JP7297209B2 - Swing index value calculation method, sway index value calculation device, and sway index value calculation program - Google Patents

Description

The present invention relates to a shake index value calculation method, a shake index value calculation device, and a shake index value calculation program.

Currently, when an earthquake occurs, the seismic intensity announced by a public institution is the result of measurement by a seismic intensity meter owned by the public institution. Therefore, although it is possible to grasp the seismic intensity at the position where the seismic intensity meter is installed, it does not indicate how a specific structure shook due to the earthquake. For example, Patent Literatures 1 to 3 disclose a system in which an acceleration sensor is installed on each floor of a structure to confirm how much each floor of the structure shook after an earthquake occurred. According to Patent Documents 1 to 3, it is possible to confirm how much each floor of a structure that has already been built shook after an earthquake occurred.

JP 2014-114145 A JP 2011-095237 A JP 2017-198610 A

However, even with Patent Documents 1 to 3, for example, each floor of a structure to be erected in the future or each floor of a structure that has already been built cannot provide an index indicating how much an earthquake will occur in the future. In fact, for those who live in structures, it is important to know how much each floor of the structure will shake before an earthquake occurs in order to understand the need for earthquake countermeasures to be applied to the structure. For example, if it is possible to numerically show how much each floor of a house built from these earthquakes will shake in the event of an earthquake of the same magnitude as a major earthquake that occurred in the past, what kind of earthquake countermeasures should be taken for the house? This makes it easier to understand what is going on, and makes it possible to appropriately select necessary earthquake countermeasures.

The present invention has been made in view of the above-mentioned problems, and provides numerical values indicating how much each of a plurality of positions of a structure shakes before an earthquake occurs, and appropriately selects earthquake countermeasures necessary for the structure. We aim to make it possible.

The present invention employs the following configurations as means for solving the above problems.

A first invention is a shaking index value calculation method for obtaining a shaking index value indicating the degree of shaking caused by an earthquake, comprising: an evaluation position setting step of setting a plurality of evaluation positions on a structure; and an acceleration calculation step for calculating the acceleration for each evaluation position obtained by inputting the A vibration cycle calculation step of calculating a vibration cycle and a vibration index value calculation step of obtaining a vibration index value for each evaluation position based on the acceleration and the vibration cycle are employed.

In a second invention, in the first invention, an option selection step of selecting an earthquake countermeasure option provided for the structure is provided prior to the acceleration calculation step, and the earthquake countermeasure option is selected in the acceleration calculation step. The acceleration for each evaluation position is calculated based on the structure provided with the vibration period for each evaluation position based on the structure provided with the earthquake countermeasure option in the vibration period calculation step is calculated.

A third invention employs a configuration in which, in the second invention, after the shake index value calculation step, the option selection step is returned to and the earthquake countermeasure option selected in the previous option selection step is changed.

A fourth aspect of the invention is a shaking index value calculating device for obtaining a shaking index value indicating the degree of shaking caused by an earthquake, comprising: an evaluation position setting unit for setting a plurality of evaluation positions on a structure; and an acceleration calculation unit that calculates the acceleration for each evaluation position obtained by inputting the A configuration including a vibration cycle calculation unit for calculating a vibration cycle and a vibration index value calculation unit for obtaining a vibration index value for each evaluation position based on the acceleration and the vibration cycle is adopted.

A fifth aspect of the invention is the fourth aspect, further comprising an option selection unit for selecting an earthquake countermeasure option provided for the structure, wherein the acceleration calculation unit is based on the structure provided with the earthquake countermeasure option. calculates the acceleration for each of the evaluation positions, and the vibration period calculation unit calculates the vibration period for each of the evaluation positions based on the structure provided with the earthquake countermeasure option.

In a sixth aspect based on the fifth aspect, the option selection section changes the earthquake countermeasure option selected by the option selection section, and the acceleration calculation section is provided with the changed earthquake countermeasure option. The acceleration for each evaluation position is calculated based on the structure that has been changed, and the vibration period calculation unit calculates the vibration for each evaluation position based on the structure that is provided with the changed earthquake countermeasure option. A configuration of calculating the period is adopted.

