JP2019168838A - Design support apparatus, design support method, and design support program - Google Patents

Abstract

To support a structure design satisfying a predetermined standard for a cross section of a building member.SOLUTION: A design support apparatus includes: a model generation unit for reading from a storage device a three-dimensional building model indicating an arrangement of building members including a structural member, so as to convert a structure analysis model for structure calculation in which a cross section of the building members included in the three-dimensional model is set to a temporary size; and a cross section calculation unit for performing the structure calculation by using the structure analysis model and for performing the section calculation by repeatedly expanding the cross section of the structure members included in the structure analysis model until the predetermined standard is met.SELECTED DRAWING: Figure 1

Description

  The present technology relates to a design support apparatus, a design support method, and a design support program.

  2. Description of the Related Art Conventionally, a computer including an input operation unit that is operated by a designer to perform input, a display unit that displays various screens, and an arithmetic processing unit that receives an input signal from the input operation unit, processes the signal, and outputs the signal to the display unit A system has been proposed (for example, Patent Document 1). This computer system has a database in which the size and structure of basic components of pillars, beams, and floors corresponding to the number of floors of a building are structurally calculated and the standards are determined and recorded in advance. Basic structure data setting means for setting basic structure data such as the size of the building such as the number of X spans, the number of Y spans, the number of floors, the length of each span, the height of each floor, the type of structure, and the use of the building by operating the input operation means; Basic component data setting means for searching the database based on the number of floors and usage set by the basic structure data setting means and setting the standard of the size and structure of the basic components, and the operation of the designer's input operation means Change data setting means for setting change data obtained by changing basic structure data and basic component data by means of, and set basic structure data and basic component data The structural model constituting means for constructing the structural model by arranging the shape, columns, and beams of the building based on the set change data, and the structural model for each floor and each span of the structural model constituted by the structural model constituting means Image processing means for displaying a figure or the like on the display means.

JP 2003-343006 A JP 2001-207521 A JP 2010-250566 A Japanese Patent Laying-Open No. 2015-060415

  Conventionally, it has a database in which the size and structure of basic components of pillars, beams, and floors according to the number of floors of a building are structurally calculated and the standard is determined and recorded. The basic structure data such as the number of buildings, such as the number of X spans, the number of Y spans, the number of floors, each span length, and the height of each floor, the type of building, and the purpose of use of the building are set. Based on the above, a technique for searching from a database and setting a standard for the size and structure of basic components has been proposed. However, it has been difficult to determine the standard of the size and structure of the member so that it can be applied to any design.

  It aims at providing the technique for supporting the structural design which satisfy | fills a predetermined standard about the cross section of a building member.

  The design support apparatus according to the present invention reads out a three-dimensional model of a building indicating the arrangement of building members including a structural member from a storage device, and sets a cross section of the building member included in the three-dimensional model to a temporary size. The model generation unit that converts to the structural analysis model for structural calculation and the structural analysis model are used to perform the structural calculation, and the section of the structural member included in the structural analysis model is repeatedly expanded until the predetermined criteria are satisfied. A cross-section calculation unit that performs cross-section calculation.

  By repeating the process of enlarging the cross section so as to satisfy a predetermined standard, the cross section of the structural member can be designed to an appropriate size. That is, it is possible to support structural design that satisfies a predetermined standard for the cross section of the building member.

  In addition, the model generation unit arranges columns and beams in the structural analysis model based on the span and floor height input by the user, and the cross-section calculation unit responds to the use based on the use of the floor surface input by the user. In addition, a standard load stored in advance in a storage device may be read out and used for structural calculation. If it does in this way, structure calculation will be attained based on the assumed standard load.

  In addition, a secondary member design unit that arranges the secondary member with respect to the structural analysis model is further provided based on a predetermined rule, and the cross-section calculating unit calculates the cross-section using the structural analysis model in which the secondary member is arranged. You may make it perform. In this way, secondary members such as small beams, studs, and wind-resistant beams are arranged based on standard rules, and an analysis model that can analyze the order in which the hinges are generated based on more realistic stress conditions is created. can do.

  In addition, for the main frame of the structural members, the order of expanding the cross section and increasing the number of rebars is predetermined, and when the building is a reinforced concrete structure, the cross section calculation unit calculates the maximum stress generated in the cross section of the main frame. When the maximum stress exceeds the allowable stress level, the cross section of the main frame may be enlarged based on the order and the number of reinforcing bars may be increased. By predetermining the order in which the cross section is enlarged and the number of reinforcing bars is increased, for example, it is possible to avoid outputting a design in which a number of reinforcing bars that do not fit in the cross section are output, and to be arranged with the cross section of the main frame. Reinforcing bars can be increased in a well-balanced manner.

