Floor design method and design support device

Abstract

To provide a method for designing a floor that can evaluate vibration performance of the floor at the time of designing, and a design support device.SOLUTION: A method for designing a floor having floor panels and a floor framing estimates a feature quantity of vibrations in a floor of a floor model when external force is input to the floor model in which a virtual floor is defined. The method further specifies a first correspondence relation between an index value related to vibrations of a floor framing of an actual floor and an evaluation value based upon sensations of a human to vibrations of the actual floor when the external force is applied to the actual floor. Then the method specifies second correspondence relation between the feature quantity and the evaluation value based upon an estimation result of the feature quantity and the first correspondence relation.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a floor design method and a design support device, and more particularly to a floor design method having floor panels and a group of beams that support the floor panels, and a design support device used for designing the floor. [Background technology]

[0002] Methods for ensuring the vibration performance of building floors have been developed for some time. For example, methods for setting structural limits on the deflection of beams that make up the floor structure, or methods for controlling the vibration characteristics of the floor according to the frequency estimated from the amount of deflection, are known.

[0003] The above method uses empirical values ​​based on past floor specifications, but if the building construction plan changes and the floor specifications differ from the past specifications, the empirical values ​​may not be applicable. In this case, there is a risk that the deflection limit value cannot be accurately set or that the vibration characteristics cannot be appropriately controlled.

[0004] Meanwhile, in order to ensure the performance of a floor against vibration, the vibration performance of the floor may be evaluated. Until now, each company, such as a construction company or a housing manufacturer, has independently developed its own evaluation method for floor performance. Each company's evaluation method, for example, involves making a prototype floor in advance and using the prototype to check whether there are any problems with the design of the floor (i.e., the prototype floor) (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-219323 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when evaluating vibration performance using a prototype, the vibration performance of the floor cannot be evaluated until the floor is actually constructed. Therefore, there is a need to develop a method for evaluating vibration performance at the design stage. If such a method were available, it would be possible to ensure the desired vibration performance at the time of floor design.

[0007] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a floor design method and design support device that are capable of evaluating the vibration performance of a floor at the time of design. [Means for solving the problem]

[0008] The above-mentioned problem is solved by the floor design method of the present invention, which is a method for designing a floor having a floor panel and a group of beams supporting the floor panel, comprising the steps of: estimating a feature quantity of vibration in the group of beams of the floor model when an external force is input to the floor model that defines a virtual floor; specifying a first correspondence relationship between an index value related to vibration in the group of beams of the actual floor when an external force is input to the actual floor and an evaluation value based on human sensitivity to vibration on the actual floor; and specifying a second correspondence relationship between the feature quantity and the evaluation value based on the feature quantity estimation result and the first correspondence relationship.

[0009] According to the above method, it is possible to predict an evaluation value based on human sensitivity to floor vibrations from the design values ​​of the beams that support the floor panels, making it possible to evaluate the vibration performance of a floor at the time of its design.

[0010] Furthermore, it is preferable that the floor design method of the present invention further includes a step of specifying a third correspondence relationship between the deflection amount and the evaluation value based on the relationship between the feature amount and the deflection amount of the beam when vibration occurs in the beam included in the beam group and the second correspondence relationship, and a step of deriving the specified deflection amount, which is the deflection amount corresponding to the set evaluation value, based on the third correspondence relationship. According to the above method, it is possible to appropriately design the floors of a building based on the deflection amount corresponding to the set evaluation value (that is, the specific deflection amount).

[0011] In the floor design method of the present invention, the group of beams may include a plurality of beams arranged side by side with a gap between them. In this case, in the step of estimating the feature quantity, it is preferable to estimate the feature quantity of vibration in the group of beams for each of a plurality of floor models with different spacing sizes. In the step of specifying the second correspondence relationship, it is preferable to specify the second correspondence relationship for each spacing size. In the step of deriving the specific deflection amount, it is preferable to derive the specific deflection amount based on the second correspondence relationship corresponding to the selected spacing size. According to the above method, the specific deflection amount is derived for each size of the spacing between beams, so that the specific deflection amount appropriate for the floor structure (specifically, the beam assembly specifications) can be calculated, and the floor can be appropriately designed based on that specific deflection amount.

[0012] In the floor design method of the present invention, in the step of estimating vibration feature quantities in the group of beams of the floor model, a floor model corresponding to each use of the building having the floor may be constructed for each use, and the vibration feature quantities in the group of beams of the floor model may be estimated for each use using the floor model for each use. In this case, in the step of specifying the second correspondence relationship, the second correspondence relationship may be specified for each use. In addition, in the step of deriving the specific deflection amount, a setting value of the evaluation value may be determined according to the selected use, and the specific deflection amount may be derived based on the setting value and a third correspondence relationship corresponding to the selected use. According to the above method, the specific deflection amount is derived for each use of the building, so that the specific deflection amount according to the use of the building to be constructed can be found and the floor can be appropriately designed based on that specific deflection amount.

