Design Support Method and Design Support System

Abstract

To provide a design support method and a design support system capable of performing an appropriate design using an existing foundation.SOLUTION: A control part 21 of a design support server 20 acquires actual strength acquired from an investigation regarding concrete used for an existing pile and design reference strength of the concrete of the existing pile, from a designer terminal 10. The control part 21 acquires a switching line for specifying a design method adopted corresponding to the acquired design reference strength, specifies the design method by a comparison result of an average value of the actual strength and the switching line, and sets and outputs material strength of the existing pile based on the design method.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a design support method and a design support system for designing a new building using an existing foundation such as an existing pile.

Background Art

[0002] Sometimes, a new building is constructed by reusing a part of an existing building. In this case, the design drawings and construction records of the existing building are checked. Then, for the reused part (for example, an existing pile), the deterioration of the properties (mainly strength) of concrete, steel bars, etc. over time is investigated, and the reuse method is selected after confirming the performance and quality. In this investigation, it is confirmed that the design standard strength and specifications of the existing pile are satisfied.

[0003] In addition, an evaluation of the design of the existing building is also carried out (see, for example, Non-Patent Document 1 and Patent Document 1). Non-Patent Document 1 and Patent Document 1 describe a design support method for reducing the allowable stress by the investigated quantity when reusing an existing pile or the like.

[0004] Furthermore, regarding the material strength of the concrete of the existing building, there is a method of setting the material strength for seismic diagnosis using the average and standard deviation of the concrete compressive strength obtained by the investigation (see, for example, Non-Patent Document 2). Also, in the regulations of JIS and JASS5 (Non-Patent Document 3), it is shown that concrete with an increased strength (mixing strength) is placed in consideration of the variation, which is higher than the design standard strength.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Non-Patent Documents

[0006]

Non-Patent Document 1

Non-Patent Document 2

Non-Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, neither Non-Patent Document 1 nor Patent Document 1 describes the calculation method of the material strength itself used for stress calculation. Therefore, the calculation of the material strength needs to be calculated by some other method separately.

[0008] Also, as described above, several methods have been considered for setting the material strength. However, when the material strength of the concrete of the existing pile is set low using a design method considering safety, a design that ensures more strength than necessary will be carried out, making it difficult to construct an efficient structure.

[0009] Furthermore, the calculation method of the material strength described in Non-Patent Document 2 is for the superstructure, and it is not clear whether it can be directly applied to the foundation, which is the substructure. In addition, the relationship between the material strength in Non-Patent Document 2 and the mixing strength of the concrete actually placed with respect to the design standard strength in Non-Patent Document 3 was also unclear.

Means for Solving the Problems

[0010] The design support method for solving the above problems is a design support method for designing a new building using an existing foundation. The actual strength obtained from an investigation of the concrete used in the existing foundation and the design standard strength of the concrete of the existing foundation are acquired. A curve for determining a setting method adopted with the index indicating the variation in the actual strength on the x-axis and the representative value of the actual strength on the y-axis, For the acquired design standard strength responding a determination curve is acquired. Using the obtained determination curve, calculated from the obtained actual strength The representative value of the actual strength and from the index indicating the variation in the actual strength is specified, and based on the specified method, the material strength of the existing foundation for designing the new building is set and output.

Advantages of the Invention

[0011] According to the present invention, a reasonable design using an existing foundation can be performed.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

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Figure 9

Modes for Carrying Out the Invention

[0013] Hereinafter, an embodiment in which a design support method and a design support system are embodied will be described with reference to FIGS. 1 to 9. In this embodiment, a new building is designed using existing piles as existing foundations used in existing buildings. As shown in FIG. 1, the design support system uses a designer terminal 10 and a design support server 20 connected via a network.

[0014] (Hardware configuration example) FIG. 2 is an example of the hardware configuration of an information processing apparatus H10 that functions as the designer terminal 10, the design support server 20, and the like.

[0015] The information processing apparatus H10 includes a communication apparatus H11, an input apparatus H12, a display apparatus H13, a storage apparatus H14, and a processor H15. Note that this hardware configuration is an example, and it may have other hardware.

[0016] The communication apparatus H11 is an interface that establishes a communication path with other apparatuses and executes data transmission and reception, and is, for example, a network interface or a wireless interface.

[0017] The input apparatus H12 is an apparatus that receives input from a user or the like, and is, for example, a mouse or a keyboard. The display apparatus H13 is a display or a touch panel that displays various information.