A seventh aspect of the invention is a shaking index value calculation program for causing a computer to calculate a shaking index value, the computer comprising: an evaluation position setting unit for setting a plurality of evaluation positions on a structure; and an acceleration calculation unit that calculates the acceleration for each evaluation position obtained by inputting the A configuration is employed that functions as a vibration period calculation section that calculates a vibration period and a vibration index value calculation section that obtains a vibration index value for each evaluation position based on the acceleration and the vibration period.

According to an eighth invention, in the seventh invention, the computer functions as an option selection unit that selects an earthquake countermeasure option provided for the structure, and based on the structure provided with the earthquake countermeasure option, the It functions as the acceleration calculation unit that calculates the acceleration for each evaluation position, and functions as the vibration cycle calculation unit that calculates the vibration cycle for each evaluation position based on the structure provided with the earthquake countermeasure option. configuration is adopted.

In a ninth aspect based on the eighth aspect, the computer is caused to function as the option selection unit for changing the previously selected earthquake countermeasure option, and the structure having the changed earthquake countermeasure option is provided with the function as the acceleration calculation unit for calculating the acceleration for each of the evaluation positions based on the vibration, and calculate the vibration period for each of the evaluation positions based on the structure provided with the changed earthquake countermeasure option A configuration of functioning as a period calculation unit is adopted.

According to the present invention, a shaking index value can be indicated based on acceleration and vibration period for each of a plurality of evaluation positions set on a structure before an earthquake occurs. Therefore, according to the present invention, it is possible to appropriately select earthquake countermeasures necessary for a structure for each evaluation position.

1 is a block diagram schematically showing the hardware configuration of a shake index value calculation device according to a first embodiment of the present invention; FIG. 1 is a block diagram showing the functional configuration of a shake index value calculation device according to a first embodiment of the present invention in which a shake index value calculation program is installed; FIG. 4 is a flowchart showing a process of calculating a shake index value (shake index value calculation method) using the shake index value calculation device according to the first embodiment of the present invention. FIG. 4 is a relationship diagram showing the relationship between maximum acceleration, dominant period, and seismic intensity; FIG. 4 is a schematic diagram of a model of a four-story building used in a specific example of calculation by the shaking index value calculation device according to the first embodiment of the present invention, and is a diagram showing a non-reinforced type; FIG. 4 is a schematic diagram of a model of a four-story building used in a specific calculation example by the sway index value calculation device in the first embodiment of the present invention, and is a diagram showing bracing reinforcement types. FIG. 4 is a schematic diagram of a model of a four-story building used in a specific calculation example by the sway index value calculation device according to the first embodiment of the present invention, and is a diagram showing spring and damper reinforcement types. It is a table|surface which shows the result of the calculation performed with respect to an unreinforced type. 5 is a diagram in which the maximum acceleration and dominant period at each evaluation position obtained by calculation for the unreinforced type are applied to the relationship diagram (seismic intensity scale diagram) shown in FIG. 4. FIG. Fig. 10 is a table showing the results of calculations performed for bracing reinforcement types; FIG. 5 is a diagram in which the maximum acceleration and dominant period at each evaluation position obtained by calculation for the bracing reinforcement type are applied to the relationship diagram (seismic intensity scale diagram) shown in FIG. 4 . FIG. 10 is a table showing the results of calculations performed for spring and damper reinforcement types; FIG. FIG. 5 is a diagram in which the maximum acceleration and dominant period at each evaluation position obtained by calculation for the spring and damper reinforcement type are applied to the relationship diagram (seismic intensity scale diagram) shown in FIG. 4 . 10 is a table summarizing the seismic intensity at each evaluation position obtained for the non-reinforced type, the bracing reinforced type, and the spring and damper reinforced type. 9 is a flow chart showing a process of calculating a shake index value (a shake index value calculation method) using the shake index value calculation device according to the second embodiment of the present invention.

