JP2006078272A - Earthquake risk evaluation system and building selection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earthquake risk evaluation system capable of acquiring a clear and highly-reliable earthquake risk evaluation result, and a building selection method capable of acquiring easily consensus of a building purchaser. <P>SOLUTION: This earthquake risk evaluation system 2B(2) is constituted of a region setting means 21 for setting an optional region where the earthquake risk evaluation is performed, a ground characteristic storage means 22 for storing a subsurface ground characteristic of each region, a ground amplification rate calculation means 23 for calculating the ground amplification rate in an optional region based on the ground characteristic storage means 22, a region classification means 24 for classifying the optional region relative to each ground amplification rate calculated by the ground amplification rate calculation means 23 and producing an earthquake risk map, a geographic information storage means 25 for storing geographic information data comprising longitude and latitude data at each specific spot in the optional region, and an earthquake risk display means 26 for plotting the specific spot taken out from the geographic information storage means 25 on the earthquake risk map. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seismic risk evaluation system in an arbitrary area or a specific point in the area, and a method of selecting a building based on the seismic risk evaluation, and in particular, performs a highly reliable seismic risk evaluation. Seismic risk assessment system and building selection that can provide seismic risk assessment results that accurately reflect the location information of the desired point, and that can select buildings of an appropriate structure type according to the seismic risk assessment Regarding the method.

  Recently, as one of the decisive factors when purchasing a building such as a house or office building, the building is located in the first place as well as whether or not the building has sufficient seismic performance. Whether or not the area is a seismic hazard area has become an extremely important factor. Since the Hyogoken-Nanbu Earthquake, a national-scale seismic observation network has been developed, and earthquake countermeasures against Tokai, Tonankai and Nankai earthquakes, which are expected to occur in the near future, are also in countries and regions. The current situation is that it is being promoted. Under such circumstances, when building a house or office building in a desired area or place or purchasing a house in the desired area, it is extremely important to recognize the earthquake risk in that area. At the same time, there is also a great demand for knowing the degree of earthquake risk. In the first place, since buildings with earthquake-resistant performance corresponding to earthquake scales that differ from region to region (this is also included in the earthquake risk) are built, the earthquake risk is directly reflected in the construction cost, and earthquake insurance The amount of burden varies depending on the earthquake risk.

  When assessing the seismic risk of a specific area, assuming the occurrence of an earthquake at any source, identify the ground motion on the ground surface at a specific point, taking into account the propagation of seismic waves in the ground (distance attenuation, etc.) The risk is evaluated including the possibility of liquefaction. Assuming the occurrence of an earthquake, a fault model is created from active faults identified based on past earthquake records and various surveys. From the fault angle and direction, the speed and amount of deviation, etc. Assumes an earthquake at any source.

In Patent Document 1, a target earthquake risk at an arbitrary point is set, and after analyzing the degree of damage, seismic performance, and cost constraints of each part of the building to be designed, within a range that satisfies the target earthquake risk. An earthquake-resistant design processing apparatus and method for calculating a design specification that minimizes the cost is disclosed. In the conventional seismic design method, the seismic design is carried out under the design method defined by the Building Standards Act, etc., with different degrees of seismic risk (scale of set ground motion) for each region. However, since the regional differences in the magnitude of such earthquakes are extremely rough, unlike the actual ones, it cannot be said that the earthquake risk of a specific region or a specific point is sufficiently reflected in the design. The invention disclosed in Patent Document 1 has been devised to solve this problem. Here, the target earthquake risk is a risk that is set such that the earthquake risk for earthquake motion with a recurrence period of several hundred years is several percent. This earthquake risk is calculated by classifying the damage amount according to the degree of damage to the foundation, structure, equipment, etc. of the building, and calculating the expected loss at the time of the earthquake from the damage amount and the probability of occurrence of each damage. The ratio of loss (repair cost) to construction cost is set to several percent. In such an apparatus and method, an earthquake occurrence model is set from historical earthquake data, active fault data, etc. in the earthquake risk analysis, and the distance attenuation from the earthquake occurrence point to the building construction point is calculated. A hazard curve or hazard map is output.
Japanese Patent Laid-Open No. 2003-155776

  According to the earthquake-resistant design processing apparatus and method disclosed in Patent Document 1, it is possible to design a building in a target area against an assumed earthquake at an optimum cost. Since the target earthquake risk is calculated from the assumed earthquake scale and the period of recurrence, and a building with seismic performance that satisfies the earthquake risk is designed, the performance and required construction cost must be rationalized. Can do.

