Method for designing structure

Abstract

To provide a method for designing a structure capable of determining with high accuracy whether or not an expansion joint is required.SOLUTION: A method for designing a structure according to one embodiment comprises the steps of: obtaining a drying shrinkage rate of concrete constituting a structure; predicting, from the drying shrinkage rate, a first strain which is a strain generated in a member constituting the structure by the drying shrinkage of the concrete; obtaining a linear expansion coefficient of the concrete; setting a specification of a heat insulating material constituting the structure and a location of the heat insulating material; predicting, from the linear expansion coefficient of the concrete, the specification of the heat insulating material, and the location of the heat insulating material, a second strain which is a strain generated in the member due to temperature change; inputting the first strain and the second strain to analyze stress and deformation generated in the member; and determining whether or not the structure meets the target performance on the basis of results of the analysis of the stress.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a structure design method used when designing a structure. [Background technology]

[0002] In recent years, there has been an increase in long buildings with lengths exceeding 100m, especially in production facilities and accommodation facilities. In long buildings, the drying shrinkage of concrete or expansion and shrinkage due to annual temperature changes caused by the outside air can cause long-term deformation of the building, resulting in large stress. Expansion joints are sometimes used to relieve this stress.

[0003] Patent Document 1 describes an expansion joint that covers a gap formed in a pair of bodies. The expansion joint includes a cover body that covers the gap formed between a pair of bodies, a storage section located between one of the pair of bodies and the cover body, a connecting member located on the other of the pair of bodies, and a support member located below the cover body.

[0004] A portion of the cover body is placed on the storage section, and the cover body is slidable in a horizontal direction relative to the storage section. The connecting member is fixed to a side end of the body, and supports an end of the cover body at the side end of the body. The support member is provided between the storage section and the connecting member, and supports the cover body that slides along the horizontal direction. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2003-129576 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when constructing a structure, installing expansion joints can cause problems such as increased costs and increased construction time. It can also cause problems such as the location where the expansion joint is installed becoming a weak point in terms of waterproofing. Therefore, it is desirable not to install expansion joints unless they are necessary.

[0007] However, because there is no established method for determining whether or not an expansion joint is necessary, expansion joints are currently installed even when they are not required. Therefore, there is a need for a method for determining whether or not an expansion joint is necessary before a structure is constructed.

[0008] The present disclosure aims to provide a structure design method that can determine with high accuracy whether or not an expansion joint is required. [Means for solving the problem]

[0009] (1) A structure design method according to the present disclosure includes a step of acquiring the drying shrinkage rate of concrete constituting the structure, a step of predicting a first strain, which is a strain generated in a component constituting the structure due to the drying shrinkage of the concrete, from the drying shrinkage rate, a step of acquiring the linear expansion coefficient of the concrete, a step of setting specifications of an insulating material constituting the structure and a position of the insulating material, a step of predicting a second strain, which is a strain generated in the component due to a temperature change, from the linear expansion coefficient of the concrete, the specifications of the insulating material, and the position of the insulating material, a step of inputting the first strain and the second strain to analyze the stress and deformation generated in the component, and a step of determining whether the structure satisfies a target performance based on the results of the stress analysis.

[0010] In this structure design method, the drying shrinkage rate of the concrete constituting the structure is acquired, and the first strain, which is the strain caused in the member due to the drying shrinkage of the concrete, is predicted from the drying shrinkage rate. The second strain, which is the strain caused in the member due to temperature change, is predicted from the linear expansion coefficient of the concrete constituting the structure, the specifications of the insulation material, and the position of the insulation material. Then, the stress and deformation caused in the member due to the first strain and the second strain are analyzed, and it is determined from the result of this analysis whether or not the structure satisfies the target performance. By determining whether or not the performance is satisfied from the analysis result of the stress and deformation obtained using the first strain caused in the member due to drying shrinkage and the second strain caused in the member due to temperature change, it is possible to determine whether or not an expansion joint is required, taking into account the drying shrinkage and temperature change. In other words, if it is determined that the performance is satisfied based on the effects of drying shrinkage and temperature change that may occur in the structure, it is determined that an expansion joint is unnecessary, and if it is determined that the performance is not satisfied, it is determined that an expansion joint is necessary. Therefore, it is possible to determine whether or not an expansion joint is required with high accuracy.