[0018] The storage apparatus H14 is a storage apparatus (for example, a setting method storage unit 22, a determination graph storage unit 23, and an investigation information storage unit 24 described later) that stores data and various programs for executing various functions of the designer terminal 10 and the design support server 20. Examples of the storage apparatus H14 include a ROM, a RAM, and a hard disk.

[0019] The processor H15 controls each process (for example, the process in the control unit 21 described later) in the designer terminal 10 and the design support server 20 by using programs and data stored in the storage device H14. Examples of the processor H15 include, for example, a CPU, an MPU, etc. This processor H15 expands a program stored in a ROM or the like to a RAM and executes various processes corresponding to various processes. For example, when the application programs of the designer terminal 10 and the design support server 20 are started, the processor H15 operates a process that executes each process described later.

[0020] The processor H15 is not limited to performing software processing for all processes it executes. For example, the processor H15 may include a dedicated hardware circuit (for example, an application-specific integrated circuit: ASIC) that performs hardware processing for at least a part of the processes it executes. That is, the processor H15 may be configured as follows.

[0021] (1) One or more processors that operate according to a computer program (software) (2) One or more dedicated hardware circuits that execute at least a part of various processes, or (3) A combination thereof, including circuitry

[0022] The processor includes a CPU and memories such as a RAM and a ROM, and the memories store program codes or instructions configured to cause the CPU to execute processes. The memory, that is, the computer-readable medium, includes any available medium that can be accessed by a general-purpose or dedicated computer.

[0023] (Functions of the Designer Terminal 10 and the Design Support Server 20) The designer terminal 10 in FIG. 1 is a computer terminal used by a person in charge (designer) who designs a new building using existing piles.

[0024] The design support server 20 is a computer system for supporting the designs of designers. This design support server 20 includes a control unit 21, a setting method storage unit 22, a determination graph storage unit 23, and an investigation information storage unit 24.

[0025] The control unit 21 performs processes (processes including a determination graph creation stage, an actual strength acquisition stage, a setting method identification stage, a design process stage, etc.) described later. By executing a design support program for this purpose, the control unit 21 functions as a determination graph creation unit 210, an actual strength acquisition unit 211, a setting method identification unit 212, a design process unit 213, etc.

[0026] The determination graph creation unit 210 executes a process of generating a determination graph. This determination graph is used to identify a setting method adopted for setting the material strength. The actual strength acquisition unit 211 executes a process of acquiring the actual strength of the concrete of the existing piles to be reused.

[0027] The setting method identification unit 212 executes a process of identifying the setting method of the material strength using the acquired actual strength and the determination graph recorded in the determination graph storage unit 23. For this purpose, the setting method identification unit 212 stores calculation formulas for the average value, standard deviation, and coefficient of variation of the actual strength. The average value of the actual strength is an index indicating an intermediate value of the actual strength of the target data. The standard deviation is an index indicating the variation of each actual strength. The coefficient of variation is an index indicating the variation and is calculated by dividing the standard deviation by the average value of the actual strength. The design process unit 213 executes a process of setting the material strength of the existing piles using the identified setting method and designing a new building using (outputting) the set material strength.

[0028] As shown in FIG. 3, the setting method storage unit 22 stores a plurality of setting methods used for setting the material strength of the existing pile concrete. In this embodiment, the set material strength is used for the design of a new building using the existing pile. The setting method storage unit 22 stores a first setting method 221 and a second setting method 222. Here, the first setting method 221 is a method for calculating the material strength according to the RC seismic diagnosis standard. This material strength is set according to the applicable range of the actual strength of the existing pile. Specifically, when the investigated actual strength Xi is equal to or greater than the design standard strength, and the value obtained by subtracting the standard deviation σ from the average value Xmean of the actual strength is equal to or greater than the design strength standard Fc (when Xmean - σ ≧ Fc), the minimum value among the following is adopted as the material strength. (1) Xmean - σ (2) 1.5 × Fc (3) 36 N / mm 2

[0029] When designing an existing pile, since the actual strength of the existing pile is large and the variation is small, the value obtained by subtracting the standard deviation σ from the average value Xmean of the actual strength is equal to or greater than the design strength standard Fc. Therefore, in this embodiment, when calculating the material strength according to the RC seismic diagnosis standard, the material strength under this condition (when Xmean - σ ≧ Fc) is adopted.