  However, it is a design method based on earthquake source information, and the source information is only an assumption of an earthquake that will occur in the first place. It is hard to say that the reliability of the calculation results is high due to the existence of deterministic factors. Furthermore, as the amount of hypocenter information assumed increases, the amount of calculation becomes enormous, and the evaluation becomes complicated, resulting in a calculation result lacking in clarity. In order for the design method to provide the customer with an earthquake risk determined by the customer himself / herself or convinced by the customer and a building with seismic performance corresponding to the earthquake risk, the customer must understand. Buildings need to be designed, built and delivered based on easy design techniques.

  The seismic risk evaluation system and the building selection method of the present invention have been made in view of the above-mentioned problems, and eliminate uncertain elements by adopting the seismic risk evaluation method that does not depend on the epicenter information. The purpose is to provide a seismic risk assessment system that is highly reliable and easy for consumers to understand. It is another object of the present invention to provide a seismic risk evaluation system that accurately reflects position information of a target specific area for which an actual seismic risk evaluation result is desired. A further object of the present invention is to provide a building selection method that allows a consumer to select an appropriate building from among a plurality of building types designed according to the above-described highly reliable earthquake risk assessment results. To do.

  In order to achieve the above object, an earthquake risk evaluation system according to the invention described in claim 1 calculates an earthquake risk based on surface ground characteristics of an arbitrary area, and calculates an earthquake risk at a specific point in the arbitrary area. An earthquake risk evaluation system for evaluating, based on an area setting means for setting an arbitrary area for earthquake risk evaluation, a ground characteristic storage means for storing surface layer characteristics for each area, and the ground characteristic storage means A ground amplification factor calculating means for calculating a ground amplification factor in the arbitrary area, and a region classification means for dividing the arbitrary area for each ground amplification factor calculated by the ground amplification factor calculating means and creating an earthquake risk map It is characterized by comprising.

  The earthquake risk assessment system described above uses a computer composed of a CPU and memory and a series of hardware composed of a mouse, a keyboard, a display, and the like, and the system comprising various means is executed on the computer.

First, the region setting means narrows down the region by setting the region in which the earthquake risk is to be evaluated by typing in the keyboard and setting the latitude and longitude ranges of the region. Here, an earthquake risk map described later is created and displayed based on longitude and latitude information data, and therefore needs to be input as longitude and latitude information data in setting the target area. For example, the target range can be set by inputting the data of the longitude and latitude of the upper left and lower right defining the rectangular range. As the data at the time of input, an input data form such as “0 degrees 0 minutes 0 seconds 0/10 seconds” can be taken for each north latitude and east longitude. Furthermore, the set target area can be further divided into a plurality of areas. This corresponds to the creation of a seismic risk map displayed in different colors for each ground amplification factor described later. In addition to inputting the longitude and latitude information data of the target range described above, the meshon division number of the target area can be arbitrarily input and set. As this input data form, an appropriate form such as a form for directly inputting the number of mesh divisions or an input form in which the number of divisions for each of longitude and latitude is in units of 0 second can be selected. In addition, well-known conversion software can also be used. For example, by inputting the address information on the register, it is automatically converted into longitude and latitude information data corresponding to the address information, and the computer reads the converted data.

  Next, the ground gain calculation means calculates the ground gain in the region based on the ground characteristic storage means stored in the computer. The ground characteristic storage means stores, for example, ground characteristic data of the surface layer ground in various parts of the country. Here, the “surface ground” means the ground on the engineering foundation. This engineering foundation can be defined as a stratum having an S wave velocity of seismic motion of about 400 m / sec or more and a considerable thickness. Since most ground where buildings are constructed is relatively soft surface ground consisting of alluvium and landfill, the response of the ground surface during an earthquake is strongly affected by the ground characteristics (vibration characteristics) of the surface ground. It will be. Therefore, even if the earthquakes are the same, if the ground characteristics of the surface layer are different, the magnitude of the ground motion that appears on the ground surface will also be different. In other words, when the earthquake motion incident from the basement (engineering basement) propagates upward to the ground surface, the magnitude of the earthquake is amplified by the ground characteristics of the surface ground. The component of the ground motion is amplified by the resonance phenomenon in the ground having the natural period corresponding to each natural period, and is transmitted to the ground surface. The ratio of the earthquake magnitude at the ground surface to the earthquake magnitude at this base is called the ground amplification factor. The seismic risk assessment system according to the present invention eliminates seismic source information that contains many uncertain elements and the propagation of seismic motion from the seismic source, etc. It is used as an index of Therefore, since the evaluation result depends only on the characteristics peculiar to the ground, the reliability of the result is high, and the evaluation system is clear and easy to understand. Therefore, general building purchasers who are not familiar with seismic engineering can fully judge the validity of the building purchase place after having fully satisfied the evaluation results.