[0011] (2) In the above (1), the structure design method may include a step of judging whether or not the structure has any stress concentration points or any points where stress becomes excessive from the stress distribution of the structure obtained as a result of the analysis, and a step of adding reinforcing bars to the members when it is judged that there are any stress concentration points or any points where stress becomes excessive. After the step of adding reinforcing bars to the members, a step of judging whether or not the structure satisfies the target performance may be executed. In this case, it is judged whether or not there are any stress concentration points or any points where stress becomes excessive from the results of the analysis, and reinforcing bars are added when it is judged that there are any stress concentration points or any points where stress becomes excessive. Therefore, by adding reinforcing bars as necessary as a result of the analysis, the structure is reinforced, and the possibility of satisfying the performance can be increased. As a result, the possibility of judging that an expansion joint is unnecessary can be increased.

[0012] (3) In the above (1) or (2), in the step of determining whether the structure satisfies the target performance, if it is determined that the structure does not satisfy the target performance, at least one of the following may be performed: reducing the drying shrinkage rate of the concrete, reducing the linear expansion coefficient of the concrete, and resetting the specifications and position of the insulating material. In this case, after it is determined that the structure does not satisfy the performance, at least one of the following is performed: reducing the drying shrinkage rate, reducing the linear expansion coefficient, and resetting the specifications and position of the insulating material. Therefore, it is possible to increase the possibility that the structure satisfies the target performance when it is determined again whether the structure satisfies the target performance. As a result, it is possible to increase the possibility that it can be determined that an expansion joint is not necessary. Effect of the Invention

[0013] According to the present disclosure, it is possible to determine with high accuracy whether or not an expansion joint is required. [Brief description of the drawings]

[0014] [Figure 1] 4 is a flowchart showing an example of steps of a structure design method according to the embodiment. [Diagram 2] 1 is a graph showing an example of distribution of drying shrinkage strain. [Diagram 3] 1 is a graph showing an example of the relationship between drying period and drying shrinkage strain. [Figure 4] 1A to 1C are diagrams illustrating examples of analysis results of stress and deformation occurring in a member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the structure design method according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are given the same reference numerals, and duplicated descriptions are omitted as appropriate. The drawings may be partially simplified or exaggerated for ease of understanding, and the dimensional ratios and the like are not limited to those shown in the drawings.

[0016] In this embodiment, a structure design method that eliminates the need for expansion joints in the structure will be described. The "structure" is, for example, a long building, but may be a building other than a long building, and the type of structure is not particularly limited. In order to eliminate the need for expansion joints, it is desirable to reduce the long-term deformation of the structure. In the structure design method according to this embodiment, measures for reducing the long-term deformation of the structure are combined.

[0017] The structure design method according to the present embodiment is executed, for example, when designing a new structure, i.e., before constructing a new structure. Measures for reducing long-term deformation of a structure include reducing the drying shrinkage of the concrete of the structure, reducing the linear expansion coefficient of the concrete of the structure, and setting the specifications and location of external insulation. In the structure design method according to the present embodiment, the long-term strain of the members of the structure is predicted from the drying shrinkage of the concrete and annual temperature changes.

[0018] "Components" include columns, beams, walls, and floors that make up a structure. For example, in a structure design method, the long-term strain is input as data, and a stress analysis is performed on a three-dimensional analysis model in which columns and beams are wire elements and floors and walls are shell elements, to determine whether there are any points of stress concentration or points where the stress is excessive. Then, reinforcement is added as necessary.

[0019] A specific example of the structure design method according to this embodiment will be described below with reference to Fig. 1. Fig. 1 is a flow chart showing an example of steps of the structure design method according to this embodiment. As shown in Fig. 1, the drying shrinkage rate of the concrete constituting the structure is obtained (step of obtaining the drying shrinkage rate, step S1).

[0020] The drying shrinkage of concrete is strongly influenced by the aggregate of the concrete. As shown in Figure 2, the drying shrinkage of concrete (drying shrinkage strain) is distributed widely in the range of 500μ or more and 1000μ or less. For example, the drying shrinkage is obtained by JIS A 1129-3 "Method of measuring change in length of mortar and concrete - Part 3: Dial gauge method".

[0021] For example, to obtain the drying shrinkage rate, a 100mm x 100mm x 400mm rectangular prism-shaped concrete specimen is stored for 26 weeks in an environment with a temperature of 20±2°C and a humidity of 60±5%, and the change in length of the concrete specimen is measured during this time. For example, the change in length of the concrete specimen is measured 1 week, 2 weeks, 4 weeks, 8 weeks, 13 weeks, and 26 weeks after the start of storage.