  When the building is a reinforced concrete structure, the cross-section calculation unit expands the cross-section of the structural member in a predetermined order so that the maximum interlayer deformation angle satisfies a predetermined condition, and then holds the building for each floor. You may make it expand the cross section of the said structural member until a horizontal proof stress satisfy | fills a predetermined required holding | maintenance horizontal proof stress. By first enlarging the cross section based on the maximum interlayer deformation angle, it is possible to reduce the amount of processing for enlarging the cross section of the structural member based on the retained horizontal proof stress in the secondary design. That is, the design that finally meets the standards required for the building can be completed at an early stage, and the number of repetitions of processing can be reduced.

  When the building has a reinforced concrete structure and has a load-bearing wall, the cross-section calculating unit may switch between increasing or decreasing the load-bearing wall strength based on the tower-like ratio of the building. This process is performed, for example, together with the calculation of the retained horizontal proof stress. In this way, it is possible to select an appropriate design according to the destruction mode. That is, a cost-effective design can be realized by selecting between shear fracture and bending fracture.

  When the building has a steel structure and has braces, the brace cross section or the beam cross section may be enlarged according to the βu value represented by the ratio of the total horizontal strength of the load bearing walls to the retained horizontal strength. This process is performed, for example, together with the calculation of the retained horizontal proof stress. By using such a standard, it is possible to appropriately determine a member that bears the proof stress.

  In addition, if the maximum value of beam formation is determined and the maximum stress generated in the cross section of the beam exceeds the allowable stress level, the cross section of the beam is enlarged in a predetermined order, and the predetermined maximum value of the beam formation is set. If it exceeds, the beam width may be increased. If it does in this way, the design request | requirement of the maximum value of the beam formation which the user specified, for example will be satisfy | filled, and the design which satisfy | fills a structural request | requirement can be performed.

Moreover, you may make it further provide the frame quantity calculation part which integrate | accumulates the frame quantity used for a building using the structural analysis model after a cross section enlargement. In this way, it is possible to obtain an approximate value of the amount of material required using the structural analysis model after the structural design is performed so that the design support apparatus satisfies the predetermined standard.

  The contents described in the means for solving the problems can be combined as much as possible without departing from the problems and technical ideas of the present invention. The contents of the means for solving the problems can be provided as a device such as a computer or a system including a plurality of devices, a method executed by the computer, or a program executed by the computer. The program can be executed on a network. Further, a recording medium that holds the program may be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the structural design which satisfy | fills a predetermined standard can be supported about the cross section of a building member.

It is a block diagram which shows an example of a design support apparatus. It is a processing flow figure showing an example of design support processing. It is a typical perspective view which shows an example of a structural analysis model. It is a typical top view which shows an example of a structural analysis model. It is a figure which shows an example of the initial value of the cross section of a pillar. It is a processing flowchart which shows an example of the automatic design of the main frame based on primary design. It is a figure which shows an example of matching with the main use of a floor surface, and a load. It is a figure which shows an example of the table which defined the order of the expansion of a cross section, and the increase in the number of reinforcing bars about the big beam in the case of RC structure. It is a processing flowchart which shows an example of the process which performs the automatic design of the main frame based on the secondary design in the case of RC structure. It is a processing flowchart which shows an example of the process which performs the automatic design of the main frame based on the secondary design in the case of RC structure. It is a processing flowchart which shows an example of the automatic design process of the main frame based on the secondary design in the case of S structure. An example of the basic automatic design process is shown. An example of the basic automatic design process is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Device configuration>
FIG. 1 is a block diagram showing an example of a design support apparatus according to the present invention. The design support apparatus is an apparatus for automating a part of the building design work and reducing the burden on the user. The design support apparatus arranges building members such as columns and beams with respect to the design data of the building, performs structural calculation, and determines the size of the cross section of the building member so as to satisfy a predetermined standard.

The design support apparatus 1 according to the present invention is a general computer and has a communication I / F (Interface).
) 11, storage device 12, input / output I / F (Interface) 13, processor 14, and bus 15.

  The communication I / F 11 is, for example, a wired network card or a wireless communication module, and transmits / receives information to / from another computer via a network (not shown).

  The storage device 12 includes a main storage device such as a RAM (Random Access Memory) and a ROM (Read Only Memory), and an auxiliary storage device (secondary storage) such as an HDD (Hard-disk Drive), an SSD (Solid State Drive), and a flash memory. Device). The main storage device caches programs and data read by the processor and secures a work area for the processor. The auxiliary storage device stores design data expressed in accordance with a program executed by the processor and a standard such as BIM (Building Information Modeling).

  The input / output I / F 13 is connected to an input device such as a keyboard, a mouse, and a touch panel, and an output device such as a printer. The user's operation is accepted or information is output to the user via the input / output I / F 13.

The processor 14 is an arithmetic processing unit such as a CPU (Central Processing Unit), and performs each process according to the present embodiment by executing a program. Specifically, the processor 14 functions as a model generation unit 141, a secondary member design unit 142, a cross section calculation unit 143, and a housing quantity calculation unit 144.