  The data stored in the ground property storage means include the layer structure of the surface layer, the thickness of each layer, the ground conditions (such as softness of the ground, whether the ground is sandy, gravel or viscous ground), N value, unit volume There are dynamic properties such as weight, groundwater level, shear elastic wave velocity, Poisson's ratio and damping constant. In addition, depending on the method for calculating the amplification factor in the ground, as will be described later, the ground characteristic data may be composed of the topographic classification and altitude by the fine topographic classification, the distance from the main river, and the like. That is, since the data required by the calculation method applied by the ground amplification factor calculation means is different, data corresponding to the calculation method is stored in the storage means.

  By narrowing down the target area by the area setting means, the ground characteristic data of the area is also narrowed down, and the narrowed ground characteristic data is sent to the ground gain calculation means. This ground characteristic data may be automatically sent to the ground amplification factor calculating means, or the ground characteristic data can be taken in after calling the ground amplification factor calculating means with a mouse or a keyboard.

  Since there are various methods for calculating the amplification factor in the ground amplification factor calculation means, the calculation method can be arbitrarily selected from a plurality of calculation methods, or the calculation is performed according to a specific calculation method set in advance. It can also be set as the structure made.

  Create an aggregate data list based on the calculation result of the amplification factor, create an earthquake risk map in which the target area is divided for each amplification factor based on the aggregate data list, and display the map on the display Is a means of regional segmentation. For example, the ground amplification factor is in the range of 1.0 to 1.5, 1.5 to 2.0, 2.0 to 2.5, 2.5 to 3.0, 3.0 or more. It is possible to display a risk map that is classified into each range and is color-coded for each range based on the calculation result of the amplification factor. As a display form of the seismic risk map, a display form in which the target area is divided by a grid mesh and the inside of the mesh is color-coded for each ground amplification factor is conceivable.

  As will be described later, if it is possible to roughly identify a specific point on the displayed earthquake risk map without having to drop it into the earthquake risk map of a specific point in the target area, you will be charged. The seismic risk evaluation system according to Item 1 can confirm the seismic risk of one or more specific points.

  The earthquake risk evaluation system according to the invention described in claim 2 calculates an earthquake risk based on the surface ground characteristics of an arbitrary area, and evaluates the earthquake risk at a specific point in the arbitrary area. An evaluation system comprising: an area setting means for setting an arbitrary area for earthquake risk assessment; a ground characteristic storage means for storing surface layer characteristics for each area; and a ground characteristic storage means based on the ground characteristic storage means. A ground amplification factor calculating means for calculating a ground amplification factor, a region classification means for creating an earthquake risk map by dividing the arbitrary region for each ground amplification factor calculated by the ground amplification factor calculating unit, and the arbitrary region Geographic information storage means for storing geographical information data consisting of longitude and latitude data for each specific point in the area, and the specific point extracted from the geographical information storage means And earthquake risk display means for plotted on the risk map, characterized in that it consists of.

  The area setting means, the ground characteristic storage means, the ground gain calculation means, and the area classification means are the same as described above. Following the area classification means, the specific point where the building is constructed or the specific point where the building is located is specified in the target area. The geographical information of the specific point is taken out from the geographical information storage means stored in the computer and the geographical information data of the specific point is stored, dropped into the earthquake risk map described above, and the specific point is displayed on the earthquake risk map described above. Plotted (earthquake risk display means). Here, the geographic information data of a specific point is composed of longitude and latitude data of the point. In addition to the method of inputting longitude and latitude directly from the keyboard, the address information data is converted into corresponding longitude and latitude information data by inputting the address information, as will be described later. There is a method to store by. According to the earthquake risk evaluation system according to claim 2, in addition to the effect of the invention according to claim 1, the earthquake at the specific point on the earthquake risk map in which the specific point is specifically specified. It is possible to check the degree of danger.

  Further, in the earthquake risk evaluation system according to the invention of claim 3, the geographical information storage means stores geographical information data created by converting the inputted address information data into longitude and latitude information data. When the converted geographic information data is converted to an accuracy that can identify the specific point, storage of the geographic information data is completed, and the converted geographic information data can identify the specific point. If the accuracy is not converted, the storage of geographic information data is completed after conversion to an identifiable accuracy.