[0030] Also, when the investigated actual strength Xi is equal to or greater than the design standard strength Fc, and Xmean - σ < Fc and Xmean - σ / 2 ≧ Fc, the minimum value among the three values of Xmean - σ / 2, 1.25 × Fc, and 30 N / mm 2 is adopted as the material strength. Further, when the actual strength Xi is equal to or greater than the design standard strength Fc and Xmean - σ / 2 < Fc, Xmean - σ / 2 is adopted as the material strength.

[0031] Also, the second setting method 222 is a method for calculating the material strength using the actual strength of the existing pile in accordance with JIS·JASS5 regulations. This material strength is the value obtained by dividing the average value of the actual strength by the multiplication factor, and the multiplication factor is the ratio of the concrete mixing strength F (N / mm 2 ) to the concrete mixing control strength Fm (N / mm2 ) is the value obtained by dividing by. Here, as the concrete mixing control strength Fm, the design standard strength Fc is used. Also, the mixing strength F is set so as to satisfy both of the following equations (1) and (2). F≧0.85Fm+3σ …(1) F≧Fm+1.73σ …(2) Here, σ is the standard deviation of the compressive strength of the concrete to be used.

[0032] As shown in FIG. 4, in the determination graph storage unit 23, the determination graph data 230 created by the determination graph creation unit 210 is recorded. This determination graph data 230 includes switching lines L15, L18, and L21 as determination curves. The switching lines L15, L18, and L21 are recorded corresponding to the design standard strengths Fc15, Fc18, and Fc21 of the existing piles, respectively. Each switching line is a line for switching the application of the first setting method 221 and the second setting method 222 (a boundary line for changing the setting method). In the present embodiment, when the average value (Xmean) of the actual strength is higher than each of the switching lines L15 to L21, the material strength is calculated using the RC seismic diagnosis standard which is the first setting method 221. Also, when the average value (Xmean) of the actual strength is lower than each of the switching lines L15 to L21, the material strength is calculated using the JIS·JASS5 regulations which are the second setting method 222.

[0033] As shown in FIG. 5, in the investigation information storage unit 24, the investigation management data 240 regarding the existing piles investigated for reuse is recorded. The investigation management data 240 is registered when the investigation results in the concrete members constituting the existing piles are obtained. The investigation management data 240 includes data regarding the site identifier, investigation identifier, investigation location, design standard strength, actual strength, and material strength to be adopted.

[0034] In the site identifier data area, data regarding the identifier for specifying the site of the existing pile investigated is recorded. In the investigation identifier data area, data regarding the identifier for specifying each investigation result is recorded.

[0035] In the survey location data area, the survey location data of the surveyed concrete is recorded. In this embodiment, the survey location data includes an existing pile identifier and location information. The existing pile identifier is an identifier for specifying an existing pile. The location information is information for specifying the location where the concrete was surveyed in this existing pile, for example, the pile head, the pile bottom, etc.

[0036] In the design standard strength data area, data regarding the design standard strength Fc of this existing pile is recorded. This design standard strength Fc is the strength used when this existing pile was designed as a newly constructed pile. In the actual strength data area, data regarding the strength of the concrete (actual strength) actually obtained from the survey results for this existing pile is recorded.

[0037] In the material strength data area to be adopted, data regarding the material strength set when designing a new building using this existing pile is recorded. This material strength records the material strength of the existing pile calculated using the specified setting method (RC seismic diagnosis standard or JIS·JASS5 regulations).

[0038] (Determination graph generation process) Next, with reference to FIGS. 6 to 8, the details of the determination graph generation process will be described. Here, the case where the design standard strength is Fc18 will be described. For the design standard strengths Fc = 15 and 21, a similar process in which the design standard strength Fc at Fc18 is changed is performed to generate a determination graph, which is then recorded in the determination graph storage unit 23.

[0039] As shown in FIG. 6, the following process is repeated for each average value of the actual strength. Here, as the average value of the actual strength, for example, values obtained by continuously changing the magnification from 1.0 times to 3.0 times of the design standard strength Fc by 0.1 each are sequentially specified as the strength to be processed. Then, the following process is performed on the specified strength to be processed.

[0040] The control unit 21 of the design support server 20 executes a graph creation process for the material strength (adopted material strength) adopted according to the RC seismic diagnosis standard (step S11). Here, the adopted material strength curve is generated using the first setting method 221. Details of this process will be described later.