An embodiment of a shake index value calculation method, a shake index value calculation apparatus, and a shake index value calculation program according to the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram schematically showing the hardware configuration of a shake index value calculation device 1 of this embodiment. As shown in this figure, the shake index value calculation device 1 is composed of a computer such as a personal computer or a workstation, and includes an arithmetic processing processor 2, a storage device 3, an optical drive 4, an input device 5, and an output device 6 .

The arithmetic processor 2 is composed of, for example, a CPU (Central Processing Unit), is electrically connected to a storage device 3, an optical drive 4, an input device 5, and an output device 6, and receives signals input from these various devices. is processed and the processing result is output.

The storage device 3 is composed of an internal storage device such as a memory and an external storage device such as a hard disk drive. Output the stored information. Such a storage device 3 includes a program storage section 3a and a data storage section 3b.

The program storage unit 3a stores a shake index value calculation program P. The sway index value calculation program P is an application program that is executed on a predetermined OS (Operating System), and causes the sway index value calculation device 1 of this embodiment, which is a computer, to function to calculate a sway index value. . The data storage unit 3b stores structure data D1 representing a structure for which a shaking index value is to be calculated, and simulation seismic wave data D2 representing a simulation seismic wave used for calculating the shaking index value. The data storage unit 3b also stores intermediate data generated during the process of the arithmetic processing processor 2 and arithmetic result data obtained by the arithmetic processing processor 2 .

The optical drive 4 is a device capable of loading DVD (Digital Versatile Disc) media and BD media, and outputs data stored in the DVD media and BD media based on commands input from the arithmetic processor 2 . For example, the shake index value calculation program P is stored in these DVD media and BD media, and is written to the program storage unit 3a under the processing of the arithmetic processor 2. FIG.

The input device 5 is a man-machine interface between the shake index value calculation device 1 of the present embodiment and the operator, and is composed of a keyboard and a mouse. The output device 6 is a device for visualizing and outputting signals input from the arithmetic processing processor 2, and is composed of a display and a printer.

Although not shown in FIG. 1, for example, the shake index value calculation device 1 includes hardware included in a general computer, and includes a communication device and the like for communicating with the outside via the Internet or the like.

FIG. 2 is a block diagram showing the functional configuration of the shake index value calculation device 1 of this embodiment in which the shake index value calculation program P described above is installed. As shown in this figure, the shaking index value calculation device 1 of this embodiment includes an initial setting unit 11, an evaluation position setting unit 12, an option selection unit 13, and a structure response calculation unit 14 (acceleration calculation unit). , a vibration period calculator 15 , a shake index value calculator 16 , and an output unit 17 . Note that these functional units included in the shake index value calculation device 1 of the present embodiment are embodied by the above-described hardware.

The initial setting unit 11 stores structure data D1 of a structure for calculating a shaking index value, simulation seismic wave data D2 used to calculate the shaking index value, and ground data indicating characteristics of the ground on which the structure is installed. Make settings. For example, when there are a plurality of structure data D1 and a plurality of simulation seismic data D2, the initial setting unit 11 receives one of the plurality of structure data D1 and a plurality of simulation seismic data D2 from the input device 5, for example. determined based on the input command of

The simulation seismic data D2 is data representing seismic waves, and indicates how the ground vibrates during a certain period of time. As such simulation seismic wave data D2, past seismic wave data that actually occurred can be used. By using the past seismic wave data as the simulation seismic data D2 in this way, it becomes easier to imagine how the structure will shake in the event of an earthquake.

Based on the shaking index value calculation program P, the evaluation position setting unit 12 sets a plurality of evaluation positions for the structure indicated by the structure data D1 determined by the initial setting unit 11 . For example, if the structure is a building with multiple floors, an evaluation position is set for each floor. This evaluation position indicates the position for obtaining the shake index value. That is, according to the shake index value calculation device 1 of the present embodiment, the shake index value is calculated for each evaluation position. Note that the evaluation position setting unit 12 sets the evaluation position based on an input command from the input device 5, for example.

Such an evaluation position setting unit 12 is embodied by operating the shake index value calculation device 1, which is a computer, based on the shake index value calculation program P. As shown in FIG. In other words, the shake index value calculation program P causes the shake index value calculation device 1, which is a computer, to function as the evaluation position setting unit 12 that sets a plurality of evaluation positions on the structure.