  Here, “address information data” is, for example, data on a registry such as “00 prefecture XX city △ △ town 5-3 address”, and when such address information data is input, the address information Is converted into longitude and latitude data corresponding to. For such conversion work, known conversion software can be used.

In the conversion of the address information, it is preferable to make it possible to rank the conversion accuracy so that the degree of conversion can be visually recognized. For example, rank 1 is the case that can be converted only within a wide range of prefecture levels, rank 2 if it can be converted to the municipal level, rank 3 in the town level, rank 4 in the ding level, block level Is rank-ranked as rank 6 when it can be converted to rank 5 and address level. This rank display can display the rank (accuracy) that can be converted at the same time as the address conversion. For example, by setting an arbitrary rank accuracy (when conversion is possible with an accuracy of rank 4 or higher) If the setting accuracy is satisfied, the storage of the geographic information data is completed. Here, the rank accuracy to be set is the longitude and latitude information data accuracy that can identify a specific point in the target area. Depending on the region and location, a specific point can be identified at the Ding level, or the location may not be identified unless it is identified up to the street number level, so it is necessary to set the conversion accuracy for each target region or specific point It is because. Therefore, for example, when inputting the address information data on the register, it is preferable to set the conversion accuracy according to the address information data. If the accuracy after the conversion is confirmed and the result does not satisfy the setting accuracy, the storage of the geographic information data can be completed by directly manually inputting the longitude and latitude information data of the specific location, for example.

  It is also possible to display a specific point on the earthquake risk map by separately displaying the specific point on a map using known map software and superimposing it on the above-described earthquake risk map. Thus, it is possible to provide the customer with a highly reliable earthquake risk evaluation result by accurately plotting a specific point on which the earthquake risk evaluation is desired on the earthquake risk map.

  The seismic risk evaluation system according to the invention described in claim 4 comprises a danger area composed of a ground amplification factor exceeding a danger reference value and a certain area around the danger area, and the danger possibility area is formed. The area is displayed on the earthquake risk map.

  The ground characteristics of each region, especially the stratum structure and stratification of the strata, vary in a longitudinal section, and the ground characteristic data stored in the ground characteristic storage means are implemented at predetermined intervals. This is set based on existing boring data. Therefore, it is difficult to say that such ground characteristic data reflect the actual stratification condition in detail, so even if a specific point is accurately dropped on the earthquake risk map, the earthquake risk map itself is not specified. There may also be a problem that the seismic risk at the site is not fully evaluated. In particular, when the specific point is near the boundary of the color classification on the earthquake risk map, the actual judgment becomes difficult.

  Therefore, for example, a ground amplification factor of 2.0 is set as a danger reference value, an area exceeding this danger reference value is set as a danger area, and a range having a certain area spread around this danger area is also a danger possible area. And By displaying a line indicating this dangerous area on the seismic risk map, it is possible to perform an evaluation on the safety side that has absorbed an error of the seismic risk map, that is, a position error of the ground property data. For example, if the displayed earthquake risk map is displayed separated by a mesh with a predetermined width, add 2 meshes outside the mesh area indicating the dangerous area to make it a dangerous area, and add 2 meshes. It is possible to easily determine the positional relationship between the specific point and the dangerous area by displaying the outline of the line with a thick line. Furthermore, it is also possible to adopt a configuration in which the address data resulting from being included in the dangerous area is displayed in a table format among the addresses stored in the geographic information storage means. In this case, in addition to confirming the seismic risk by a person who intends to construct a building in a specific area or a specific point in the future, a person who has already lived in a specific area will be able to ) Earthquake risk can be confirmed anew, and incentives such as providing earthquake-resistant reinforcements for homes based on such earthquake risk assessment results are more likely to work.

  Furthermore, the building selection method according to the invention described in claim 5 evaluates the earthquake risk of the specific point based on the earthquake risk evaluation system, and has a plurality of structures having seismic performance according to the earthquake risk. It is characterized by being able to select any building from among the buildings of the form.

It is not possible to provide customers with buildings based on seismic design based on the earthquake risk peculiar to the region, rather than designing based on the Building Standards Act, etc., in which the magnitude of the earthquake is regulated based on a wide area classification as before. It is easy to obtain consumer consensus, and construction of buildings can be performed at an optimal construction cost. When designing a building according to a certain degree of earthquake risk, a structure that resists earthquakes due to the rigidity (rigid structure) of the building, or a structure that resists earthquakes with a flexible structure equipped with seismic isolation devices, vibration control devices, etc. In addition, there are various structures including both of them, so that the side providing the building can also provide the building of a plurality of structural types. According to the building selection method described above, the consumer can select from a plurality of structural forms with seismic performance (can be built at the optimal construction cost) required at the specific point. It is possible to purchase a building having a desired design in a desired structural form.