[0013] Furthermore, in the floor design method of the present invention, in the step of identifying the third correspondence relationship, an equation expressing the relationship between the vibration characteristic of the beams included in the beam group and the deflection amount of the beams may be used as the relationship between the vibration frequency and deflection amount in the primary mode of the beams. According to the above method, it is possible to appropriately identify the relationship between the feature amount of vibration occurring in a beam included in a beam group and the amount of deflection of the beam.

[0014] Furthermore, the above-mentioned problem is solved by the design support device of the present invention by having an estimation unit that estimates feature quantities of vibrations in a group of beams of a floor model when an external force is input to the floor model that defines a virtual floor, a first memory unit that stores a first correspondence relationship between an index value related to vibrations in a group of beams of the actual floor when an external force is input to the actual floor and an evaluation value based on human sensitivity to vibrations on the actual floor, and a second memory unit that stores a second correspondence relationship between the feature quantities and the evaluation value identified based on the estimation results of the feature quantities and the first correspondence relationship. By using the above design support device, it is possible to evaluate the vibration performance of a floor at the time of designing the floor. [Effects of the Invention]

[0015] The present invention provides a floor design method and design support device that are capable of evaluating the vibration performance of a floor at the time of designing the floor. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram showing a floor design procedure according to one embodiment of the present invention. [Figure 2] 1 is a diagram illustrating a hardware configuration of a design support apparatus according to an embodiment of the present invention. [Figure 3] FIG. 1 is a diagram illustrating functions of a design support apparatus according to an embodiment of the present invention. [Figure 4] FIG. 1 is a diagram showing the flow of the first phase of a floor design procedure according to one embodiment of the present invention. [Figure 5] FIG. 1 illustrates a floor model used in one embodiment of the present invention. [Figure 6] FIG. 2 is a diagram illustrating an example of a first correspondence relationship. [Figure 7] FIG. 10 is a diagram illustrating an example of a second correspondence relationship. [Figure 8] FIG. 1 is a diagram showing the flow of the second phase of the floor design procedure according to one embodiment of the present invention. [Figure 9] FIG. 10 is a diagram illustrating an example of a third correspondence relationship. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, one embodiment of the present invention (hereinafter referred to as the present embodiment) will be described with reference to the accompanying drawings. The concept of "device" described in this specification includes a single device that performs a specific function, as well as multiple devices that are distributed and exist independently but work together (in cooperation) to perform a specific function.

[0018] <<Floor design method according to this embodiment>> First, an outline of the floor design method according to this embodiment (hereinafter referred to as the floor design method) will be described. The floor design method is a method for designing floors to be installed in a building. The building may be a house, a rental property, an office, a store, a facility, a building, or any other building for various purposes. The building structure (skeleton) may be made of wood, steel, or reinforced concrete (RC).

[0019] The floor is composed of floor panels and a beam structure. The material of the floor panels is not particularly limited, but examples of materials that can be used include autoclaved lightweight aerated concrete (ALC) and precast concrete (PCa). The beam structure is a group of beams that support the floor panels, and is composed of multiple beams (more specifically, girders) arranged at intervals in the longitudinal and inter-beam directions. In the following, the distance between girders in the longitudinal direction is also referred to as the "span," and the distance between girders in the inter-beam direction is also referred to as the "pitch." The pitch corresponds to the width (burden width) that one girder bears when supporting a floor panel.

[0020] The floor design method evaluates the vibration performance of the floor and designs the floor based on the evaluation results. Vibration performance refers to the performance related to vibrations that occur inside a building, and specifically, it is habitability performance evaluated in accordance with the "Guidelines for Evaluating Habitability Performance Related to Vibration in Buildings" formulated by the Architectural Institute of Japan.

[0021] Conventionally, a known method for ensuring desired vibration performance involves, for example, setting a structural limit value for the deflection of beams that constitute a floor frame. However, in typical buildings such as residential buildings, the foot load (excitation force) generated when walking on the floor may be large relative to the floor weight. Furthermore, in typical buildings, floor panels may be simply attached to beams, resulting in a low level of fixation of the floor panels to the floor frame. In such cases, the floor frame and floor panels do not vibrate together but rather vibrate separately, resulting in the floor vibration performance not corresponding to the deflection of the beams. As a result, even if a limit value for deflection is set, there is a risk that the vibration performance corresponding to that limit value cannot be accurately evaluated.

[0022] On the other hand, for the reasons mentioned above, construction companies and housing manufacturers have developed their own evaluation methods up until now, but these involve fabricating prototype floors and evaluating the floor specifications through the prototypes. However, with these evaluation methods, vibration performance is evaluated using prototypes (i.e., actual floors), meaning that evaluation cannot be performed until the floors are actually fabricated.

[0023] In contrast, in this embodiment, the vibration performance of a floor can be evaluated at the design stage. In other words, the floor design method of this embodiment makes it possible to design a floor so that the desired vibration performance is ensured.

[0024] The floor design method of this embodiment is composed of two phases, as shown in Figure 1. In the first phase (hereinafter referred to as the first phase S001), vibrations of a modeled floor are simulated to estimate vibration feature quantities (physical feature quantities), and a correspondence relationship between the feature quantities and an evaluation value (psychological measure) based on human sensitivity to vibration is identified. In the second phase (hereinafter referred to as the second phase S002), a floor design value (specifically, a specific deflection amount, described below) that will yield a desired evaluation value is derived based on the correspondence relationship identified in the first phase S001.