[0041] Next, the control unit 21 of the design support server 20 executes a graph creation process for the adopted material strength according to JIS·JASS5 regulations (step S12). Specifically, the same process as in step S11 is executed using the second setting method 222 instead of the first setting method 221 in step S11 to generate the adopted material strength curve. The above process is repeated for each average value of the actual strength.

[0042] Figures 7(a) to (c) show the adopted material strength curves when the average value of the actual strength is 1.5 times, 2.0 times, and 2.5 times the design reference strength Fc in the case of the design reference strength Fc18. In each figure, the adopted material strength curve according to the RC seismic diagnosis standard calculated in step S11 is shown as a solid line, and the adopted material strength curve according to JIS·JASS5 regulations calculated in step S12 is shown as a dotted line.

[0043] Next, the control unit 21 of the design support server 20 executes a switching line creation process (step S13). Specifically, the determination graph creation unit 210 of the control unit 21 acquires the value of the intersection point (coefficient of variation at the intersection point) between the adopted material strength curve according to the RC seismic diagnosis standard and the adopted material strength curve according to JIS·JASS5 regulations for each average value of the actual strength, together with the average value of the actual strength. Then, the determination graph creation unit 210 plots this intersection point value (coefficient of variation) on a graph with the horizontal axis being the intersection point value and the vertical axis being the average value of the actual strength, and generates a switching line by smoothly connecting them.

[0044] Figure 7(d) shows the switching line L18 generated by plotting the intersection point values of Figures 7(a) to (c) and connecting the plotted values with a curve. In this figure, a plurality of representative values (average values of the actual strength) that are easy to form the switching line L18 are plotted and displayed at a coefficient of variation of 0% to 20%. Then, the determination graph data including the generated switching line is recorded in the determination graph storage unit 23. In this case, the switching line L18 is recorded in association with the design reference strength (here, Fc18).

[0045] (Graph creation process for adopted material strength) Next, with reference to FIG. 8, the graph creation process for the adopted material strength according to the RC seismic diagnosis criteria in step S11 described above will be explained.

[0046] First, the determination graph creation unit 210 of the control unit 21 executes the following calculation process for the adopted material strength for each coefficient of variation. In this case, values obtained by increasing the coefficient of variation by 1% sequentially from 1% to 20% are specified. Then, using the specified coefficient of variation, the average value of the actual strength, and the first setting method 221, the adopted material strength in the RC seismic diagnosis criteria is calculated. As a result, for example, in FIG. 7(a), the adopted material strength (the value on the vertical axis of each black circle point) using the RC seismic diagnosis criteria corresponding to each coefficient of variation (horizontal axis) is calculated.

[0047] When the adopted material strength has been calculated for all up to a coefficient of variation of 20%, the determination graph creation unit 210 of the control unit 21 generates an adopted material strength curve (step S22). Specifically, the determination graph creation unit 210 plots the adopted material strength of each coefficient of variation calculated in step S21 and smoothly connects them to generate an adopted material strength curve according to the RC seismic diagnosis criteria.

[0048] (Design process) Next, with reference to FIG. 9, the design process for designing a new building using existing piles will be explained. First, the control unit 21 of the design support server 20 executes a process of acquiring the actual strength of existing piles at the site (step S31). Specifically, the actual strength acquisition unit 211 of the control unit 21 acquires the actual strength of the concrete of the surveyed existing piles via the input device H12 of the designer terminal 10. In this case, the actual strength acquisition unit 211 acquires the site identifier that identifies the site of the surveyed existing piles, the survey position of the concrete of the existing piles (pile identifier and position information of the surveyed pile), and the design standard strength in association. The actual strength acquisition unit 211 assigns a survey identifier to the acquired actual strength, generates survey management data 240 including this survey identifier, and records it in the survey information storage unit 24. Further, the actual strength acquisition unit 211 includes the acquired site identifier, survey position, design standard strength, and actual strength in this survey management data 240.

[0049] Next, the control unit 21 of the design support server 20 executes a process of calculating the average value, standard deviation, and coefficient of variation of the concrete actual strength (step S32). Specifically, the setting method identification unit 212 of the control unit 21 extracts the survey management data 240 having the same site identifier from the survey information storage unit 24. Then, the setting method identification unit 212 calculates the average value, standard deviation, and coefficient of variation of the actual strength using the actual strength of the extracted survey management data 240.