  As can be understood from the above description, according to the seismic risk evaluation system of the present invention, it is possible to perform seismic risk evaluation of a specific area with high reliability. In addition, it is possible to provide a clear seismic risk evaluation result that is easy to understand for ordinary people who are not familiar with seismic design. In addition, it is possible to accurately reflect the position of a specific point where you want to obtain an earthquake risk assessment to the earthquake risk map and to provide safety-side assessment results that take into account the planar error of the earthquake risk assessment results Can do. Furthermore, since a building based on an earthquake-resistant design that sufficiently reflects the seismic risk at a specific point can be provided to consumers, it is easy to obtain consensus of a building purchaser at an optimal construction cost.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a computer system for executing the earthquake risk evaluation system of the present invention, and FIG. 2 is a flowchart of the earthquake risk evaluation system of the present invention. FIG. 3 is a diagram showing an embodiment of the ground property data of the surface ground stored in the ground property storage means. FIG. 4 is a schematic diagram showing a situation in which earthquake motion is transmitted to the ground surface while being amplified within the ground layer. FIG. 5 is a diagram showing an embodiment of the aggregate data list created by the area segmentation means, and FIG. 6A is a plan view showing an embodiment of the earthquake risk degree map created by the area segmentation means. FIG. 6b is an enlarged plan view of a part of FIG. 6a. FIG. 7 is a flowchart showing an embodiment of the geographic information storage means, and FIG. 8 is a diagram showing the rank display of conversion accuracy and the availability of conversion in the geographic information storage means of FIG. 7b. FIG. 9 is a plan view showing an embodiment in which a specific point as a target is plotted in the earthquake risk degree map and a danger area is displayed in a line.

  As shown in FIG. 1, the computer 1 includes a CPU 11 and a memory 12 that stores necessary information, and a hardware is configured by appropriately connecting a mouse 13, a keyboard 14, a display 15, and the like to the computer 1. Necessary information is input into the computer 1 by typing the keyboard 14 or by inputting via the mouse 13 or the like on the display 15.

  FIG. 2 is a flowchart showing the seismic risk evaluation system 2, in which FIG. 2 a is obtained from the area setting means 21, the ground characteristic storage means 22, the ground amplification factor calculation means 23, and the area classification means 24. Composed. For example, geographic information data for all of Japan is stored in the memory 12 as longitude and latitude information data, and the region setting means 21 inputs the longitude and latitude ranges of the region for which earthquake risk assessment is to be performed. To narrow down the target area. The storage of the geographic information data described above can also be performed by installing, for example, a map map software or the like made up of nationwide or prefecture units composed of longitude and latitude information data in the computer 1.

The ground characteristic data of the surface ground of various parts of Japan (or prefecture units, wards, municipalities, etc.) can be stored in the memory 12 in advance, or stored on a floppy disk or CD. The ground property data can also be read into the computer 1. This ground characteristic data is set for each region as described above. As described above, the means for storing the ground characteristic data in the computer 1 is the ground characteristic storage means 22.

  It is preferable that the above-mentioned ground characteristic storage means 22 is configured to narrow down the target area by the area setting means 21 and simultaneously send ground characteristic data corresponding to the target area to the ground amplification factor calculation means 23 in conjunction with the area setting means 21. . In addition, an arbitrary ground characteristic data file is created simultaneously with narrowing down the target area, and when moving to the ground gain calculation means 23, the ground characteristic data of a desired specific point can be selected from the ground characteristic data file. FIG. 3 shows an embodiment of ground characteristic data of the surface ground for each mesh displayed by inputting geographical information data, narrowing down the target area, and setting the number of mesh divisions in the target area. Show. Note that the ground characteristic data shown in FIG. 3 corresponds to the case where the calculation method in the ground amplification factor calculation means 23 described later is the Matsuoka or Yodogawa type.