  The model generation unit 141 generates a structural analysis model that is design information that represents a structural frame of a building, based on a design BIM model that is design information that represents the design of the building. The secondary member design unit 142 arranges secondary members such as small beams, wind resistant beams, and studs for the structural analysis model. The cross section calculation unit 143 performs the structural calculation using the structural analysis model. When the building does not satisfy the predetermined standard, the cross section of the main frame or the foundation such as a large beam or a column is enlarged. Increase the amount of rebar. The frame quantity calculation unit 144 calculates the frame quantity such as the total amount of concrete, formwork, rebar, steel frame, and the like based on the structural analysis model.

  The components as described above are connected via the bus 15. The design support apparatus 1 may not include some components such as the communication I / F 11 and the input / output I / F 13. The design support apparatus 1 may output the result of the processing according to the present embodiment to another computer via a network (not shown) such as the Internet.

<Design support processing>
FIG. 2 is a process flow diagram showing an example of the design support process according to the present embodiment. The model generation unit 141 of the design support apparatus 1 reads a three-dimensional (3D) model that is stored in advance in the storage device 12 and indicates the arrangement of building members including structural members (FIG. 2: S1). The three-dimensional model may be data constituting the BIM model. As the three-dimensional model, so-called CAD (Computer-Aided Design) data or other three-dimensional models may be used. For example, a design BIM model that is design information such as a 3D model representing a design of a building is read. The design BIM model may be a 3D model generated by conversion from an escape on a plane created by a user. The model generation unit 141 converts the design BIM model into a structural analysis model, and stores the converted structural analysis model in the storage device 12 (S2). The structural analysis model refers to design information such as a 3D model representing a structural frame of a building.

  FIG. 3 is a schematic perspective view showing an example of the structural analysis model output in S2. FIG. 4 is a schematic plan view showing an example of the structural analysis model output in S2. In FIG. 3, the drawing of the wall surface is omitted. In addition, FIG.3 and FIG.4 is an example, Comprising: It does not represent the same building. The structural analysis model output in S2 is generated based on the design BIM model based on information including the span, floor height, column position, wall position, floor position, and floor usage input by the user. The part 141 is a simple BIM model in which columns, large beams, and the like are arranged. At this time, the model generation unit 141 sets the initial value of a sufficiently small temporary size such as the lowest possible size of the cross section of the column or the large beam.

  In addition, as illustrated in FIG. 4, the girder is a girder that is connected in a straight line via a column for each attribute of a region such as a general part, a common part, or a low-rise part, and has a span (length). The same reference numerals may be assigned to those equal to each other, and the cross sections of the beams having the same reference numerals may be unified in the processing described later. Also, the pillars of different floors arranged in a straight line may be given the same reference (not shown), and the pillars with the same reference may be unified in the process described later.

  FIG. 5 is a diagram illustrating an example of an initial value of a cross section of a column. In the example of FIG. 5, an example of one to four stories is shown. Further, the table of FIG. 5 has attributes of b × D and reinforcing bars. In the b × D field, the size of the cross section of the column is stored. b is the pillar width (found width), and D is the pillar width (depth). In the example of FIG. 5, the size is represented by a symbol. In the reinforcing bar field, the number of main bars in the depth direction and the type of reinforcing bar are connected with a hyphen.

  It is assumed that the initial value is similarly determined in advance for the large beam. FIG. 5 shows an example of a reinforced concrete structure (RC structure). In the case of a steel structure (S structure), the initial value of the cross section determined by the type (shape) of the steel frame and the size of each part is a column. And for large beams. In the case of the S structure, the members of the large beam may be defined for the end and the center.

  Further, the secondary member design unit 142 of the design support apparatus 1 arranges the secondary member for the structural analysis model output in S2 (FIG. 2: S3). In this step, secondary members such as small beams, studs, and wind resistant beams are arranged based on a predetermined rule. For example, the small beams are arranged at predetermined intervals between the large beams so that a predetermined number of small beams are arranged on a floor surface having a predetermined area. The stud is arranged at the end of the wall. The wind resistant beams are disposed above and below the opening provided in the wall.

  Further, the cross-section calculating unit 143 of the design support apparatus 1 performs automatic design of the main frame based on the primary design (FIG. 2: S4). Details of this step will be described with reference to FIG.

  FIG. 6 is a processing flowchart showing an example of automatic design of the main frame based on the primary design. The cross-section calculation unit 143 performs load calculation based on the structural analysis model in which the secondary member is arranged in S3 (FIG. 6: S11). In this step, an assumed load is calculated based on a load associated with a floor use in advance.

FIG. 7 is a diagram illustrating an example of the correspondence between the main use of the floor surface and the load. In the example of FIG. 7, the force per unit area of the area where each use is set is associated with the main use such as roof, living room, hallway, balcony, entrance hall, equipment room, roadway, warehouse,. The size (N / m ² ) is stored. Using such load information, the magnitude of the load is calculated for each region of the floor surface. The load information may be used by defining a loaded load and a finish load.