The option selection unit 13 selects an earthquake countermeasure option to be provided for the structure based on the shaking index value calculation program P. FIG. For example, data indicating a plurality of earthquake countermeasure options are stored in the storage device 3, and the option selection unit 13 selects one or more earthquake countermeasure options based on an input command from the input device 5, for example. . Note that selection of the earthquake countermeasure option by the option selection unit 13 is not essential, and it is possible to calculate the shaking index value without applying the earthquake countermeasure option to the structure.

Such an option selection unit 13 is embodied by operating the shake index value calculation device 1, which is a computer, based on the shake index value calculation program P. FIG. In other words, the shaking index value calculation program P causes the shaking index value calculation device 1, which is a computer, to function as the option selection unit 13 that selects the earthquake countermeasure option provided for the structure.

Such earthquake countermeasure options are not particularly limited, and mean countermeasures capable of reducing the shaking of structures when an earthquake occurs. For example, earthquake countermeasure options include bracing, dampers, springs, load-bearing walls, steel pipe piles, joint hardware, vibration isolation rubber, and the like. When one or more of these earthquake countermeasure options are selected, the option selection unit 13 incorporates data indicating these earthquake countermeasure options into the structure data D1 of the structure set by the initial setting unit 11. . As a result, the structure data D1 of the structure provided with the anti-earthquake option is created.

Based on the shaking index value calculation program P, the structure response calculator 14 calculates a response value to seismic waves for each evaluation position obtained by inputting simulation seismic waves to the structure. Here, the structure response calculator 14 obtains acceleration, velocity, displacement, cross-sectional force, etc. as response values for each evaluation position with respect to seismic waves. The structure response calculation unit 14 calculates a response value to seismic waves for each evaluation position by performing time history response analysis, for example. The structure response calculation unit 14 can also calculate the response value to the seismic wave for each evaluation position by calculating the allowable stress degree and the like and the critical strength calculation.

Such a structure response calculation unit 14 is embodied by operating the shaking index value calculation device 1, which is a computer, based on the shaking index value calculation program P. FIG. In other words, the sway index value calculation program P causes the sway index value calculation device 1, which is a computer, to function as an acceleration calculator that calculates the acceleration for each evaluation position obtained by inputting simulation seismic waves to the structure.

The vibration period calculation unit 15 uses the response acceleration obtained by the structure response calculation unit 14 based on the shaking index value calculation program P to obtain the vibration period based on the natural period of the structure for each evaluation position. That is, the vibration period calculator 15 obtains the vibration period for each evaluation position when the simulation seismic wave is input to the structure based on the natural period of the structure. Here, the vibration period calculator 15 Fourier-transforms the temporal change in the response acceleration for each evaluation position obtained by the structure response calculator 14, and sets the dominant period that exerts the greatest influence on the evaluation position as the vibration period. Calculate for each evaluation position.

Such a vibration period calculation unit 15 is embodied by operating the shake index value calculation device 1, which is a computer, based on the shake index value calculation program P. As shown in FIG. In other words, the sway index value calculation program P causes the sway index value calculation device 1, which is a computer, to calculate the vibration period for each evaluation position when simulation seismic waves are input to the structure based on the natural period of the structure. It functions as the vibration period calculator 15 .

The sway index value calculation unit 16 calculates the sway for each evaluation position based on the sway index value calculation program P, based on the acceleration obtained by the structure response calculation unit 14 and the vibration period obtained by the vibration period calculation unit 15. Find the index value. For example, the shaking index value calculator 16 applies the maximum acceleration and dominant period at each evaluation position to a graph showing the relationship between the period and acceleration and seismic intensity announced by the Meteorological Agency, and calculates the seismic intensity at each evaluation position. Calculated as a shaking index value. Note that the shaking index value is not limited to the seismic intensity as long as it is a value obtained from the relationship between the velocity and the vibration period.