  Fig. 4 shows that the seismic wave 5 (S wave, etc.) generated from an arbitrary seismic source propagates in the engineering base 4 and propagates upward in the surface ground 3 (multi-layer structure) in a specific area toward the ground. The amplification shows that the magnitude of the earthquake is amplified and the seismic wave 6 is formed. Actually, when the seismic wave 5 including a plurality of periodic components passes through the formation having a specific natural period, the seismic wave component that coincides with the natural period is amplified by a resonance phenomenon. Ground amplification is excited. A building erected on the ground surface has a unique natural period for each building, and when the natural period and the dominant periodic component of the amplified seismic wave 6 match, the building will vibrate greatly. . Therefore, even if they are the same seismic wave, the degree of amplification varies greatly depending on the ground characteristics, and the degree of vibration for the same seismic wave varies greatly for each natural period of the building.

  The ground amplification factor calculation means 23 includes various amplification factor calculation methods as described below, and can be configured such that an arbitrary calculation method can be selected on the display 15, or an arbitrary calculation method in advance. It is also possible to adopt a configuration in which only this is included.

  As a method for calculating the ground amplification factor, there is a calculation method described in Ministry of Construction Notification No. 1457-7. One is to replace the ground property data with the equivalent single layer ground based on the ground property data such as layer thickness and shear wave velocity of each layer included in the surface ground composed of multi-layered ground, thereby reducing the nonlinearity of the ground. It is a method of calculating the amplification factor in the ground by performing convergence calculation while considering. The other is a method of roughly classifying the surface ground into first-class ground, second-class ground, and third-class ground, and giving the amplification factor in the ground by a simple formula for each type of ground. For example, the following formula can be given as a formula for the second type ground.

  Here, Gs represents the amplification factor in the ground, and T represents the natural period of the ground.

  By calculating the acceleration response spectrum obtained by multiplying the response spectrum in the engineering base by the amplification factor for each natural period band, the response vibration of the building is identified according to which period band the natural period of the building is in. It becomes possible.

As another method of calculating the amplification factor in the ground, there are calculation formulas by Matsuoka and Yodogawa (reference: Masashi Matsuoka and Saburo Yodogawa (1994), National Land Numerical Information and Seismic Microzoning, The 22nd Ground Vibration Symposium, The Architectural Institute of Japan, Masashi Matsuoka and Saburoh Midorikawa (1994), GIS-BASED
SEISMIC HAZARD MAPPING USING THE DIGITAL LAND INFORMATION, 9th Japan Earthquake Engineering Symposium, 1994, etc.).

  According to Matsuoka and Yodogawa, the average S-wave velocity can be calculated for each fine landform using Equation 2 when evaluating the amplification factor of the surface layer.

  Here, AVS is the estimated average S wave velocity (m / sec) from the ground surface to 30m underground, a, b, c, σ are the coefficients from Table 1, H is the altitude (m), D is the distance from the main river (M).

  By the way, the coefficient b related to the altitude data and the coefficient c related to the shortest distance to the main river in each micro-terrain classification are based on a function determined based on the actually measured value data. Exists. Therefore, Matsuoka and Minatogawa determine the range of altitude and the range of the shortest distance to the main river. For the altitude values outside the range, use the lower and upper limit values as shown in Table 2, and use the minimum distance from the main river. For the range, lower and upper limit values as shown in Table 3 are used.

  Matsuoka and Yodogawa have proposed to calculate the speed amplification of the surface ground based on the Tertiary or earlier hilly land (AVS mentioned above is about 600 m / sec) using Equation 3.

  Here, ARV is a speed amplification degree (internal amplification factor) from the ground surface to 30 m underground. Since Equation 3 is based on an average S wave velocity of 600 (m / sec), when evaluating the S wave velocity on an engineering basis with 400 (m / sec) equivalent, it is calculated by Equation 3. The value obtained by dividing the speed amplification factor by 1.31 is used as the ground amplification factor.

  For example, after calculating the amplification factor in the target ground based on the above-described ground amplification factor calculation formula, a total data list is created based on the amplification factor. FIG. 5 shows an embodiment of the total data list. An earthquake risk degree map in which the target areas are classified for each amplification factor based on the total data list is created (area classification means). FIG. 6a shows an earthquake risk degree map 7a when, for example, the entire area of Aichi Prefecture is designated by the area setting means, and by further narrowing down the target area, a more detailed earthquake in the target area as shown in FIG. 6b is shown. A risk map 7 b is displayed on the display 15.

  If it is possible to identify a specific point where the seismic risk assessment result is desired on the map by checking FIG. 6b, the seismic risk assessment system 2A can be terminated at this stage.