[0025] In this embodiment, it is assumed that the floor to be evaluated is a floor with long-span beams. This is because using a floor with long-span beams reduces the effect of floor panels on floor vibration and allows for accurate evaluation of vibration performance based on the vibration behavior of the main girders included in the floor structure. Here, a floor with long-span beams is a floor in which the span (spacing) size in the floor structure is set to a predetermined value or more. The span size of a floor with long-span beams is preferably 6P or more, and more preferably 8P or more. Note that P is the unit of length used to set the pitch and span, and 1P is equivalent to approximately 910 mm (3 shaku in the shaku-kanho system).

[0026] In addition, in a floor with long span beams, the vibrations in the floor structure (strictly speaking, the vibrations that occur in the girders that make up the floor structure) are dominant, so the vibrations in the floor structure can be considered the same as the vibrations in the floor. Therefore, in the following, the vibrations in the floor structure of a floor with long span beams, i.e., the vibrations that occur in the girders, will also be simply referred to as "floor vibrations."

[0027] <<About the design support device according to this embodiment>> Next, a design support device (hereinafter referred to as design support device 10) used when designing a floor of a building in this embodiment will be described with reference to FIGS. The design support device 10 is configured by a computer, specifically a computer for a client terminal, a server computer, or a combination of a client terminal and a server computer. As shown in FIG. 2, the design support device 10 has a processor 11, a memory 12, a storage 13, an input device 14, and an output device 15.

[0028] The processor 11 is composed of, for example, a CPU (Central Processing Unit), an MPU (Micro-Processing Unit), an MCU (Micro Controller Unit), a GPU (Graphics Processing Unit), a DSP (Digital Signal Processor), a TPU (Tensor Processing Unit), or an ASIC (Application Specific Integrated Circuit). The memory 12 is configured by semiconductor memories such as a ROM (Read Only Memory) and a RAM (Random Access Memory).

[0029] The storage 13 is configured by, for example, a flash memory, an HDD (Hard Disc Drive), an SSD (Solid State Drive), an FD (Flexible Disc), an MO disk (Magneto-Optical disc), a CD (Compact Disc), a DVD (Digital Versatile Disc), an SD card (Secure Digital card), or a USB memory (Universal Serial Bus memory), etc. The storage 13 may be built into the computer main body that configures the design support device 10, or may be attached to the computer main body in an external format, or may be configured by an external server (for example, a database server) present on a network. The input device 14 is configured by, for example, a keyboard, a mouse, or a touch panel. The output device 15 is configured by, for example, a display and a speaker.

[0030] Furthermore, the computer constituting the design support device 10 has installed therein, as software, a program for an operating system (OS) and an application program for floor design.

[0031] 3, the design support device 10 includes an estimation unit 21, a first identification unit 22, a first storage unit 23, a second identification unit 24, a second storage unit 25, a third identification unit 26, a third storage unit 27, and a derivation unit 28. These functional units are realized by cooperation between hardware devices included in a computer constituting the design support device 10 and a program as software installed on the computer. Each of the functional units included in the design support device 10 will be described in a later section.

[0032] <<Floor design flow>> Next, a procedure for designing a floor of a building using the floor design method of this embodiment (hereinafter referred to as a floor design flow) will be described. Each process in the floor design flow, specifically each step shown in Figures 4 and 8, is mainly performed by the design support device 10. Note that in the floor design flow, a user (person) of the design support device 10 may assist the design support device 10; for example, when the design support device 10 acquires information necessary for floor design, the user may input the information via the input device 14. The floor design flow may also include a process performed by the user instead of the design support device 10; for example, the user may obtain test data, etc., necessary for identifying the first correspondence relationship described below.

[0033] As mentioned above, the floor design flow is divided into a first phase S001 and a second phase S002. Below, the flow of each phase will be explained.

[0034] [About Phase 1] The first phase S001 proceeds according to the flow shown in Fig. 4. In the first phase S001, first, a floor model that defines a virtual floor is constructed, and a vibration feature amount in the floor assembly of the floor model when an external force is input to the floor model is estimated (S011). This step S011 is performed by a function of the design support device 10, more specifically, by the estimation unit 21.

[0035] A floor model is a structural model constructed to analyze vibrations that occur in the floor of the design target, and is, for example, a wire model in which each of the multiple beams included in the floor framing (beam group) of the floor is modeled as a wire, as shown in Figure 5. To construct a floor model, the number of beams that make up the beam framing, the size of the spacing between the beams (span and pitch), values ​​related to the cross-section such as the cross-sectional shape and section modulus of the beams, as well as the material and thickness of the floor panels are required, and these values ​​are input by, for example, the user. Furthermore, in the floor model, the floor panels, which are elements other than the structure (floor framing), are considered as a load (weight) acting on the floor framing.

[0036] In the floor model, for example, the span between beams is set within the range of 8P to 11P, and the pitch between beams is set within the range of 3P to 6P. In other words, the floor model is set as a floor with long-span beams. As a result, the vibration of the floor model is dominated by the vibration of the floor structure, or more precisely, the deflection behavior of the girders included in the floor structure, and the influence of the vibration of the floor panel itself can be minimized. As a result, vibration analysis using the floor model can be premised on analytical calculations of the structure only, and highly reliable analysis results can be obtained.