Such a shake index value calculation unit 16 is embodied by operating the shake index value calculation device 1, which is a computer, based on the shake index value calculation program P. As shown in FIG. In other words, the shake index value calculation program P uses the computer shake index value calculation device 1 to calculate the shake index value for each evaluation position based on the acceleration and the vibration period. It functions as an index value calculation unit.

The output unit 17 visualizes and outputs the shake index value obtained by the shake index value calculation unit 16 for each evaluation position. For example, when the output device 6 is a display, the evaluation position is set to each floor of the structure, and the shaking index value is the seismic intensity, the output unit 17 displays the seismic intensity of each floor of the structure on the display. It will be.

FIG. 3 is a flow chart showing a process of calculating a shake index value (shake index value calculation method) using the shake index value calculation device 1 of the present embodiment.

As shown in this figure, when calculating a shake index value, initial setting is first performed by the initial setting unit 11 (step S1). Here, for example, the operator uses the input device 5 to select the structure data D1, the ground data, and the seismic wave data for simulation D2. When data is selected in this way, the selected data is stored by the initial setting section 11, and necessary initial settings are made.

Next, an evaluation position is set (step S2). Here, for example, the operator uses the input device 5 to select a plurality of evaluation positions in the structure indicated by the structure data D1. When the evaluation positions are selected in this way, the evaluation position setting unit 12 sets the evaluation positions at a plurality of positions of the structure. Such a process of step S2 corresponds to an evaluation position setting process of setting a plurality of evaluation positions on the structure.

Subsequently, an earthquake countermeasure option is selected (step S3). Here, for example, the operator uses the input device 5 to select an earthquake countermeasure option stored in advance in the storage device 3 . When an earthquake countermeasure option is selected in this manner, the option selection unit 13 determines the earthquake countermeasure option, and incorporates data indicating the earthquake countermeasure option into the structure data D1. Such a process of step S3 corresponds to an option selection process of selecting an earthquake countermeasure option provided for a structure prior to a structure response calculation process (a process including an acceleration calculation process), which will be described later.

It should be noted that it is also possible not to select addition of the anti-earthquake option in step S3. In such a case, the process proceeds to step S4 without incorporating the data indicating the earthquake countermeasure option into the structure data D1 set in step S1.

Subsequently, the structure response is calculated (step S4). Here, based on the structure data D1 and the simulation seismic wave data D2, the structure response calculator 14 calculates response values (acceleration, velocity, displacement, sectional force, etc.) when the simulation seismic waves are input to the structure. is calculated for each evaluation position. For example, the structure response calculator 14 calculates a response value to seismic waves for each evaluation position by performing time history response analysis. The process of step S4 corresponds to the structure response calculation process of calculating the response value for each evaluation position obtained by inputting the simulation seismic wave to the structure, and the acceleration calculation process for calculating the acceleration for each evaluation position. It is a process including a process.

Note that if the addition of the earthquake countermeasure option is selected in step S3, the structure response calculation unit 14 calculates the acceleration and the like for each evaluation position based on the structure provided with the earthquake countermeasure option. .

Subsequently, a vibration period is calculated for each evaluation position (step S5). Here, based on the acceleration obtained in step S4 by the vibration period calculator 15 and the natural period of the structure stored in advance in the storage device 3, the evaluation in the case where the simulation seismic wave is input to the structure Obtain the vibration period for each position. In this embodiment, the change over time of the acceleration (response acceleration) calculated by the structure response calculator 14 is Fourier transformed, and the dominant period that exerts the greatest influence on the evaluation position is calculated as the vibration period. . Such a process of step S5 corresponds to a vibration period calculation process for calculating the vibration period for each evaluation position when the simulation seismic wave is input to the structure based on the natural period of the structure.

It should be noted that if the addition of the earthquake countermeasure option is selected in step S3, the vibration period calculator 15 calculates the vibration period for each evaluation position based on the structure provided with the earthquake countermeasure option.