  On the other hand, when the earthquake risk assessment system 2A cannot identify a specific point, or when it is desired to further evaluate the earthquake risk after plotting the specific point on the earthquake risk map in detail, as shown in FIG. 2b. According to the seismic risk evaluation system 2B, which includes the seismic risk display means 26 that takes in the geographical information of the specific point from the geographical information storage means 25 and plots it on the seismic risk map after the area classification means 24. Shall.

  The geographic information storage means 25 is shown in the flowchart of FIG. 7a, and is executed using, for example, known conversion software. For example, by inputting data 251 in the register such as “OO prefecture XX city △△ town 5-3 chome”, the address 251 is converted into longitude and latitude information data 252 corresponding to the address, Geographic information data storage 253 is performed. Here, when the longitude and latitude information data of a specific point are already known, the storage of the geographic information data can be completed by directly inputting the longitude and latitude information data without performing the conversion operation.

  On the other hand, in the conversion work of the address information data, when the conversion is not performed up to a predetermined accuracy, it is possible to store the geographic information data after performing the data conversion again up to the conversion accuracy set in advance, A flowchart in that case is shown in FIG. That is, the conversion 252 to longitude and latitude information data is performed, and if the conversion to the predetermined accuracy set in advance is completed, the storage 253 of the geographic information data is completed, but if the conversion to the predetermined accuracy cannot be performed, the data conversion The storage 253 of the geographic information data is completed through the redoing 254. Here, the conversion level is rank 1 when it can be converted only in a wide range of prefecture levels, and in the following order, it is rank 2 when it can be converted up to the municipal level, rank 3 as the town level, and the level at Ding Rank 4 can be classified as rank 6 when the block level can be converted to rank 5 and address number level. As for the rank accuracy, it is preferable to set longitude and latitude information data accuracy that can identify a specific point in the target area. There are various specific points depending on the location, for example, when it can be specified up to rank 4 (diction level) or when accuracy up to rank 6 (address level) is required. Therefore, it is necessary to set the rank accuracy at the time of conversion required for each target area. FIG. 8 is a diagram showing a rank display of conversion accuracy displayed on the display 15 during conversion, whether conversion is possible, and the like. FIG. 8 shows a case where data conversion is performed at once for a plurality of specific points, and shows a case where conversion is set to be possible when the conversion accuracy is 4 or more. Here, in the case where the conversion accuracy becomes 3 and conversion is impossible, the longitude and latitude information data is input by direct manual input or the like (data conversion redo 254).

  The geographic information data of the specific point stored in the geographic information storage means 25 is taken out and plotted on the earthquake risk degree map (earthquake risk degree display means 26). FIG. 9 shows a case where, for example, three points (X point, Y point, Z point) of geographic information data are stored in the geographic information storage means 25 and the positions of the three points are plotted on the earthquake risk map. ing. In FIG. 9, the point X is included in an area with a high earthquake risk with a ground amplification factor of 2.0 or more, and the point Z is an earthquake risk with a ground amplification factor of 1.0 to 1.5. Although it is included in a low area, the Y point is included in the range of 1.0 to 1.5 in the ground, but the ground gain is 1.5 to 2.0 to 2.0. It shows that it is close to an area with high earthquake risk of ~ 2.5. In general, it is possible to determine that an area with an amplification factor of 2.0 or more in the ground is a high earthquake risk area.

  Therefore, the area in the buffer zone very close to the area with high earthquake risk is included in the area with high earthquake risk, although it is included in the area with low earthquake risk on the earthquake risk map as point Y above. It is preferable to judge it as an area. This is because the surface layer ground characteristics stored in the ground characteristic storage means 22 are likely to have a planar error, and it is necessary to consider such errors. Therefore, a ground amplification factor of 2.0 is set as a danger reference value, an area exceeding this danger reference value is set as a dangerous area, and a range having a certain area around the dangerous area is set as a dangerous area. . For example, as shown in FIG. 9, when the displayed seismic risk map is displayed separated by a mesh of a predetermined width, it can be dangerous by adding two meshes outside it to the mesh range indicating the dangerous area. By displaying the added 2-mesh outline as a region with a thick line, it is possible to easily determine the positional relationship between the specific point and the dangerous region. In FIG. 9, the point Y is also included in the dangerous area (dangerous area), and is determined as a construction point of a building having the required seismic performance.

