section, for example, it is conceivable to extract the cross-section data X having a width B of the foundation beam portion 24 larger than that of the current foundation cross section. . In addition, for example, it is conceivable to extract the cross-section data X in which the reinforcing bars 26 to 29 provided in the foundation beam portion 24 have higher strength than the current foundation cross section. Specifically, in this case, it is conceivable to extract cross-sectional data in which the diameter of at least one of the reinforcing bars 26 to 29 is larger than that of the current basic cross-section.

  After step S33, the process returns to step S30, and the steps of steps S30 and S31 are performed again based on the foundation section newly set in the target foundation region 21a, that is, the foundation section in which the section of the foundation beam portion 24 is changed to one having high strength. Process. Thus, in this process, the processes in steps S30, S31, and S33 are repeatedly performed until it is determined in step S31 that the foundation beam stress is equal to or less than the allowable yield strength.

  If it is determined in step S31 that the foundation beam stress is equal to or less than the allowable proof stress, the process proceeds to step S32. In this case, in addition to the footing width W (and consequently the footing cross section) of the target basic region 21a, the basic beam cross section is also determined. In step S32, the basic cross section set in the target basic region 21a is determined as the basic cross section of the target basic region 21a. Thereby, a basic cross section of the target basic region 21a is created (designed). Thereafter, this process is terminated.

  Returning to the description of FIG. 5, in step S <b> 17 after step S <b> 16 (basic cross-section design processing), it is determined whether or not the cross-section design has been completed for all target basic regions 21 a. If there is a target basic region 21a for which cross-sectional design has not been completed yet, the process returns to step S15, a new target basic region 21a is determined, and a basic cross-sectional design process (step S16) is performed on the target basic region 21a. If the cross-section design is completed for all target basic regions 21a, the process proceeds to step S18.

  In step S18, the result of the basic design process is output to the display unit 14. More specifically, the plan view (plan view) of the foundation 21K created in step S12 is displayed on the display unit 14, and the foundation section of each foundation region 21a created in step S31 is displayed on the display unit 14. Thereafter, this process is terminated.

  As mentioned above, according to the structure of this embodiment explained in full detail, the following outstanding effects are acquired.

  The design data of the unit type building 40 provided on the foundation 21K is acquired, and the load acting on the foundation 21K is calculated from the pillar 42 installed on the foundation 21K in the building 40 based on the acquired design data of the building 40. Is done. Then, based on the calculated load from the column 42, the cross-section design of the foundation 21K is performed. In this case, since the cross-section design of the foundation 21K can be performed according to the load actually acting on the foundation 21K from the pillar 42 of the building 40, an optimal foundation cross-section corresponding to the load situation of the building 40 can be designed. it can.

  A vertical load Ft acting on the foundation 21K is calculated from the pillar 42 of the building 40, and a ground pressure acting on the bottom surface of the footing portion 22 of the foundation 21K is calculated from the ground based on the calculated vertical load Ft. When the cross section of the foundation 21K is designed, the width W of the footing part 22 is determined based on the calculated contact pressure. Specifically, in this case, the footing width W is determined so that the contact pressure is equal to or less than the ground bearing capacity of the ground. In this case, the foundation cross section can be designed with an optimum footing width corresponding to the load status of the building 40 (vertical load status).

  A horizontal load Fs acting on the foundation 21K is calculated from the column 42 of the building 40. Based on the calculated horizontal load Fs, a stress (foundation beam stress) generated in the foundation beam portion 24 when the horizontal load acts on the foundation 21K is calculated. Calculated. When the cross section of the foundation 21K is designed, the cross section of the foundation beam portion 24 (the foundation beam section) is determined based on the calculated foundation beam stress. Specifically, the cross section of the foundation beam is determined so that the foundation beam stress is equal to or less than the allowable yield strength of the foundation beam portion 24. In this case, it is possible to design a foundation section having an optimum foundation beam section according to the building load situation (horizontal load situation).