[0050] Next, the control unit 21 of the design support server 20 executes a process of plotting the average value of the actual strength against the coefficient of variation (step S33). Specifically, the setting method identification unit 212 of the control unit 21 plots the coefficient of variation and the average value of the actual strength calculated in step S32 on a graph with the coefficient of variation on the horizontal axis and the average value of the actual strength on the vertical axis.

[0051] Next, the control unit 21 of the design support server 20 executes a process of identifying the setting method by comparing with the determination graph (step S34). Specifically, the setting method identification unit 212 of the control unit 21 acquires the switching line associated with the design strength standard acquired in step S31 from the determination graph storage unit 23.

[0052] Then, the setting method specifying unit 212 determines whether the position specified in step S33 is above or below the obtained switching line. Here, when the setting method specifying unit 212 determines that it is above the switching line and on the switching line, it specifies the first setting method (RC seismic diagnosis standard). Also, when the setting method specifying unit 212 determines that it is below the switching line, it specifies the second setting method (specified by JIS·JASS5).

[0053] For example, as shown in FIG. 9, when the position P1 is specified, since this position P1 is above the switching line L1, the setting method specifying unit 212 specifies that the first setting method (RC seismic diagnosis standard) is used.

[0054] Next, the control unit 21 of the design support server 20 executes design processing using the specified setting method (step S35). Here, first, the control unit 21 calculates the material strength to be adopted in the specified setting method. Specifically, when the specified setting method is the first setting method, the design processing unit 213 of the control unit 21 calculates the material strength using the first setting method 221. Also, when the specified setting method is the second setting method, the design processing unit 213 calculates the material strength using the second setting method 222.

[0055] Then, the design processing unit 213 records the calculated material strength in the material strength data area of the survey management data 240 used for the calculation. Next, the design processing unit 213 of the control unit 21 outputs the material strength recorded in the survey management data 240 as the material strength of the existing pile to the designer terminal 10. Then, the designer uses the designer terminal 10 to design a new building using the material strength of the existing pile output to the display device H13, the storage device H14, etc.

[0056] (Function) In this embodiment, a design calculation method for calculating the material strength to be adopted using the actual strength obtained from the survey results is specified. Thereby, the survey results can be effectively utilized to set the material strength according to the actual strength.

[0057] According to this embodiment, the following effects can be obtained. (1) In this embodiment, a setting method to be adopted is specified by using the average value Xmean of the actual strength Xi of the concrete of the existing piles obtained from the survey results and the design standard strength Fc. Thereby, after appropriately setting the material strength by using the survey results, a new building using the existing piles can be designed. For this reason, when the actual strength of the concrete of the existing piles is large, it is not necessary to set low the decrease in the concrete properties due to the change over time, so the design of the new building can be designed according to the actual strength of the existing piles.

[0058] (2) In this embodiment, it is specified whether the position based on the actual strength and the coefficient of variation of the concrete of the existing foundation obtained from the survey results is located above or below the previously created switching line L1. Thereby, an appropriate setting method can be specified quickly.

[0059] (3) In this embodiment, the setting method is specified by using the coefficient of variation of the concrete of the existing piles for each site. Thereby, since a setting method on the safe side can be adopted, an accurate setting method can be applied in consideration of the variation.

[0060] (4) In this embodiment, when the variation in the actual strength of the concrete of the existing foundation is large, the material strength is set according to the JIS·JASS5 regulations. Thereby, when the variation in the actual strength of the existing piles is large, it is possible to design on the safe side.

[0061] This embodiment can be implemented by making the following changes. This embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range. ·In the above embodiment, the design support server 20, which is the information processing apparatus H10, specified the setting method using the actual strength of the concrete and the determination graph. The specification of the setting method using the determination graph may be performed not only by a computer but also by a person. In this case, the calculation formula of the specified setting method may be output and presented to the person, or the material strength calculated using the specified setting method may be output and presented. Further, the specified setting method may be recorded in the investigation management data 240.

[0062] ·In the above embodiment, the coefficient of variation was calculated using the investigation management data 240 for each site having the same site identifier, and the material strength to be adopted was specified. The coefficient of variation is not limited to the case of being calculated for each site. For example, when constructing a plurality of new buildings at the same site, the coefficient of variation may be calculated using the existing piles used for one new building, and the setting method may be determined for each new building using this coefficient of variation.