  Based on the seismic risk evaluation system 2 as described above, after the earthquake risk at a specific point is recognized, an earthquake-resistant design of a building constructed at the specific point is performed. In such seismic design, representative earthquake waveforms set by various organizations or published in various design guidelines, etc. can be used, and the ground amplification factor calculated by the earthquake risk assessment system 2 is also taken into consideration. Seismic design for buildings of the desired scale. Here, the seismic design is carried out over a plurality of structural forms, so that a building having a plurality of structural forms having a desired seismic performance is designed. As such a structural form, a wall-type rigid structure building, a flexible structure building having a column structure including a seismic isolation device, a vibration control device, and the like can be considered. The house maker designs the building of such various structural forms, and the building purchaser purchases the building of the desired structural form and the desired design from the multiple structural forms of the building. Is possible. Depending on the scale of the seismic wave and the amplification factor in the ground, it is possible to immediately provide multiple buildings to customers who want to build or purchase buildings in specific areas or points. It is preferable to design a building having a plurality of structural types in advance.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

The block diagram of a computer system. (A) is a flowchart figure of one Embodiment of the earthquake risk evaluation system of this invention performed with the computer of FIG. (B) is a flowchart of another embodiment of the seismic risk evaluation system of the present invention executed by the computer of FIG. The figure which showed one Embodiment of the ground characteristic data of the surface layer ground memorize | stored in a ground characteristic memory | storage means. The schematic diagram which showed the situation where the ground motion amplified the ground. The figure which showed one Embodiment of the total data list produced by the area division means. The top view which showed one Embodiment of the earthquake risk map created by the area division means. The top view to which Fig.6 (a) was expanded. (A) is a flowchart figure which shows one Embodiment of a physical information storage means. (B) is a flowchart showing one embodiment of the physical information storage means. The figure which showed the rank display of conversion accuracy, and the possibility of conversion in other embodiment of a geographic information storage means. The top view which showed embodiment which displayed the danger possible area | region in the earthquake risk map in the line.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Computer, 2A, 2B ... Earthquake risk assessment system, 3 ... Surface ground, 4 ... Engineering foundation, 5 ... S wave, 6 ... Amplified S wave, 7a, 7b ... Earthquake risk map, 8 DESCRIPTION OF SYMBOLS ... Line indicating danger area, 21 ... Area setting means, 22 ... Ground characteristic storage means, 23 ... Ground amplification factor calculation means, 24 ... Area classification means, 25 ... Geographic information storage means, 26 ... Earthquake risk display means

Claims (5)

An earthquake risk evaluation system for calculating an earthquake risk based on surface layer characteristics of an arbitrary area and evaluating an earthquake risk at a specific point in the arbitrary area,
An area setting means for setting an arbitrary area for the seismic risk assessment, a ground characteristic storage means for storing surface layer characteristics for each area, and a ground amplification factor in the arbitrary area is calculated based on the ground characteristic storage means. Characterized in that it comprises a ground amplification factor calculation means, and a regional classification means for creating a seismic risk map by dividing the arbitrary area for each ground amplification factor calculated by the ground amplification factor calculation means, Risk assessment system. An earthquake risk evaluation system for calculating an earthquake risk based on surface layer characteristics of an arbitrary area and evaluating an earthquake risk at a specific point in the arbitrary area,
An area setting means for setting an arbitrary area for the seismic risk assessment, a ground characteristic storage means for storing surface layer characteristics for each area, and a ground amplification factor in the arbitrary area is calculated based on the ground characteristic storage means. A ground amplification factor calculation means, a regional classification means for creating an earthquake risk map by dividing the arbitrary area for each ground amplification factor calculated by the ground amplification ratio calculation means, and for each specific point in the arbitrary area Geographic information storage means storing geographical information data consisting of longitude and latitude data, and an earthquake risk display means for plotting the specific point extracted from the geographical information storage means on the earthquake risk map. A seismic risk evaluation system that is characteristic. In the earthquake risk evaluation system according to claim 2,
The geographical information storage means is means for storing geographical information data created by converting the input address information data into longitude and latitude information data, and the converted geographical information data indicates the specific point. The storage of the geographic information data is completed when converted to an identifiable accuracy, and the converted geographic information data is converted to an identifiable accuracy when the converted geographic information data is not converted to an identifiable accuracy. An earthquake risk assessment system characterized by the completion of data storage.   A dangerous area composed of a ground amplification factor exceeding a dangerous reference value and a constant area around the dangerous area are configured, and the dangerous area is displayed on the earthquake risk map, The earthquake risk evaluation system according to any one of claims 1 to 3.   Based on the seismic risk evaluation system according to any one of claims 1 to 4, the seismic risk at the specific point is evaluated, and the building has a plurality of structural types having seismic performance according to the seismic risk. An arbitrary building can be selected from the building selecting method.

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