Subsequently, a shake index value is calculated for each evaluation position (step S6). Here, the shaking index value calculator 16 calculates the seismic intensity as the shaking index value for each evaluation position based on the acceleration obtained in step S4 and the vibration period obtained in step S5. FIG. 4 is a relational diagram showing the relationship between maximum acceleration, dominant period, and seismic intensity. The shaking index value calculation unit 16 calculates the seismic intensity from the position of the intersection of the maximum acceleration and the dominant period based on the data representing the relationship diagram shown in FIG. 4, for example. Such a process of step S6 corresponds to a shake index value calculation process of obtaining a shake index value for each evaluation position based on the acceleration and the vibration period.

Subsequently, the seismic intensity, which is the shaking index value obtained in step S6, is output for each evaluation position (step S7). Here, the output unit 17 outputs the seismic intensity obtained in step S6 for each evaluation position. For example, if the structure is a multi-story building and evaluation positions are set for each floor of the building, the seismic intensity of each floor of the building is output.

According to the sway index value calculation device 1, the sway index value calculation method, and the sway index value calculation program P of the present embodiment, each of the plurality of evaluation positions set on the structure before an earthquake occurs , the sway index value can be indicated based on the acceleration and the vibration period. Therefore, according to the sway index value calculation device 1, the sway index value calculation method, and the sway index value calculation program P of the present embodiment, it is possible to appropriately select earthquake countermeasures necessary for a structure for each evaluation position. Become.

In addition, in the shaking index value calculation device 1, the shaking index value calculation method, and the shaking index value calculation program P of the present embodiment, an earthquake countermeasure option provided for the structure can be selected, and when the earthquake countermeasure option is selected, calculated the acceleration and vibration period for each evaluation position based on the structure with the earthquake countermeasure option. For this reason, it is possible to obtain the shaking index value when the earthquake countermeasure option is installed in the structure. Changes in index values can be easily grasped.

Here, a specific calculation example by the shake index value calculation device 1 of this embodiment will be described. In this calculation example, the model M of a four-story building shown in FIG. 5 is used as the structure data D1 before selecting the earthquake countermeasure option. A type (non-reinforced type) shown in FIG. 5 that is not provided with an earthquake countermeasure option for such model M, and a type that is provided with bracing B as an earthquake countermeasure option as shown in FIG. (bracing reinforced type) and a type (spring and damper reinforced type) provided with a seismic control mechanism S including springs and dampers as an option for earthquake countermeasures as shown in FIG. did the calculations.

In addition, in this calculation example, the seismic wave data of the western Tottori prefecture earthquake that occurred on October 6, 2000 with the epicenter in the western part of Tottori prefecture was used as the simulation seismic wave data D2. In this calculation example, evaluation positions were set for each of the 1st to 4th floors of Model M, which is a four-story building, and the roof, and the seismic intensity was obtained as a shaking index value for each evaluation position.

FIG. 8 is a table showing the results of calculations performed for the unreinforced type. As shown in FIG. 8, the dominant period was 0.36 seconds on each floor from the 1st to 4th floors and on the roof. The maximum acceleration on the 1st floor is 117.2 cm/ ^s2 , the maximum acceleration on the 2nd floor is 177.6 cm/ ^s2 , the maximum acceleration on the 3rd floor is 422.7 cm/ ^s2 , and the maximum acceleration on the 4th floor is 177.6 cm/s2. The maximum acceleration was 632.0 cm/s ² and the maximum roof acceleration was 772.7 cm/s ² .

FIG. 9 is a diagram in which the maximum acceleration and dominant period at each evaluation position obtained by calculation for the unreinforced type are applied to the relationship diagram (seismic intensity scale diagram) shown in FIG. As shown in this figure, the seismic intensity of the non-reinforced type is 5 lower on the 1st floor, 5 upper on the 2nd floor, 6 lower on the 3rd floor, 6 upper on the 4th floor, and 6 on the roof. became strong.

FIG. 10 is a table showing the results of calculations performed for bracing reinforcement types. As shown in FIG. 10, the dominant period was 0.17 seconds on each floor from the 1st to 4th floors and on the roof. The maximum acceleration on the 1st floor is 116.8 cm/ ^s2 , the maximum acceleration on the 2nd floor is 119.4 cm/ ^s2 , the maximum acceleration on the 3rd floor is 164.6 cm/ ^s2 , and the maximum acceleration on the 4th floor is 164.6 cm/s2. The maximum acceleration was 254.2 cm/s ² and the maximum roof acceleration was 349.1 cm/s ² .