[0037] In step S011, the design support device 10 (more specifically, the estimation unit 21) estimates the feature quantities of vibrations that occur when a walking load is input to the floor model as an excitation force. More specifically, the feature quantities are estimated when a predetermined walking load is input to a girder that is located at the center of the beam-to-beam direction among the multiple beams that make up the floor structure. The vibration feature quantities are physical feature quantities related to the vibration of the floor model, more specifically, the vibration of the floor structure included in the floor model. In other words, the vibration feature quantities are feature quantities related to the deflection (deformation) of the girder included in the floor structure, and specifically, the vibration feature quantities include the frequency and acceleration of the girder that is deflectively vibrating.

[0038] A known analysis method and analysis program can be used to estimate the feature values ​​(i.e., vibration analysis), one example of which is "SNAP" by Structural Software Co., Ltd. However, it goes without saying that analysis programs other than those mentioned above may also be used for vibration analysis. The feature amount may be calculated (estimated) by static calculation or dynamic calculation.

[0039] Furthermore, step S011 is repeatedly performed for each interval (pitch or span) between beams in the floor model, changing the interval size. This allows estimation of the feature amount of vibration in the floor structure for each of a plurality of floor models with different interval sizes. Furthermore, step S011 may be performed for each use of the building. Specifically, floor specifications (for example, settings for the floor assembly, thickness and material of the floor panel, etc.) may be changed depending on the use, a floor model may be constructed for each use, and the floor model for each use may be used to estimate the feature quantity of vibration in the floor assembly for each use.

[0040] In the first phase S001, as shown in Fig. 4, a first correspondence relationship between the index value of floor vibration and the evaluation value is identified based on the results of a vibration test performed using an actual building floor (S012). This step S012 is performed by a function of the design support device 10, specifically, by the first identification unit 22. In the flow shown in FIG. 4, step S012 is to be performed after step S011, but this is not limited to this, and step S012 may be performed before step S011 or at the same time as step S011.

[0041] To explain about vibration testing, in vibration testing, a person walks on the floor of an actual building (hereinafter referred to as the actual floor), that is, the vibration (walking vibration) is measured when a walking load is input as an excitation force to the actual floor. In addition, in vibration testing, an inspector is placed on the actual floor and an evaluation based on the inspector's sensitivity to walking vibration is performed, more specifically a sensory test. The floor used in the vibration test (test floor) is a long-span floor, with a span size of 8P or more.

[0042] When measuring walking vibrations, accelerometers or displacement meters are attached to the underside of an actual floor at locations designated as receiving points, and these instruments are used to measure the acceleration or displacement during walking vibrations at each receiving point at regular time intervals.

[0043] In a sensory test for walking vibration, the magnitude, level, or scale of walking vibration is quantified based on the inspector's sensitivity. The magnitude of walking vibration is evaluated on n levels (n is a natural number equal to or greater than 2) using a psychological scale (hereinafter referred to as the perceived magnitude scale) that indicates whether the inspector notices walking vibration or how loud it feels. The perceived magnitude scale is set to eight levels, for example, from 0 to 7, and the higher the number, the greater the degree of recognition (i.e., the greater the vibration is perceived). The evaluation result of the sensory test, i.e., the magnitude of walking vibration evaluated on the perceived magnitude scale, becomes the evaluation value for the vibration. As a psychological scale for walking vibration, a scale indicating how much walking vibration bothers the inspector (annoyance level evaluation scale) may be used.

[0044] Vibration tests are conducted multiple times, changing the floor to be tested. In each vibration test, at least one of the following conditions is changed: the size of the spacing between beams in the floor structure (span and pitch), the cross-sectional shape and section modulus of the beams, the type and spacing of sub-beams or panel supports, and the mass and rigidity of the floor panels. This allows measurement values ​​of walking vibration and evaluation values ​​from sensory tests to be obtained for floors created under various conditions.

[0045] Regarding the method for measuring walking vibrations in vibration tests and the method for conducting sensory tests, the method described in "Yokoyama Yutaka, Kuroda Eiichi, Fukuda Shintaro, 'Basic study on performance values ​​applicable to highly rigid floors - Evaluation method for walking vibrations of wooden large span floors from the viewpoint of livability (Part 2)'," Transactions of the Architectural Institute of Japan, June 2015, Vol. 80, No. 712, pp. 509-518 (hereinafter abbreviated as "Non-Patent Document 1") may be used.

[0046] After obtaining measured values ​​of walking vibration in a vibration test, an index value related to walking vibration (i.e., an index value of vibration in the actual floor assembly) is calculated from the measured values. Specifically, the performance value described in Non-Patent Document 1 is calculated from the time change in acceleration of the measured walking vibration. More specifically, time constant processing is performed on the time change in acceleration (i.e., the acceleration-time curve), and the performance value is calculated from the level-converted waveform. The converted levels include the following two levels, wVAL and VL (unit: dB). wVAL: Corrected vibration acceleration level (unit: dB) calculated using the correction formula described on page 513 of Non-Patent Document 1 VL: Vibration level VL (unit: dB) obtained by separating the acceleration-time curve into 1 / 3 octave bands and then performing time constant processing to synthesize the levels of each band.