[0022] In the present embodiment, in the step of acquiring the drying shrinkage ratio, the drying shrinkage ratio is acquired and reduced. In the reduction of the drying shrinkage ratio, for example, the drying shrinkage ratios of multiple types of concrete are measured, and the concrete having the smallest drying shrinkage ratio is selected from the multiple types of concrete. In this case, it contributes to the reduction of the drying shrinkage of the entire structure.

[0023] The drying shrinkage may be reduced by, for example, selecting a concrete containing aggregates with low shrinkage and / or by adding admixtures to the concrete, such as expansive or shrinkage-reducing admixtures that contribute to shrinkage reduction. The drying shrinkage may also be reduced by reducing the unit water content of the concrete.

[0024] For example, after the drying shrinkage rate is reduced, the drying shrinkage rate is acquired again. The drying shrinkage rate may be acquired by acquiring test data on drying shrinkage held by the ready-mix concrete plant. The acquired drying shrinkage rate is regarded as the drying shrinkage rate of the concrete to be used.

[0025] As shown in FIG. 1, the linear expansion coefficient of the concrete that constitutes the structure is obtained (step S2, a process for obtaining the linear expansion coefficient). The linear expansion coefficient of concrete is generally about 10μ / ℃. However, the linear expansion coefficient of concrete is strongly influenced by the aggregate, and may be 6μ / ℃ or more and 13μ / ℃ or less. The linear expansion coefficient of concrete is predominantly influenced by the linear expansion coefficient of the aggregate, which accounts for about 70% of the volume of concrete.

[0026] Therefore, the linear expansion coefficient of concrete is obtained by, for example, identifying the type of aggregate of the concrete. The linear expansion coefficient of concrete may also be obtained by a linear expansion coefficient test. The linear expansion coefficient indicates the deformation caused by a 1°C change in temperature, and from the viewpoint of reducing deformation of a long building caused by temperature changes, it is desirable to use concrete with a small linear expansion coefficient.

[0027] In this embodiment, in the step of acquiring the linear expansion coefficient, the linear expansion coefficient is acquired and reduced. In the reduction of the linear expansion coefficient, for example, a concrete having the smallest linear expansion coefficient of aggregate is selected from a plurality of types of concrete. As a specific example, the linear expansion coefficient may be reduced by selecting a concrete having an aggregate having a smaller linear expansion coefficient from a plurality of types of concrete whose aggregate linear expansion coefficients have been acquired in advance by a ready-mixed concrete plant. Alternatively, the linear expansion coefficient may be reduced by selecting a ready-mixed concrete plant that manufactures a concrete having an aggregate with a smaller linear expansion coefficient.

[0028] For example, when concrete is poured on-site to build a structure, a ready-mixed concrete plant using aggregate with a small linear expansion coefficient is selected from among ready-mixed concrete plants in the vicinity of the site. However, if the site is located in an area with few crushed stone plants, there may be few ready-mixed concrete plants in the area, and it may not be possible to select a ready-mixed concrete plant using aggregate with a small linear expansion coefficient. In contrast, at a site where precast concrete is delivered to build a structure, there is no restriction on the transportation time of ready-mixed concrete, and ready-mixed concrete plants can be selected from a relatively wide area, which has the advantage of increasing the options.

[0029] In addition, the specifications (e.g., type) of the insulation material constituting the structure and the position of the insulation material are set (setting process, step S3). For example, the material of the insulation material and the thickness of the insulation material are set as the specifications of the insulation material. For example, the location of the insulation material in the structure where the insulation material is applied is set as the position of the insulation material. By reducing the deformation of the structure's framework, it is possible to reduce the stress generated in a long building. In order to reduce the deformation of the framework, it is desirable to reduce the strain due to drying shrinkage (this strain is referred to as the first strain) and the strain due to temperature change (this strain is referred to as the second strain), which are the driving forces of deformation.

[0030] For example, the deformation of the skeleton is the deformation of the skeleton in the longitudinal direction of a long building, and is obtained by a stress analysis using the deformation of the beams, walls, and floors as inputs and a three-dimensional analysis model described later. In order to suppress distortion due to temperature changes in the skeleton, it is effective to reduce the temperature change of the skeleton. In order to reduce temperature changes in the skeleton, external insulation, in which insulation material is installed on the outside of the skeleton, is more effective than internal insulation, in which insulation material is installed on the inside of the skeleton. However, if for some reason external insulation cannot be selected and only internal insulation can be selected, the temperature change of the skeleton may be calculated under the condition of internal insulation, for example.