  Moreover, the cross-section calculation part 143 performs a stress analysis (FIG. 6: S12). In this step, the stress applied to the column and the large beam is calculated. That is, the cross-section calculating unit 143 calculates the vertical stress and shear force per unit area generated in members such as columns and large beams. An existing method can be used to calculate the stress. Moreover, the stress which the said member receives shall be calculated about each member.

  Moreover, the cross-section calculation part 143 calculates a bending stress degree (edge stress degree) and a shear stress degree about a column and a big beam (S13). The edge stress level and the shear stress level can be calculated using, for example, a section modulus by an existing method.

  Then, the cross-section calculating unit 143 determines whether the calculated edge stress level and shear stress level exceed the allowable stress level (S14). The allowable stress level is determined according to the cross-sectional area of the building member, the number of main bars, the material type, and the like. Further, in this step, it is determined whether the stress level of the main frame such as a column or a large beam exceeds the allowable stress level.

  When it is determined that the bending stress applied to the member of the structural analysis model exceeds a predetermined allowable stress level (S14: NO), the cross section calculating unit 143 enlarges the cross section of the member (S15). For example, it is assumed that a plurality of combinations of beam formation, beam width, the number of reinforcing bars, and material types as shown in FIG.

  FIG. 8 is a diagram illustrating an example of a table in which the order of the enlargement of the cross section and the increase in the number of reinforcing bars is defined for the large beam in the case of the RC structure. In S15, the process of enlarging the cross section of the member and increasing the number of reinforcing bars is performed according to the order defined in the table as shown in FIG. That is, by preliminarily defining a cross section in which a sufficient number of main bars are arranged with respect to the size of the cross section, a design that can be automatically constructed can be performed. At this time, the strength of the concrete is not changed. Further, the column formation, the column width, and the arrangement of the column reinforcement are determined according to the cross section of the beam and the arrangement of the reinforcement. Specifically, the cross section of the pillar and the arrangement of the reinforcing bars shown in FIG. 8 may be determined in association with the arrangement of the cross sections and the reinforcing bars of the large beam shown in FIG. From the above, the cross section of the column and the arrangement of the reinforcing bars may be determined based on a predetermined rule.

  Further, when it is determined that the shear stress level calculated in S13 does not satisfy the allowable stress level in S14, the shear reinforcement bars (hoop bars (band bars) in the columns) or the predetermined order of application are determined. A table storing the number of stirrup bars (barbs) in the beam and the combination of the grades is read from the storage device 12, and the shear reinforcement is increased or the grade is changed according to the order.

  In the case of the S structure, a table defining the order of expansion of the cross section and material type of the steel frame is stored in the storage device 12 in advance, and in S15, the cross section is expanded based on the table.

  In S construction and RC construction, the user may set an upper limit value of beam formation as design data in advance. In this case, if the beam cross section is enlarged according to the above table and the upper limit of the beam formation is exceeded, the beam formation size may be fixed to a value not exceeding the upper limit, and only the beam width may be enlarged. .

  On the other hand, when it is determined in S14 that the stress level does not exceed the allowable stress level (S14: YES), the cross-section calculating unit 143 unifies the cross-sectional sizes. In this step, for example, the size of the cross section and the arrangement of the reinforcing bars may be unified for the large beams connected in a straight line via columns and having the same span. Moreover, the size of the cross section and the arrangement of the reinforcing bars may be unified for columns existing at corresponding positions on the upper and lower floors.

  This completes the automatic design process for the main frame based on the primary design.

  In addition, the cross-section calculation unit 143 performs automatic design of the main frame based on the secondary design (FIG. 2: S5). The details of this step will be described separately for processing performed in the case of RC construction and processing performed in the case of S construction.

FIG. 9 is a process flow diagram showing an example of a process for automatically designing the main frame based on the secondary design in the case of the RC structure. Note that load calculation and stress analysis are performed in advance similarly to S11 to S12 of FIG.

  The cross section calculating unit 143 determines whether the maximum interlayer deformation angle is equal to or smaller than a predetermined reference (FIG. 9: S21). The maximum interlayer deformation angle is obtained as the largest value among the values obtained by dividing the horizontal displacement of each floor during the earthquake by the floor height. The maximum interlayer deformation angle can also be obtained by an existing method. In addition, the predetermined standard adopts a value smaller than a legal standard (for example, 1/200).

  When it is determined that the maximum interlayer deformation angle exceeds a predetermined reference (S21: NO), the rigidity of the frame is improved. In this step, the cross-section calculating unit 143 expands the beam width of the floor and the upper floor, and the pillar formation of the floor.

  Specifically, a stress analysis is performed by adding a predetermined size to each of the beam width and column formation (S22), and the process returns to the determination in S21. After completion of the automatic design based on the primary design, the process performed in S32 to be described later by determining the beam width and column formation so that the interlayer deformation angle satisfies a predetermined standard at the start of the automatic design based on the secondary design. Can be reduced.