  The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

  In the above embodiment, the cross-sectional data of the foundation 21 is stored in the basic cross-sectional database 17 as cross-sectional data, but numerical data (dimensions) data (for example, footing width W, width of the basic beam portion 24) are not cross-sectional data. B, outer dimensions such as height H, diameters of the reinforcing bars 26 to 29, etc.) may be stored. In this case, instead of initializing the basic cross section of the target basic region 21a in step S21 (FIG. 7), various numerical data (footing width W, basic beam portion necessary for specifying the basic cross section from the basic cross section database 17). 24 numerical data such as width B and height H) may be read and the read numerical data may be initially set as the basic dimensions (basic cross-sectional dimensions) of the target basic region 21a. In this case, in changing the footing width W in step S27 (FIG. 7), the footing width W having a value larger than the footing width W set in the target basic region 21a is read from the basic cross-section database 17, It is conceivable that the read footing width W is newly set as the footing width of the target basic region 21a. Further, in changing the foundation beam section in step S33 (FIG. 7), the dimensions (width B and height H of the foundation beam portion 24, etc.) regarding the foundation beam section set in the target foundation region 21a from the foundation section database 17 are used. It is conceivable to read out a basic beam dimension that increases the proof strength of the cross section of the basic beam than the basic beam dimension) and to newly set the read basic beam dimension as the basic beam dimension of the target basic region 21a. In step S32 (FIG. 7), it is conceivable to create (design) a basic cross section of the target basic region 21a based on various numerical data (basic dimensions) set in the target basic region 21a.

  In the above embodiment, the foundation 21 is divided into a plurality of foundation areas 21a, and the cross-sectional design is performed for each of the foundation areas 21a. However, the foundation 21 is not divided into the plurality of foundation areas 21a, and the entire foundation 21 is targeted. A cross-sectional design may be performed.

  In the above embodiment, the reinforcing bar information is included in the cross-sectional data X of the foundation 21 in addition to the cross-sectional shape of the foundation 21, but only the cross-sectional shape may be included without including the reinforcing bar information.

  In the above embodiment, the cross-section design of the fabric foundation 21 is performed using the foundation design device of the present invention. However, the foundation design is also used when performing cross-section design of foundations other than the fabric foundation such as a solid foundation and a pile foundation. An apparatus can be used.

  -For example, when applying the present invention to the cross-sectional design of a pile foundation, after calculating the vertical load acting from the column 42a on the target foundation region 21a, calculate the stress generated in each pile based on the vertical load, It is conceivable to determine the number of piles so that the calculated stress is less than the pile yield strength. In this case, the piles can be arranged in an optimum number according to the load condition of the building.

  DESCRIPTION OF SYMBOLS 10 ... Foundation design apparatus, 11 ... Control part, 12 ... Memory | storage part, 17 ... Foundation cross-section database, 21 ... Foundation, 22 ... Footing part, 23 ... Stand-up part, 24 ... Foundation beam part, 40 ... Unit type building, 41 ... Building unit, 42 ... pillar.

Claims (4)

A basic design system for designing a foundation of a unit type building constructed by connecting a plurality of building units having columns and beams to each other,
On the foundation, the building is provided by installing the pillar of the building unit,
Obtaining means for obtaining design data of the building;
Based on the design data of the building acquired by the acquisition means, a load calculation means for calculating a load acting on the foundation from the pillar,
Based on the load calculated by the load calculation means, a cross-sectional design means for performing the cross-sectional design of the foundation,
A basic design system characterized by comprising: The foundation is a fabric foundation having a footing portion embedded in the ground, and a rising portion exposed upward from the footing portion and exposed from the ground,
The load calculating means calculates a vertical load acting on the foundation from the column,
Based on the vertical load calculated by the load calculating means, comprising a ground pressure calculating means for calculating a ground pressure acting on the bottom of the footing part from the ground,
The basic design system according to claim 1, wherein the cross-section design unit determines a width of the footing unit based on the calculated contact pressure. In the foundation, the part including the rising part and spanning the entire vertical direction of the foundation is a foundation beam part,
The load calculating means calculates a horizontal load acting on the foundation from the column,
Based on the horizontal load calculated by the load calculation means, comprising: a stress calculation means for calculating the stress generated in the foundation beam portion when the horizontal load acts on the foundation as the foundation beam stress
3. The foundation design system according to claim 2, wherein the section design means determines a foundation beam section including a sectional shape of the foundation beam portion based on the foundation beam stress calculated by the stress calculation means.   The section of the foundation beam determined by the section design means includes information on reinforcing bars provided in the foundation beam section in addition to the sectional shape of the foundation beam section. Basic design system.

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