[0031] When setting the insulation material specifications, for example, Type A extruded polystyrene foam insulation board type 3 bA, rigid polyurethane foam insulation type 2 No. 2A, or phenol foam insulation type 1 No. 2 CI may be set. When setting the insulation material specifications, an insulation material with a thermal conductivity of a certain value or more (for example, 0.020 W (m K)) may be selected. When setting the location of the insulation material, for example, above the ceiling slab, where the building structure temperature is likely to rise due to the effects of outside air temperature and solar radiation, is set. In this case, external insulation can be performed above the ceiling slab, where there is a concern of temperature rise.

[0032] After the drying shrinkage ratio is obtained, a first strain, which is a strain caused in a member constituting a structure by drying shrinkage of concrete, is predicted from the drying shrinkage ratio (step S4 of predicting the first strain). The first strain is used as input data for a stress analysis using a three-dimensional analysis model that analyzes deformation due to drying shrinkage of a long building, for example.

[0033] For example, as shown in Figure 3, as the volume-surface area ratio (V / S) of a component increases, the volume (V) of the component increases relative to its surface area (S), and the progression of drying shrinkage strain slows down. In the following, an example of a method for calculating the first strain from the drying shrinkage ratio using formulas (1) to (4) will be described. Formulas (1) to (4) are based on the guidelines of the Architectural Institute of Japan. The shrinkage strain at the start of drying at age t0 and at age t days (×10 -6 ) to ε sh (t,t0), the final shrinkage strain is ε sh∞ Then, ε sh (t,t0) and ε sh∞ can be calculated using the following equations (1) and (2).

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[0034] In the above formulas (1) and (2), h is the relative humidity (%), V is the volume of the material (mm 3 ), S is the surface area of ​​the material exposed to the outside air (mm 2 ), V / S is the volume-surface ratio of the component. K1 and K4 can be calculated using the following formulas (3) and (4).

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[0035] As shown in FIG. 1, after the linear expansion coefficient of concrete is obtained, the specifications of the insulation material are set, and the position of the insulation material is set, the second strain, which is the strain caused in the component due to temperature change, is predicted from the linear expansion coefficient of concrete, the specifications of the insulation material, and the position of the insulation material (step of predicting the second strain, step S5). For example, the second strain caused in the component due to annual temperature change is predicted. In predicting the second strain, the temperature change of the building structure is predicted from the indoor temperature due to air conditioning, the outdoor temperature, solar radiation, the type of insulation material, and the position of the insulation material. The temperature change of the building structure can be predicted by a known method. Then, the temperature change of the building structure is multiplied by the linear expansion coefficient to calculate the second strain, which is the temperature strain.

[0036] After predicting the first strain and the second strain, the first strain and the second strain are input to analyze the stress and deformation occurring in the member (analysis process, step S6). In this analysis, for example, an elastic shrinkage analysis is performed. In the elastic shrinkage analysis, a three-dimensional analysis model is used in which the columns and beams are wire elements, the floors and walls are shell elements, and horizontal springs are provided at the supports using piles.

[0037] Then, strain is input to the horizontal member elements that make up the three-dimensional analysis model, and the stress and deformation that occurs in each member due to concrete shrinkage is calculated. Elastic shrinkage analysis is performed to determine the location where shrinkage stress occurs, as well as the stress and deformation. The strain to be input is, for example, the sum of the first strain (drying shrinkage strain) and the second strain (temperature strain) for each member. Note that when inputting strain, the rigidity of the member and the effects of creep or cracks in the member may also be taken into consideration.

[0038] Fig. 4 shows an example of the results of an analysis of the stress and deformation occurring in a member 2 of a structure 1. In the example of Fig. 4, areas where tensile stress is large are colored gray. After the analysis of the stress and deformation occurring in the member 2 is performed, the deformation angles at the portion 3 where the tensile stress is concentrated and at the end of the structure 1 where strain accumulates are calculated, and it is determined whether the calculated deformation angle is within a predetermined range (step S7).

[0039] If it is determined in step S7 that the calculated deformation angle is not within a predetermined range, the process proceeds to steps S1, S2, and S3, for example. On the other hand, if it is determined in step S7 that the calculated deformation angle is within a predetermined range, it is determined whether or not the structure 1 has any points of stress concentration or any points where stress is excessive (a process of determining whether or not there are any points of stress concentration or any points where stress is excessive, step S8).

[0040] The judgment in step S8 is made based on the stress distribution in the structure 1 obtained as a result of the analysis in step S6. If it is judged in step S8 that there are areas of stress concentration or areas where the stress is excessive, reinforcement is added to the member 2 (a process of adding reinforcement, step S9). This addition of reinforcement is performed in a simulation. After the addition of reinforcement, the process proceeds to step S10.