  On the other hand, when it is determined in S25 that the maximum interlayer deformation angle is equal to or smaller than the predetermined reference (S25: YES), the cross section calculating unit 143 performs cross section calculation (S23). In this step, the cross section calculating unit 143 calculates the bending stress level and the shear stress level for the column and the large beam. The edge stress level and the shear stress level can be calculated using, for example, a section modulus by an existing method.

  Further, the cross-section calculating unit 143 calculates the retained horizontal proof stress using the structural analysis model (S24). The retained horizontal proof stress (Qu) is obtained as the sum of the horizontal shear forces of the pillars, bearing walls and braces (bars) on each floor. Existing techniques can be used as a method for calculating the retained horizontal strength.

In addition, the cross-section calculation unit 143 determines whether the retained horizontal proof stress satisfies a predetermined standard in all floors (S25). As the predetermined standard, a required holding horizontal proof stress or a value based thereon can be adopted. Moreover, the required possessed horizontal proof stress (Qun) of each floor is calculated | required by the following formula | equation (1), for example.
Qun = Ds × Fes × Qud (1)
Ds is a structural characteristic coefficient of each floor, Fes is a shape characteristic coefficient of each floor, and Quad is a horizontal force generated on each floor by seismic force. In step S22, it may be determined whether the retained horizontal strength obtained in S21 is greater than the required retained horizontal strength. For safety, the value obtained by multiplying the required retained horizontal strength by a predetermined coefficient is used as a reference. It may be determined whether the retained horizontal proof stress obtained in S21 is larger than the reference.

  When it is determined that the retained horizontal proof stress exceeds a predetermined standard in all floors (S25: YES), the main frame automatic design process based on the secondary design is terminated. On the other hand, if it is determined that the retained horizontal proof stress does not exceed the predetermined standard in any floor (S25: NO), the defective portion is resolved (S26). In this step, the number of shear reinforcement bars is increased with respect to the brittle fracture member. For example, the stirrup muscles (cruciform muscles) are increased with respect to the brittle fracture member of the beam. Regarding the increase in the number of reinforcing bars, the order of increasing the combination of the number and the material type is performed based on a predetermined table. Further, the column reinforcement may be increased so that the column hinge is eliminated and the beam hinge is formed. Thereafter, the processing transits to FIG.

Moreover, the cross-section calculation part 143 judges whether it has a bearing wall (FIG. 10: S27). Note that the bearing wall is arranged, for example, when the design BIM model read in S1 of FIG. 2 is arranged, or when the user adds a brace to the structural analysis model by S27 (none is shown). ing. When there is no bearing wall (S27: NO), it is determined whether there is a deficiency floor, and if it exists, the beam is reinforced (S28). In this step, with respect to the beams on the floor and the upper floor, the number of reinforcing bars of the members that generate hinges at an early stage is increased, and when the beam width is insufficient, the beam width is increased by a predetermined size, and the connector B is Then, the process returns to S24. Whether or not the beam width is sufficient with respect to the number of reinforcing bars is determined based on the information in the table by previously storing the number of reinforcing bars and the necessary beam width in association with each other in advance.

  Moreover, when it is judged that it has a load-bearing wall in S27 (S27: YES), the cross-section calculation part 143 specifies a load-bearing insufficient floor (S29).

  Further, the cross-section calculating unit 143 determines whether the tower ratio is equal to or less than a threshold value (S30). The tower ratio is determined as the ratio of the height of the building to the width of the building. When the tower ratio is not less than the threshold (S30: NO), the wall length is reduced (S31). In this step, the number and type of wall struts are changed according to a predetermined table within a range not exceeding a predetermined minimum value. For earthquake-resistant walls, the thickness of the reinforcing bars of the vertical and horizontal bars and the interval between the reinforcing bars for each inner wall or outer wall and for each floor are the initial value table as shown in FIG. 5 and the order as shown in FIG. Is stored in advance in a table indicating.

  Moreover, the cross-section calculation part 143 reduces the main reinforcement of a bearing wall direction. For the main reinforcement in the bearing wall direction, the number and the material type are changed according to a predetermined table so as not to exceed a predetermined minimum value. Thereafter, the process returns to S24 in FIG.

  On the other hand, when it is determined in S30 that the tower ratio is equal to or less than the threshold value (S30: YES), the wall thickness is increased or the reinforcement is increased (S32). Also in this step, the wall thickness is increased or the reinforcement is increased according to a table in which the order of increasing the combination of the wall thickness and the number of reinforcements is determined in advance. Thereafter, the process returns to S24 in FIG.

  Based on the tower-like ratio, an appropriate design corresponding to the fracture mode can be selected by reducing the strength of the floor with insufficient strength and decreasing the strength or increasing the strength of the reinforcing rod to improve the strength. That is, a cost-effective design can be realized by selecting between shear fracture and bending fracture.