FIG. 11 is a diagram in which the maximum acceleration and dominant period at each evaluation position obtained by calculation for the bracing reinforcement type are applied to the relationship diagram (seismic intensity scale diagram) shown in FIG. As shown in this figure, in the bracing reinforcement type, the seismic intensity of the 1st floor is 4, the 2nd floor is 4, the 3rd floor is 5 lower, the 4th floor is 5 lower, and the roof is 5 upper. became.

FIG. 12 is a table showing the results of calculations performed for spring and damper reinforcement types. As shown in FIG. 12, the dominant period was 0.92 seconds on each floor from the 1st to 4th floors and on the roof. The maximum acceleration on the 1st floor is 114.7 cm/ ^s2 , the maximum acceleration on the 2nd floor is 124.0 cm/ ^s2 , the maximum acceleration on the 3rd floor is 133.6 cm/ ^s2 , and the maximum acceleration on the 4th floor is 133.6 cm/s2. The maximum acceleration was 164.1 cm/s ² and the maximum roof acceleration was 189.7 cm/s ² .

FIG. 13 is a diagram in which the maximum acceleration and dominant period at each evaluation position obtained by calculation for the spring and damper reinforcement type are applied to the relationship diagram (seismic intensity scale diagram) shown in FIG. As shown in this figure, in the bracing reinforcement type, the seismic intensity of the 1st floor is 5 upper, the 2nd floor is 5 upper, the 3rd floor is 5 upper, the 4th floor is 5 upper, and the roof has a seismic intensity of 5 upper. It became less than 6.

FIG. 14 is a table summarizing the seismic intensity at each evaluation position obtained for the unreinforced type, the bracing reinforced type, and the spring and damper reinforced type. From this figure, it is easy to understand that if an earthquake similar to the Western Tottori Earthquake occurs, reinforcement by bracing is more effective in reducing the shaking of structures than no reinforcement or spring and damper reinforcement. .

(Second embodiment)
Next, a second embodiment of the invention will be described with reference to FIG. In the description of the present embodiment, the description of the same parts as those of the first embodiment will be omitted or simplified.

FIG. 15 is a flow chart showing a process of calculating a shake index value (shake index value calculation method) using the shake index value calculation device of the present embodiment. In this embodiment, a plurality of earthquake countermeasure options are selected in step S3. In the present embodiment, between steps S6 and S7 in the first embodiment, a determination step ( Step S10) is newly provided. If it is determined in step S10 that the shaking index value has not been calculated using all the earthquake countermeasure options, the option selection unit 13 changes the earthquake countermeasure option (step S11), and returns to step S4. . The steps S10 and S11 are performed by the shake index value calculation device 1 based on the shake index value calculation program P. FIG. Thus, according to the present embodiment, the earthquake countermeasure option selected in the previous option selection process is changed after the previous shake index value calculation process.

In this embodiment, the earthquake countermeasure option selected in step S3 is changed one by one, and the shaking index value for each evaluation position of the structure is calculated for each of the earthquake countermeasure options. . Therefore, according to this embodiment, it is possible to easily understand the effects of different earthquake countermeasure options.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above embodiments. The various shapes, combinations, and the like of the constituent members shown in the above-described embodiment are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

For example, in the above embodiment, when the structure is a building with multiple floors, the configuration has been described in which one evaluation position is set for each floor. However, the invention is not limited to this. For example, it is possible to set a plurality of evaluation positions for each floor.