[0047] The performance value may be any one of the following four values ​​V1 to V4, or a combination of two or more values, for the waveform at each level. Each of the performance values ​​V1 to V4 can be calculated according to the procedure described in Non-Patent Document 1. Performance value V1: Maximum value of waveform at each level Performance value V2: Sum of the maximum values ​​for each step in the waveform of each level Performance value V3: The integral value of the part of the waveform at each level that exceeds the reference value Performance value V4: The maximum value of the waveform for each level plus a value corresponding to the time (duration) during which the acceleration remains above the reference value

[0048] After determining the vibration performance value for each of the multiple vibration tests in the above manner, the performance value obtained in each vibration test and the evaluation value (results of the sensory test) are plotted in two-dimensional coordinate space. By repeating this process for each vibration test, the relationship between the performance value and the evaluation value can be visualized in a relationship diagram, as shown in Figure 6. The value on the horizontal axis of the relationship diagram represents the performance value (performance value V2 in Figure 6), and the value on the vertical axis represents the perceived magnitude scale that indicates the evaluation value.

[0049] Then, an approximation formula that approximates the relationship between the performance value and the evaluation value is calculated from the coordinate values ​​of the plots in the relationship diagram. By calculating an approximation formula that approximates the relationship between the performance value and the evaluation value in this manner, the correspondence relationship between the performance value and the evaluation value, i.e., a first correspondence relationship, is identified. The identified first correspondence relationship is stored in the memory 12 or storage 13 of the design support device 10, and more specifically, is stored in the first storage unit 23. The correspondence relationship between the performance value and the evaluation value may be approximated by a curve as shown in FIG. 6 or by a straight line, and the approximation formula may be found by a known method.

[0050] As described above, by quantifying the evaluation results based on human sensitivity to walking vibration, it is possible to quantitatively grasp the correspondence between the physical characteristics of walking vibration and the psychological scale (i.e., the first correspondence between the performance value and the evaluation value). Then, in this embodiment, by reflecting the quantified correspondence in the floor design, it is possible to determine the floor specifications so that the evaluation value is kept below a target value. Details of this will be explained later.

[0051] Returning to the explanation of the first phase S001, after the first correspondence relationship is identified, a second correspondence relationship, which is a correspondence relationship between the feature amount and the evaluation value, is identified (S013) based on the feature amount estimation result in step S011 and the first correspondence relationship identified in step S012. This step S13 is performed by a function of the design support device 10, specifically, by the second identification unit 24.

[0052] In step S013, the vibration feature (e.g., time change in response acceleration) estimated by the analysis using the floor model is converted into the above-mentioned performance value, and the converted performance value is substituted into the above-mentioned approximation formula. This allows an evaluation value for the vibration that is the estimated feature to be calculated. This evaluation value calculation process is performed for each of the feature estimated in step S011.

[0053] In the above manner, an evaluation value of vibration is obtained for each of the feature quantities estimated in step S011. Then, a combination of the feature quantity and the evaluation value is plotted for each feature quantity in a two-dimensional coordinate space. This makes it possible to visualize the relationship between the feature quantity and the evaluation value as a relationship diagram, as shown in FIG. 7. Here, the values ​​on the horizontal axis of the relationship diagram represent the feature quantity, and the values ​​on the vertical axis represent the evaluation value (specifically, the perceived magnitude scale). Note that FIG. 7 is a relationship diagram assuming a floor in a house that uses ALC boards as floor panels.

[0054] 7, the vibration frequency is used as the feature amount, but since the vibration frequency and acceleration can be converted into each other, for example, an evaluation value may be calculated from the acceleration, and a relationship diagram showing the relationship between the calculated evaluation value and the vibration frequency converted from the acceleration may be obtained. Conversely, an evaluation value may be calculated from the vibration frequency, and a relationship diagram showing the relationship between the calculated evaluation value and the acceleration converted from the vibration frequency may be obtained.

[0055] Then, an approximation formula that approximates the relationship between the feature quantities and the evaluation values ​​is calculated from the coordinate values ​​of the plots in the relationship diagram. By calculating an approximation formula that approximates the relationship between the feature quantities and the evaluation values ​​in this manner, a correspondence relationship between the feature quantities and the evaluation values, i.e., a second correspondence relationship, is identified. The identified second correspondence relationship is stored in the memory 12 or the storage 13 of the design support device 10, and more specifically, in the second storage unit 25. The correspondence relationship between the feature quantities and the evaluation values ​​may be approximated by a straight line as shown in FIG. 7 or a curve, and the approximation formula may be obtained by a known method.

[0056] By identifying the second correspondence relationship, it is possible to derive the vibration feature quantity that will yield a certain evaluation value. This makes it possible to derive the vibration frequency of the floor framing (more specifically, the girder) that will keep the evaluation value below the target set value (tolerance value). For example, assuming a case where the second correspondence relationship shown in Figure 7 has been obtained, and the pitch is set to 4.5P and the tolerance is set to the value represented by the thick line parallel to the horizontal axis in Figure 7, in order to keep the evaluation value below the tolerance value, the floor framing should be designed so that the vibration frequency of the girder is 10Hz or higher.