  As described above, the process is repeated until the retained horizontal proof stress satisfies the standard on all floors.

  FIG. 11 is a process flow diagram showing an example of an automatic design process for the main frame based on the secondary design in the case of the S structure. Note that load calculation, stress analysis, and cross-sectional calculation are performed in advance in the same manner as S11 to S13 in FIG. The cross section calculation unit 143 calculates the retained horizontal proof stress using the structural analysis model (FIG. 11: S41). The calculation of the retained horizontal proof stress (Qu) is the same as the process of S21 of FIG.

  In addition, the cross-section calculating unit 143 determines whether the retained horizontal proof stress satisfies a predetermined standard at all floors (S42). The processing in this step is the same as S22 in FIG.

When it is determined that the retained horizontal proof stress exceeds the predetermined standard in all the floors (S42: YES), the main frame automatic design process based on the secondary design is terminated. On the other hand, when it is determined that the retained horizontal proof stress does not exceed the predetermined standard in any floor (S42: NO), the cross-section calculating unit 143 determines the presence or absence of braces for the floor that does not satisfy the standard (S43). For example, when the brace is arranged in the design BIM model read in S1 of FIG. 2 or when the user adds a brace to the structural analysis model by S43 of FIG. 11 (none of which is shown), Has been placed.

  When the brace does not exist (S43: NO), the cross section calculating unit 143 enlarges the cross section of the beam member (S44). Also in this step, the cross section of the beam is enlarged in accordance with a table that defines the order of increasing the type of steel frame and the size of each part.

  On the other hand, when it is determined in S43 that there is a brace (S43: YES), the cross-section calculating unit 143 determines whether the βu value is less than the threshold (S45). The value of βu can be obtained as the ratio of the sum of the horizontal proof stresses of the load bearing walls to the retained horizontal proof stress. When the βu value is not less than the threshold value (S45: NO), the cross section calculating unit 143 enlarges the cross section of the brace (S46). In this step, the cross section of the brace is enlarged according to a table that defines the order of increasing the type of steel frame and the size of each part. Then, the process returns to S41.

  If the βu value is equal to or greater than the threshold value (S45: YES), the cross section calculation unit 143 enlarges the cross section of the beam member (S47). Also in this step, the cross section of the beam is enlarged in accordance with a table that defines the order of increasing the type of steel frame and the size of each part. Further, the process of enlarging the cross section of the beam using the second threshold value smaller than the threshold value (first threshold value) used in S45 until the βu value becomes equal to or smaller than the second threshold value may be repeated in S45. . Then, the process returns to S41.

  As described above, the process is repeated until the retained horizontal proof stress satisfies the standard on all floors.

  In addition, the cross-section calculating unit 143 performs a basic automatic design process (FIG. 2: S6). Details of this step will be described with reference to FIG. FIG. 12 shows an example of an automatic design process for a cast-in-place pile formed by a bottom expansion method (earth drill method) for expanding the pile bottom. In addition, ground conditions and the like are set in advance, and the concrete strength is assumed to be constant. Note that the processing shown in FIG. 12 may be performed for each of the short-term allowable shear force and the long-term allowable shear force.

  The cross-sectional calculation part 143 calculates the shear force which the middle pile part which is a center part of a pile bears (FIG. 12: S51). In this step, for example, the allowable shear force is calculated based on a predetermined calculation formula.

  Moreover, the cross-section calculation part 143 judges whether a pile has predetermined intensity | strength (S52). In this step, the cross-section calculating unit 143 determines whether, for example, the allowable shear force is greater than a predetermined number of times the shear stress, for example. When it is determined that the predetermined strength is not obtained (S52: NO), the cross-section calculating unit 143 expands the shaft diameter of the pile (S53). In this step, the cross section calculating unit 143 adds a predetermined value to the shaft diameter. Then, the process returns to S51.

  On the other hand, when it is determined in S52 that the pile has a predetermined strength (S52: YES), the cross-section calculating unit 143 verifies whether the bar arrangement satisfies a predetermined condition (S54). The predetermined condition can determine, for example, that the rebar spacing of the main bars is greater than or equal to a predetermined size, that the hoop muscle spacing is less than or equal to a predetermined size, and that the amount of main bars is greater than or equal to a predetermined value. For example, the interval between the main bars is obtained as a value obtained by dividing the length of the circumference calculated as the diameter by subtracting the provisional steel pipe thickness from the diameter of the pile by the number of reinforcing bars.

Further, the cross section calculating unit 143 determines whether the bar arrangement is sufficient (S55). In this step, the cross section calculation unit 143 determines whether or not the predetermined condition shown in S54 is satisfied. When it is determined that the bar arrangement is not sufficient (S55: NO), the cross-section calculating unit 143 increases the shaft diameter of the pile (S56). In this step, the cross section calculating unit 143 adds a predetermined value to the shaft diameter. By enlarging the shaft diameter, the amount of reinforcing bars accommodated in the pile can be increased. Then, the process returns to S55.