[0041] If it is determined in step S8 that there are no points of stress concentration or points where the stress is excessive, the process proceeds to step S10. In step S10, it is determined whether or not the structure 1 satisfies the target performance (a process for determining whether or not the performance is satisfied). For example, it is determined that the performance is satisfied when the stress of the member 2 obtained by the elastic shrinkage analysis is equal to or lower than the allowable strength of the member 2 set by the designer (for example, equal to or lower than the long-term allowable stress).

[0042] If it is determined in step S10 that the target performance is met, the series of steps ends. At this time, it can be determined that it is not necessary to install expansion joints in the structure 1. On the other hand, if it is determined in step S10 that the target performance is not met, the process proceeds to steps S1, S2, and S3. Then, the drying shrinkage rate of the concrete is reduced, the linear expansion coefficient of the concrete is reduced, and the specifications and position of the insulation material are reset.

[0043] When proceeding to steps S1, S2, and S3, it is not necessary to execute all of the steps of reducing the drying shrinkage rate of concrete, reducing the linear expansion coefficient of concrete, and resetting the specifications and the position of the insulating material. That is, only one or two of steps S1, S2, and S3 may be executed. For example, when it is determined that the target performance is not satisfied even after executing steps S1, S2, and S3 multiple times, it may be determined that an expansion joint needs to be installed in the structure 1.

[0044] Next, the effects obtained from the structure design method according to this embodiment will be described. In this structure design method, the drying shrinkage rate of the concrete constituting the structure 1 is acquired, and a first strain, which is a strain caused in the member 2 due to the drying shrinkage of the concrete, is predicted from the drying shrinkage rate. A second strain, which is a strain caused in the member 2 due to temperature change, is predicted from the linear expansion coefficient of the concrete constituting the structure 1, the specifications of the insulation material, and the position of the insulation material. Then, an analysis is performed on the stress and deformation caused in the member 2 from the first strain and the second strain, and it is determined from the results of this analysis whether the structure 1 satisfies the target performance.

[0045] By determining whether or not the performance is satisfied from the analysis results of the stress and deformation obtained using the first strain caused in member 2 by drying shrinkage and the second strain caused in member 2 by temperature change, it is possible to determine whether or not an expansion joint is required, taking drying shrinkage and temperature change into consideration. In other words, if it is determined that the performance is satisfied based on the effects of drying shrinkage and temperature change that may occur in structure 1, it can be determined that an expansion joint is not required, and if it is determined that the performance is not satisfied, it can be determined that an expansion joint is required. Therefore, it is possible to determine with high accuracy whether or not an expansion joint is required.

[0046] In this embodiment, the structure design method includes a step of determining whether or not the structure 1 has any points of stress concentration or any points where stress becomes excessive based on the stress distribution of the structure 1 obtained as a result of the analysis, and a step of adding reinforcing bars to the member 2 when it is determined that the structure 1 has any points of stress concentration or any points where stress becomes excessive. After the step of adding reinforcing bars to the member 2, a step of determining whether or not the structure 1 satisfies a target performance is executed.

[0047] In this case, the analysis results are used to determine whether or not there are any points of stress concentration or points where stress is excessive in the structure 1, and reinforcing bars are added when it is determined that there are any points of stress concentration or points where stress is excessive. Therefore, by adding reinforcing bars as necessary based on the analysis results, the structure 1 is reinforced, increasing the possibility of satisfying performance.

[0048] As a result, it is possible to increase the possibility of determining that expansion joints are not necessary, thereby suppressing the increase in cost or construction time due to the installation of expansion joints, and avoiding the problem that the location where the expansion joint is installed becomes a weak point in terms of waterproofing. In this embodiment, it is possible to realize a long building of over 100 m that does not require expansion joints.

[0049] In this embodiment, in the step of determining whether the structure 1 satisfies the target performance, if it is determined that the structure 1 does not satisfy the target performance, at least one of the following may be performed: reducing the drying shrinkage rate of the concrete, reducing the linear expansion coefficient of the concrete, and resetting the specifications and position of the insulating material. In this case, after it is determined that the structure 1 does not satisfy the performance, at least one of the following is performed: reducing the drying shrinkage rate, reducing the linear expansion coefficient, and resetting the specifications and position of the insulating material.