[0057] Furthermore, the second correspondence relationship stored in the second storage unit 25, specifically, the approximation formula that approximates the relationship between the feature quantity and the evaluation value, may be visualized and displayed on a display that is the output device 15 of the design support device 10, or a coordinate diagram including the curve indicated by the approximation formula may be printed by a printer. This allows the user of the design support device 10, who is the floor designer, to understand the second correspondence relationship, that is, the correspondence relationship between the feature quantity and the evaluation value, by looking at the display or printed matter, and to design the floor taking this into consideration.

[0058] In step S011, the size of the interval (pitch and span) between the beams is changed to estimate the vibration feature amount for each interval size, and therefore, in step S013, the vibration evaluation value is obtained for each interval size, thereby specifying an approximate expression showing the second correspondence relationship for each interval size, as shown in Fig. 7. Figure 7 shows the second correspondence relationship, i.e., the approximate straight line, when the pitch is changed to 3P, 4P, and 5P. As can be seen from Figure 7, the larger the pitch, the smaller the evaluation value for vibration, even for the same vibration frequency. This is because, as the pitch increases, the load on the floor panels borne by each girders that make up the floor structure increases, and the walking load, which is the exciting force, becomes relatively smaller.

[0059] In step S011, a floor model is constructed according to the floor specifications corresponding to the building use, and vibration feature quantities can be estimated for each use. In this case, in step S013, a vibration evaluation value can be obtained for each use, and as a result, the second correspondence relationship (more specifically, an approximation formula indicating the second correspondence relationship) can be identified for each building use.

[0060] When step S013 is completed, the first phase S001 is completed. After the first phase S001 is completed, the second phase S002 is initiated. The second phase S002 proceeds according to the flow shown in FIG.

[0061] In the second phase S002, first, a third correspondence relationship is identified (S021), which is a correspondence relationship between the deflection of a girder included in the floor framing when vibration occurs in the girder and an evaluation value for the vibration in the floor framing. This step S021 is performed by a function of the design support device 10, more specifically, by the third identification unit 26.

[0062] In step S021, a third correspondence relationship is identified based on the correspondence relationship between the feature amount of vibration occurring in the girder and the deflection amount of the girder, and the second correspondence relationship identified in step S013. The correspondence relationship between the feature amount of vibration and the deflection amount of the girder is the correspondence relationship between the frequency of the girder in the first mode (hereinafter referred to as the natural frequency) and the deflection amount of the girder, and is expressed by a known relational expression. An example of a known relational expression is the gravity equation, which estimates the natural period of a building. The gravity equation is an equation derived from the physical law that states that the natural frequency of a structure is determined by the vibrating weight (point mass) and the rigidity that controls the movement of that weight, and by expanding the gravity equation, the relationship between the natural frequency and the deflection amount (strictly speaking, an approximate equation) can be derived.

[0063] Then, by combining the correspondence relationship between the natural frequency of the girder and the deflection amount with the second correspondence relationship, which is the correspondence relationship between the frequency and the evaluation value, it is possible to obtain the correspondence relationship between the deflection amount and the evaluation value shown in Fig. 9, i.e., a curve showing the third correspondence relationship (hereinafter referred to as the evaluation curve). The values ​​on the horizontal axis of Fig. 9 represent the evaluation value (certified size scale), and the values ​​on the vertical axis represent the deflection amount. FIG. 9 shows an evaluation curve for a residential floor in which ALC boards are used as floor panels.

[0064] The third correspondence relationship identified in the above manner, specifically, the equation representing the evaluation curve, is stored in the memory 12 or the storage 13 of the design support device 10, and more specifically, in the third storage unit 27.

[0065] Furthermore, in step S013 of the first phase S001, the second correspondence relationship is identified for each size of the gap between beams in the floor structure, and accordingly, in step S021, an evaluation curve can be obtained for each size of gap. FIG. 9 shows evaluation curves when the pitch size is changed in increments of 0.5P from 3P to 6P. In addition, in step S013, the second correspondence relationship can be identified for each use of the building. In this case, in step S021, an evaluation curve can be obtained for each use.

[0066] Returning to the explanation of the second phase S002, after the third correspondence relationship is identified, the specific deflection amount is derived based on the third correspondence relationship (S022). This step is performed by the function of the design support device 10, more specifically, by the derivation unit 28.

[0067] The specific deflection amount is the deflection amount corresponding to the set evaluation value, i.e., the set value set as the allowable value of the evaluation value.In simple terms, the specific deflection amount is the upper limit of the deflection amount that can keep the evaluation value below the allowable value.

[0068] The procedure for deriving the specific deflection will be explained with reference to Figure 9. In the two-dimensional coordinate space in which the assessment curve is drawn, the intersection of the assessment curve and a vertical line (thick line parallel to the vertical axis in Figure 9) that passes through the above-mentioned allowable value is found. At this time, if an assessment curve exists for each size of gap between beams, the assessment curve that corresponds to the gap size that matches the specifications of the floor to be designed is selected, and the above-mentioned intersection is found for the selected assessment curve.