[0063] ·In the above embodiment, the setting method was specified using the actual strengths of a plurality of existing piles. The setting method for calculating the material strength may be specified using the actual strength from one investigation result. In this case, even if only one acquired actual strength is available, among the two setting methods, the safer setting method can be quickly specified to determine the material strength.

[0064] ·In the above embodiment, the average value of the actual strength was used as an index indicating an intermediate value of the actual strength of the target data to specify the setting method. The representative value of the actual strength is not limited to the average value of the actual strength, and the mode value or the like may be used. Further, instead of using the coefficient of variation, other indexes indicating the variation of the actual strength of the concrete may be used.

[0065] ·In the above embodiment, the material strength of the existing piles was set. The target for setting the material strength is not limited to the existing piles and may be applied to other existing foundations. · In the above embodiment, either one of the two setting methods is adopted as the setting method. The adopted setting method is not limited to the two setting methods. For example, when a more appropriate setting method is devised, a determination graph including a plurality of determination curves for specifying the range of using a suitable setting method among the three setting methods for one design reference strength may be used based on the actual strength of the concrete and the design reference strength.

[0066] Next, the technical ideas that can be grasped from the above embodiment and the alternative example are added below. (a) The determination curve records the variation in the actual strength of the concrete of the existing foundation, the design reference strength, and the setting method corresponding to the actual strength. The design support method according to claim 1, wherein the setting method is specified using a plurality of variations in the actual strength of the concrete of the existing foundation. (b) The variation is a coefficient of variation calculated from the average value and the standard deviation of a plurality of actual strengths of the concrete of the existing foundation used for the new building, according to the design support method described in (a) above.

[0067] (c) A design support program for designing a new building using an existing foundation, which causes a computer to acquire the actual strength obtained from an investigation of the concrete used for the existing foundation and the design reference strength of the concrete of the existing foundation, acquire a determination curve for determining the setting method adopted corresponding to the acquired design reference strength, specify the setting method based on the comparison result between the representative value of the actual strength and the determination curve, and function as means for setting and outputting the material strength of the existing foundation for designing the new building based on the setting method.

Explanation of symbols

[0068] Fc…Design reference strength, L1, L15, L18, L21…Switching line as a determination curve, P1…Position, H10…Information processing device, H11…Communication device, H12…Input device, H13…Display device, H14…Memory device, H15…Processor, Xi…Actual strength, Xmean…Average value as a representative value of the actual strength, 10…Designer terminal, 20…Design support server, 21…Control unit, 22…Setting method storage unit, 23…Determination graph storage unit, 24…Investigation information storage unit, 210…Determination graph creation unit, 211…Actual strength acquisition unit, 212…Setting method identification unit, 213…Design processing unit, 221…First setting method, 222…Second setting method, 230…Determination graph data, 240…Investigation management data.

Claims

1. A design support method for designing a new building using an existing foundation, comprising: obtaining the actual strength obtained from an investigation of the concrete used in the existing foundation and the design standard strength of the concrete of the existing foundation; obtaining a determination curve, which is a curve for determining a setting method with the index indicating the variation of the actual strength as the x-axis and the representative value of the actual strength as the y-axis, corresponding to the obtained design standard strength; identifying a setting method from the representative value of the actual strength calculated from the obtained actual strength and the index indicating the variation of the actual strength using the obtained determination curve; characterized in that, based on the setting method, the material strength of the existing foundation for designing the new building is set and output.

2. The design support method according to claim 1, wherein in identifying the setting method, either a first setting method of setting the material strength using the actual strength obtained from the investigation in the seismic calculation or a second setting method of setting the material strength using the ratio of the adjusted strength to the design standard strength based on probability theory and the actual strength obtained from the investigation is identified.

3. A design support system for designing a new building using an existing foundation, including a computer, comprising: the computer: obtains the actual strength obtained from an investigation of the concrete used in the existing foundation and the design standard strength of the concrete of the existing foundation; obtains a determination curve, which is a curve for determining a setting method with the index indicating the variation of the actual strength as the x-axis and the representative value of the actual strength as the y-axis, corresponding to the obtained design standard strength; identifies a setting method from the representative value of the actual strength calculated from the obtained actual strength and the index indicating the variation of the actual strength using the obtained determination curve; characterized in that, based on the setting method, the material strength of the existing foundation for designing the new building is set and output.

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