[0050] Therefore, when it is judged again whether the structure 1 satisfies the target performance, the possibility that the performance will be satisfied can be increased. As a result, the possibility of determining that the expansion joint is unnecessary can be increased. Therefore, as in the above, it is possible to suppress the increase in cost and construction time caused by installing the expansion joint, and to avoid the problem that the location where the expansion joint is installed becomes a weak point in terms of waterproofing.

[0051] The above describes the embodiment of the structure design method according to the present disclosure. However, the structure design method according to the present disclosure is not limited to the contents of the above-mentioned embodiment, and may be modified within the scope of the gist described in the claims. In other words, the contents and order of the steps of the structure design method according to the present disclosure can be appropriately changed within the scope of the above gist.

[0052] In the above-described embodiment, an example of determining whether an expansion joint is required in the structure 1 has been described. However, in the structure design method according to the present disclosure, it is not necessary to determine whether an expansion joint is required. In the following, an example of applying the structure design method according to the present disclosure to a long building having a seismic isolation structure will be described.

[0053] Long buildings with seismic isolation structures are equipped with multiple seismic isolation devices. The seismic isolation devices have laminated rubber. The structure above the seismic isolation layer expands and contracts due to temperature strain caused by annual temperature changes or drying shrinkage strain, and the structure above the seismic isolation device may deform horizontally while the lower part of the seismic isolation device remains stationary. When this happens, the difference in horizontal displacement between the upper and lower parts of the seismic isolation device may become too large, causing a problem that the expected effect of the seismic isolation device cannot be achieved. Therefore, an upper limit for the difference in horizontal displacement between the upper and lower parts of the seismic isolation device is set for each type of seismic isolation device.

[0054] In the structure design method according to the present disclosure, it is possible to examine in advance whether the horizontal displacement difference between the upper and lower parts of the seismic isolation device caused by shrinkage of the structure due to drying shrinkage and temperature change will be equal to or less than a predetermined value. For example, in FIG. 1, steps S1 to S6 are executed to perform a stress analysis of a three-dimensional analysis model, and then the target performance is confirmed in step S10.

[0055] In checking the target performance, the horizontal displacement difference between the upper and lower parts of the seismic isolation device is calculated, and if the calculated horizontal displacement difference is equal to or less than the upper limit value set for each seismic isolation device, it is determined that the target performance is satisfied. In this way, the structure design method according to the present disclosure can be applied to structures equipped with a seismic isolation structure.

[0056] In the above-described embodiment, an example was described in which at least one of the following is performed: reducing the drying shrinkage rate of concrete, reducing the linear expansion coefficient of concrete, and resetting the specifications and position of the insulating material. However, in a case in which the drying shrinkage rate, the linear expansion coefficient, and the specifications and position of the insulating material satisfy the performance from the beginning, at least one of the following may not be performed: reducing the drying shrinkage rate, reducing the linear expansion coefficient, and resetting the specifications and position of the insulating material. In addition, in the above-described embodiment, a structure design method applied to a long building was described. However, the structure design method according to the present disclosure can also be applied to buildings other than long buildings, or structures other than buildings. [Explanation of symbols]

[0057] 1...structure, 2...component, 3...part.

Claims

1. A structure design method for designing a structure, comprising the steps of: Obtaining a drying shrinkage rate of concrete constituting the structure; A step of predicting a first strain, which is a strain caused in a member constituting the structure due to drying shrinkage of the concrete, from the drying shrinkage rate; Obtaining the linear expansion coefficient of the concrete; A step of setting specifications of the insulation material constituting the structure and a position of the insulation material; A step of predicting a second strain, which is a strain caused in the member due to a temperature change, from the linear expansion coefficient of the concrete, the specifications of the insulating material, and the position of the insulating material; inputting the first strain and the second strain to analyze stress and deformation occurring in the member; determining whether the structure satisfies a target performance based on a result of the analysis; Equipped with Structure design method.

2. a step of determining whether or not the structure has any points of stress concentration or points of excessive stress based on the stress distribution of the structure obtained as a result of the analysis; adding a reinforcing bar to the member when it is determined that there is a stress concentration area or an excessively large stress area; Equipped with After the step of adding reinforcing bars to the member, a step of determining whether the structure satisfies a target performance is carried out. The structure design method according to claim 1 .

3. In the step of judging whether the structure satisfies a target performance, when it is judged that the structure does not satisfy the target performance, at least one of reducing the drying shrinkage rate of the concrete, reducing the linear expansion coefficient of the concrete, and resetting the specifications of the insulating material and the position of the insulating material is executed. The structure design method according to claim 1 or 2.

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