[0069] The specific deflection amount is then derived from the coordinates of the intersection point thus determined. By setting this specific deflection amount as the limit value for the deflection of the girder and determining the floor specifications so that the limit value is not exceeded, the evaluation value can be kept below the allowable value. As a result, the desired vibration performance (habitability performance) of the floor to be designed is ensured, and this can be confirmed at the design stage. In other words, according to the floor design method of this embodiment, the vibration performance of the floor to be designed can be evaluated at the design stage without the need to fabricate a prototype floor. The specific deflection amount corresponds to the frequency of the girder that makes the evaluation value equal to or less than the allowable value, that is, the frequency of the girder that is derived based on the allowable value and the second correspondence relationship.

[0070] The specific deflection amount derived in the above manner may be visualized and displayed on a display, which is the output device 15 of the design support device 10. This allows the user of the design support device 10, who is the floor designer, to check the displayed specific deflection amount and design the floor taking the specific deflection amount into consideration. Note that instead of or in addition to displaying the specific deflection amount, the above-mentioned evaluation curve may be displayed on the display, or a coordinate diagram including the evaluation curve may be printed by a printer.

[0071] Furthermore, when an assessment curve is obtained for each building use, the use of the building to which the floor to be designed is selected, and the above-mentioned allowable values ​​are set according to the selected use. Then, the specific deflection amount is derived in the above-mentioned manner based on the assessment curve corresponding to the selected use and the allowable values ​​according to the selected use. This makes it possible to derive the specific deflection amount according to the use, and as a result, it is possible to design a floor that ensures the desired vibration performance, taking into account the use of the building.

[0072] As described above, in this embodiment, in the first phase S001, various conditions such as the building use, specifically the floor specifications according to the use, are changed to estimate the vibration feature quantities of the floor assembly, and an evaluation value corresponding to the estimated feature quantities can be obtained. Furthermore, in the second phase S002, the specific deflection quantity for each condition can be derived. This makes it easy to perform an analysis (parametric study) of the floor design specifications.

[0073] <<Other embodiments>> Although one embodiment of the floor design method and design support device of the present invention has been described above, the above embodiment is merely an example for facilitating understanding of the present invention and does not limit the present invention. In other words, the present invention can be modified and improved without departing from the spirit of the present invention. Furthermore, it goes without saying that the present invention includes equivalents thereof.

[0074] Furthermore, in the above embodiment, after the correspondence relationship (second correspondence relationship) between the vibration feature amount in the floor assembly and the evaluation value for the vibration is identified in the first phase S001, the specific deflection amount for the set evaluation value is derived based on the second correspondence relationship in the second phase S002. However, this is not limited to this, and the second phase S002 does not necessarily have to be performed. In other words, instead of deriving the specific deflection amount, the second correspondence relationship identified in the first phase S001 may be presented to the floor designer. In this case, too, the floor designer can design a floor that achieves the desired vibration performance by taking into account the presented second correspondence relationship.

[0075] In the above embodiment, when specifying the correspondence relationship between the performance values ​​obtained in the vibration test and the evaluation values ​​obtained in the sensory test, i.e., the first correspondence relationship, an approximation formula that approximates the relationship between the two is obtained. Similarly, when specifying the correspondence relationship between the vibration feature values ​​and the evaluation values ​​(second correspondence relationship), an approximation formula that approximates the relationship between the two is obtained. However, this is not limited to this, and for example, a corresponding evaluation value may be obtained for each of a plurality of performance values, and the correspondence relationships between the performance values ​​and the evaluation values ​​may be stored in a table. Similarly, a corresponding evaluation value may be obtained for each of a plurality of feature values, and the correspondence relationships between the feature values ​​and the evaluation values ​​may be stored in a table.

[0076] In the above embodiment, the feature quantity of vibration occurring when a walking load is input to the floor model is estimated as the feature quantity of vibration in the floor assembly of the floor model. Furthermore, the first correspondence relationship is specified as the first correspondence relationship between the index value and the evaluation value for vibration occurring when a walking load is input to an actual floor. However, when estimating the feature quantity of vibration or specifying the first correspondence relationship, the input excitation force is not limited to the walking load, and may be other loads (for example, external vibrations). [Explanation of symbols]

[0077] 10 Design support equipment 11 processors 12 Memory 13. Storage 14 Input Devices 15 Output Devices 21 Estimation part 22 First Specific Part 23 1st memory section 24 Second Specific Part 25 2nd memory section 26 Third Specific Part 27 Third memory section 28 Derivation part