Reference Signs List 1: shaking index value calculation device, 11: initial setting unit, 12: evaluation position setting unit, 13: option selection unit, 14: structure response calculation unit (acceleration calculation unit), 15: vibration cycle Calculation unit 16 Shake index value calculation unit 17 Output unit D1 Structure data D2 Seismic wave data for simulation P Shake index value calculation program

Claims (9)

A shaking index value calculation method for obtaining a shaking index value indicating the degree of shaking caused by an earthquake, comprising:
an evaluation position setting step of setting a plurality of evaluation positions in the structure data ;
an acceleration calculation step of calculating a maximum acceleration for each of the evaluation positions obtained by inputting simulation seismic waves into the structure data ;
a vibration period calculation step of calculating a dominant period for each of the evaluation positions when the simulation seismic wave is input to the structure data , based on the natural period of the structure ;
and a shaking index value calculating step of obtaining a shaking index value for each of said evaluation positions based on said maximum acceleration and said dominant period. An option selection step of selecting an earthquake countermeasure option provided in the structure data prior to the acceleration calculation step;
In the acceleration calculation step, the maximum acceleration for each evaluation position is calculated based on the structure data provided with the earthquake countermeasure option, and in the vibration period calculation step, the structure provided with the earthquake countermeasure option 2. The shake index value calculation method according to claim 1, wherein the dominant period for each of the evaluation positions is calculated based on object data . 3. The shake index value calculation method according to claim 2, wherein after the shake index value calculation step, the earthquake countermeasure option selected in the previous option selection step is changed. A shaking index value calculation device for obtaining a shaking index value indicating the degree of shaking caused by an earthquake,
an evaluation position setting unit that sets a plurality of evaluation positions in the structure data ;
an acceleration calculation unit that calculates a maximum acceleration for each of the evaluation positions obtained by inputting simulation seismic waves to the structure data ;
a vibration period calculation unit that calculates a dominant period for each of the evaluation positions when the simulation seismic wave is input to the structure data , based on the natural period of the structure ;
A shake index value calculation device, comprising: a shake index value calculation unit that calculates a shake index value for each of the evaluation positions based on the maximum acceleration and the dominant period. an option selection unit for selecting an earthquake countermeasure option provided in the structure data ;
The acceleration calculation unit calculates the maximum acceleration for each evaluation position based on the structure data provided with the earthquake countermeasure option,
5. The shaking index value calculation device according to claim 4, wherein the vibration period calculation unit calculates the dominant period for each of the evaluation positions based on the structure data provided with the earthquake countermeasure option. The option selection unit changes the earthquake countermeasure option selected by the option selection unit,
The acceleration calculation unit calculates the maximum acceleration for each evaluation position based on the structure data provided with the changed earthquake countermeasure option,
6. The shaking index value calculation according to claim 5, wherein the vibration period calculation unit calculates the dominant period for each of the evaluation positions based on the structure data provided with the changed anti-earthquake countermeasure option. Device. A shake index value calculation program for causing a computer to calculate a shake index value,
the computer,
an evaluation position setting unit that sets a plurality of evaluation positions in the structure data ;
an acceleration calculation unit that calculates a maximum acceleration for each of the evaluation positions obtained by inputting simulation seismic waves to the structure data ;
a vibration period calculation unit that calculates a dominant period for each of the evaluation positions when the simulation seismic wave is input to the structure data , based on the natural period of the structure ;
A shake index value calculation program characterized by functioning as a shake index value calculator that calculates a shake index value for each of said evaluation positions based on said maximum acceleration and said dominant period. the computer,
Function as an option selection unit for selecting an earthquake countermeasure option provided in the structure data ,
functioning as the acceleration calculation unit for calculating the maximum acceleration for each evaluation position based on the structure data provided with the earthquake countermeasure option;
8. The shaking index value calculation program according to claim 7, wherein the shaking index value calculation program functions as the vibration period calculation unit that calculates the dominant period for each of the evaluation positions based on the structure data provided with the earthquake countermeasure option. the computer,
The acceleration calculation functioning as the option selection unit for changing the previously selected earthquake countermeasure option, and calculating the maximum acceleration for each of the evaluation positions based on the structure data provided with the changed earthquake countermeasure option. function as a department,
9. The shaking index value according to claim 8, characterized by functioning as said vibration period calculation unit for calculating said dominant period for each said evaluation position based on said structure data provided with said changed anti-earthquake countermeasure option. calculation program.

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