  On the other hand, when it is determined in S55 that the bar arrangement is sufficient (S55: YES), the process proceeds to the process of FIG. FIG. 13 is also a process flow diagram illustrating an example of an automatic design process for cast-in-place piles.

  The cross section calculating unit 143 determines the steel pipe thickness for the steel pipe part of the pile (FIG. 13: S57). In this step, the steel pipe thickness is determined according to the shaft diameter of the middle pile portion determined by the processing of FIG.

  Next, the cross-sectional calculation part 143 improves the instruction | indication force by enlarging the diameter of a bottom expanded part, when the supporting force of a pile is not enough. First, the cross-section calculating unit 143 calculates the pile support force (S58). In this step, the cross-section calculating unit 143 calculates the pile supporting force (kN / piece) according to a predetermined calculation formula. Further, the cross-section calculating unit 143 determines whether the pile supporting force is equal to or greater than a predetermined threshold (S59). In this step, the cross-section calculating unit 143 determines whether the pile supporting force calculated in S58 is equal to or greater than the axial force for pile design that is determined in advance as a threshold value. Moreover, when it is judged that a pile supporting force is less than a threshold value (S59: NO), the cross-section calculation part 143 expands an effective bottom expanded diameter (S60). The effective bottom diameter can be obtained, for example, as a value obtained by subtracting a predetermined value from the construction bottom diameter. In this step, the cross-section calculation unit 143 adds a predetermined value to the effective bottom diameter.

  Further, the cross section calculating unit 143 determines whether the shaft diameter is sufficient (S62). The range of the effective bottom diameter in association with the shaft diameter is stored in the storage device 12 in advance, and in this step, the cross-section calculating unit 143 determines whether the size of the effective bottom diameter with respect to the shaft diameter is within the allowable range. .

  When it is determined that the shaft diameter is not sufficient, the cross-section calculating unit 143 increases the shaft diameter (S62). In this step, the cross section calculating unit 143 adds a predetermined value to the shaft diameter. Then, the process returns to S61.

  On the other hand, if it is determined in S61 that the shaft diameter is sufficient (S61: YES), the basic automatic design process is terminated.

Also, the chassis quantity calculation unit 144 calculates (integrates) the chassis quantity (FIG. 2: S7). In this step, the frame quantity calculation unit 144 uses the structural analysis model to calculate the total amount of concrete (m ³ ), the total amount of formwork (m ² ), the total amount of reinforcing bars (t), the total amount of steel frames (t), the elongation Calculate the amount of concrete, formwork, rebar and steel frame, the amount of rebar and formwork per unit of concrete. Further, the chassis quantity calculation unit 144 may output the calculated chassis quantity to the user via the input / output I / F 13, or even if another program uses the structural analysis model after the cross section is enlarged. Good. Alternatively, the body quantity calculation unit 144 or another program may calculate the cost estimate using the amount of concrete or the amount of reinforcing bars calculated in S7.

  Thus, the design support process according to this embodiment is completed. In addition, the building member for structural analysis is automatically designed by the above-described process, and the user may be able to change the arrangement and size of the building member as appropriate.

<Effect>
According to the design support apparatus according to the embodiment, in the primary design and the secondary design, the cross section of the structural member is designed to have an appropriate size by repeating the process of enlarging the cross section so as to satisfy a predetermined standard. Will be able to. That is, it is possible to support structural design that satisfies a predetermined standard for the cross section of the building member. In addition, by automatically arranging secondary members such as small beams, studs, and wind-resistant beams based on standard rules, an analysis model that can analyze the order in which hinges are generated based on more realistic stress conditions Can be created.

  Further, by automatically expanding the cross section of the building member using the analysis model, for example, a three-dimensional model that satisfies the requirements for safety required for a building can be generated. In particular, by performing such processing on the BIM model, it is also possible to output the number of frames using the generated three-dimensional model, for example, a highly accurate estimate of the amount of concrete and the amount of reinforcing bars required. Can be output without taking time and effort to the user.

  Specifically, in RC construction, by setting a table as shown in FIG. 8 in advance, it is possible to avoid outputting a design that places, for example, a number of reinforcing bars that do not fit in the cross section, and to prevent the main frame from being output. The cross section and the reinforcing bars to be arranged can be increased in a balanced manner. Moreover, according to S21-S22 of FIG. 9, the design which finally satisfy | fills the reference | standard requested | required of a building can be completed at an early stage by roughly expanding a cross section on the basis of the maximum interlayer deformation angle. The number of repetitions can be reduced. Moreover, according to S30-S32 of FIG. 10, when it has a load-bearing wall, the suitable design from which a destruction mode differs according to tower | column shape ratio can be selected. That is, a cost-effective design can be realized by selecting between shear fracture and bending fracture.