Claims

1. A method for designing a floor having floor panels and a group of beams supporting the floor panels, comprising: a step of estimating, by a computer, a feature quantity of vibration in the group of beams of the floor model when an external force is input to the floor model that defines the virtual floor; a step of specifying a first correspondence relationship between an index value related to vibration of the group of beams of the actual floor when an external force is input to the actual floor and an evaluation value based on human sensitivity to vibration of the actual floor; a step of specifying a second correspondence relationship between the feature amount and the evaluation value based on the feature amount estimation result and the first correspondence relationship by the computer; a step of specifying a third correspondence relationship between the deflection amount and the evaluation value based on the relationship between the feature amount and the deflection amount of the beam when vibration occurs in the beam included in the beam group and the second correspondence relationship; and a step of deriving, by the computer, a specific deflection amount that is the deflection amount corresponding to the set evaluation value based on the third correspondence relationship, The beam group includes a plurality of beams arranged side by side at intervals, In the step of estimating the feature amount, the feature amount of vibration in the group of beams is estimated for each of the plurality of floor models having different interval sizes; In the step of identifying the second correspondence relationship, the second correspondence relationship is identified for each size of the interval; In the step of deriving the specific deflection amount, the specific deflection amount is derived based on the second correspondence relationship corresponding to the selected size of the interval.

2. A method for designing a floor having floor panels and a group of beams supporting the floor panels, comprising: a step of estimating, by a computer, a feature quantity of vibration in the group of beams of the floor model when an external force is input to the floor model that defines the virtual floor; a step of specifying a first correspondence relationship between an index value related to vibration of the group of beams of the actual floor when an external force is input to the actual floor and an evaluation value based on human sensitivity to vibration of the actual floor; a step of specifying a second correspondence relationship between the feature amount and the evaluation value based on the feature amount estimation result and the first correspondence relationship by the computer; a step of specifying a third correspondence relationship between the deflection amount and the evaluation value based on the relationship between the feature amount and the deflection amount of the beam when vibration occurs in the beam included in the beam group and the second correspondence relationship; and a step of deriving, by the computer, a specific deflection amount that is the deflection amount corresponding to the set evaluation value based on the third correspondence relationship, In the step of estimating the feature amount of vibration in the group of beams of the floor model, the floor model according to the purpose of use of a building having the floor is constructed for each of the purposes, and the feature amount of vibration in the group of beams of the floor model is estimated for each of the purposes using the floor model for each of the purposes; In the step of identifying the second correspondence relationship, the second correspondence relationship is identified for each of the applications; In the step of deriving the specific deflection amount, a setting value of the evaluation value is determined in accordance with the selected use, and the specific deflection amount is derived based on the setting value and the third correspondence relationship corresponding to the selected use.

3. 3. The floor design method according to claim 1, wherein in the step of identifying the third correspondence relationship, an equation expressing the relationship between the frequency in the primary mode of the beam and the deflection amount is used as the relationship between the characteristic amount of vibration occurring in the beam included in the group of beams and the deflection amount of the beam.

4. A design support device used to design a floor having floor panels and a group of beams supporting the floor panels, an estimation unit that estimates a feature amount of vibration in the group of beams of the floor model when an external force is input to the floor model that defines the virtual floor; a first storage unit that stores a first correspondence relationship between an index value related to vibration of the beam group of the actual floor when an external force is input to the actual floor and an evaluation value based on human sensitivity to vibration of the actual floor; a second storage unit configured to store a second correspondence relationship between the feature amount and the evaluation value, the second correspondence relationship being specified based on the feature amount estimation result and the first correspondence relationship; a third storage unit configured to store a relationship between the feature amount and the deflection amount of the beam when vibration occurs in the beam included in the beam group, and a third correspondence relationship between the deflection amount and the evaluation value, which is specified based on the second correspondence relationship; a derivation unit that derives a specific deflection amount, which is the deflection amount corresponding to the set evaluation value, based on the third correspondence relationship, The beam group includes a plurality of beams arranged side by side at intervals, the estimation unit estimates the feature amount of vibration in the group of beams for each of the plurality of floor models having different interval sizes; the second correspondence relationship is specified for each size of the interval; The derivation unit derives the specific deflection amount based on the second correspondence relationship corresponding to the selected size of the interval.

5. A design support device used to design a floor having floor panels and a group of beams supporting the floor panels, an estimation unit that estimates a feature amount of vibration in the group of beams of the floor model when an external force is input to the floor model that defines the virtual floor; a first storage unit that stores a first correspondence relationship between an index value related to vibration of the beam group of the actual floor when an external force is input to the actual floor and an evaluation value based on human sensitivity to vibration of the actual floor; a second storage unit configured to store a second correspondence relationship between the feature amount and the evaluation value, the second correspondence relationship being specified based on the feature amount estimation result and the first correspondence relationship; a third storage unit configured to store a relationship between the feature amount and the deflection amount of the beam when vibration occurs in the beam included in the beam group, and a third correspondence relationship between the deflection amount and the evaluation value, which is specified based on the second correspondence relationship; a derivation unit that derives a specific deflection amount, which is the deflection amount corresponding to the set evaluation value, based on the third correspondence relationship, The beam group includes a plurality of beams arranged side by side at intervals, The floor model according to the purpose of the building having the floor is constructed for each purpose, the estimation unit estimates, for each of the intended uses, the feature amount of vibration in the group of beams of the floor model; the second correspondence relationship is specified for each size of the interval; the derivation unit determines a setting value of the evaluation value in accordance with the selected application, and derives the specific deflection amount based on the setting value and the third correspondence relationship corresponding to the selected application.

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