  Further, in the enlargement of the cross section shown in S15 of FIG. 6 and S44 and S47 of FIG. 11, the beam width may be enlarged when a predetermined maximum value of the beam formation is exceeded. If it does in this way, the design request | requirement of the maximum value of the beam formation which the user specified, for example will be satisfy | filled, and the design which satisfy | fills a structural request | requirement can be performed.

<Others>
In addition, embodiment is an illustration and this invention is not limited to the structure mentioned above. The subject of the present invention also includes a computer program that executes the above-described processing and a computer-readable recording medium that records the program. The recording medium on which the program is recorded can perform the above-described processing by causing the computer to execute the program.

  Note that the computer-readable recording medium refers to a recording medium in which information such as data and programs is accumulated by electrical, magnetic, optical, mechanical, or chemical action and can be read from a computer. Examples of such a recording medium that can be removed from the computer include a flexible disk, a magneto-optical disk, an optical disk, a magnetic tape, and a memory card. In addition, examples of the recording medium fixed to the computer include an HDD, an SSD (Solid State Drive), and a ROM.

1: Design support device 11: Communication I / F
12: Storage device 13: Input / output I / F
14: Processor 141: Model generation unit 142: Secondary member design unit 143: Section calculation unit 144: Body quantity calculation unit 15: Bus

Claims (11)

A structural analysis model for structural calculation in which a three-dimensional model of a building is read from a storage device, showing a layout of the building member including the structural member, and a cross section of the building member included in the three-dimensional model is set to a temporary size A model generator for converting to
Performing a structural calculation using the structural analysis model, and a cross-sectional calculation unit that performs a cross-sectional calculation by repeatedly expanding a cross section of the structural member included in the structural analysis model until a predetermined criterion is satisfied;
A design support apparatus comprising: The model generation unit arranges columns and beams in the structural analysis model based on the span and floor height input by the user,
The section calculation unit reads out a standard load stored in a storage device in advance in association with the use based on the use of the floor surface input by the user, and uses it for the structure calculation. Design support device. A secondary member design unit for arranging a secondary member with respect to the structural analysis model based on a predetermined rule;
The design support apparatus according to claim 1, wherein the cross-section calculation unit performs the cross-section calculation using a structural analysis model in which a secondary member is arranged. For the main frame among the structural members, the order of expanding the cross section and increasing the number of reinforcing bars is predetermined,
When the building is a reinforced concrete structure, the cross-section calculating unit calculates the maximum stress generated in the cross-section of the main frame. When the maximum stress exceeds the allowable stress level, the cross-section of the main frame is calculated based on the order. The design support device according to any one of claims 1 to 3, wherein the design support device expands and increases the number of reinforcing bars. When the building has a reinforced concrete structure, the cross-section calculating unit enlarges the cross-section of the structural member in a predetermined order so that the maximum interlayer deformation angle satisfies a predetermined condition, and thereafter, for each floor of the building The design support apparatus according to any one of claims 1 to 4, wherein a cross section of the structural member is expanded until the retained horizontal proof stress satisfies a predetermined required retained horizontal proof stress. The said cross-section calculation part switches whether to improve or reduce the proof stress of a load-bearing wall based on the tower-like ratio of the said building when the said building is a reinforced concrete structure and has a load-bearing wall. The design support apparatus according to any one of the above. When the building has a steel structure and has braces, the brace cross section or the beam cross section is enlarged according to the βu value represented by the ratio of the total horizontal strength of the load bearing walls to the retained horizontal strength. The design support apparatus according to any one of the above. Set the maximum value of beam formation,
When the maximum stress generated in the cross section of the beam exceeds the allowable stress level, the cross section of the beam is expanded in a predetermined order, and when the maximum value of the predetermined beam formation is exceeded, the beam width is expanded. Item 8. The design support apparatus according to any one of Items 1 to 7. The design according to any one of claims 1 to 8, further comprising a frame quantity calculation unit that adds up the number of frames used in the building using a structural analysis model after the cross section is enlarged. Support device. A structural analysis model for structural calculation in which a three-dimensional model of a building is read from a storage device, showing a layout of the building member including the structural member, and a cross section of the building member included in the three-dimensional model is set to a temporary size A model generation step to convert to
Performing a structural calculation using the structural analysis model, and performing a cross-sectional calculation step by repeatedly expanding the cross section of the structural member included in the structural analysis model until a predetermined standard is satisfied;
Design support method in which the computer executes. A structural analysis model for structural calculation in which a three-dimensional model of a building is read from a storage device, showing a layout of the building member including the structural member, and a cross section of the building member included in the three-dimensional model is set to a temporary size A model generation step to convert to
Performing a structural calculation using the structural analysis model, and performing a cross-sectional calculation step by repeatedly expanding the cross section of the structural member included in the structural analysis model until a predetermined standard is satisfied;
Design support program that causes a computer to execute.

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