Near fault area judgment and seismic motion selection method and system

Abstract

The invention provides a near fault area judgment and seismic oscillation selection method and system, and relates to the technical field of seismic oscillation selection, and the method comprises the steps: judging that a target site is in a near fault area; generating a target acceleration response spectrum corresponding to the target site; selecting pulse type seismic oscillation records matched with the target acceleration response spectrum to form a primary selection record set; determining a target value of the speed pulse effect intensity; selecting candidate records from the primary record set; amplitude modulation is carried out on the horizontal component and the vertical component of the candidate record, so that the peak acceleration of the horizontal component and the peak acceleration of the vertical component reach the horizontal design peak acceleration and the vertical design peak acceleration respectively, and the peak acceleration and the peak acceleration serve as the finally selected near-fault seismic oscillation acceleration time history. The method is used for solving the technical problem that an existing wave selection method cannot accurately consider the pulse effect and the vertical seismic oscillation effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ground motion selection, in particular to a near-fault region determination and ground motion selection method and system. BACKGROUND

[0002] Currently, the design ground motion is generally synthesized by the seismic site acceleration response spectrum or selected and adjusted from the measured ground motion records with similar seismic site parameters. For the synthesized ground motion, the selection of the response spectrum model and the synthesis method is subjective, and the true ground motion characteristics cannot be fully reflected. For the selected actual ground motion, the ground motion record with similar seismic site parameters to the actual site needs to be selected from the measured ground motion record library. Since the near-fault ground motion often has a velocity pulse effect, the pulse-type ground motion should be selected as the near-fault ground motion. However, the pulse-type ground motion is concentrated within 10 km from the fault, and the seismic stations in this area are easily damaged or even buried, so there are few near-fault pulse-type ground motion records at present. Therefore, the existing wave selection method cannot achieve scientific selection while accurately considering the pulse effect and vertical ground motion effect. SUMMARY

[0003] The purpose of the present application is to provide a near-fault ground motion selection method, system, device and readable storage medium to improve the above problems. In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0004] In a first aspect, the present application provides a near-fault region determination method, comprising:

[0005] obtaining the seismic environment parameters and site conditions of a target site;

[0006] calculating the relative fault distance of the target site according to the seismic environment parameters;

[0007] obtaining the site shear wave velocity in the site conditions, and determining the corresponding near-fault region critical relative fault distance based on the site shear wave velocity;

[0008] comparing the relative fault distance and the critical relative fault distance:

[0009] if the relative fault distance is less than or equal to the critical relative fault distance, it is determined that the target site is in the near-fault region.

[0010] In a second aspect, the present application also provides a near-fault ground motion selection method, comprising:

[0011] using the near-fault region determination method to determine that the target site is in the near-fault region;

[0012] generating a target acceleration response spectrum corresponding to the target site according to the seismic environment parameters and site conditions;

[0013] From the ground motion database, select the pulse type ground motion record matched with the target acceleration response spectrum to form the initial record set;

[0014] Based on the seismic environment parameters and site conditions, determine the target value of the velocity pulse effect intensity; from the initial record set, select the pulse type ground motion record with the closest measured velocity pulse effect intensity to the target value as the candidate record;

[0015] The horizontal component and vertical component of the candidate record are amplitude modulated so that the peak acceleration of the horizontal component and the peak acceleration of the vertical component reach the horizontal design peak acceleration and the vertical design peak acceleration, respectively;

[0016] The amplitude-modulated horizontal component and vertical component are used as the final selected near-fault ground motion acceleration time history.

[0017] In a third aspect, the application also provides a near-fault region determination system, comprising:

[0018] A seismic environment acquisition module is configured to acquire seismic environment parameters and site conditions of a target site;

[0019] A relative fault distance calculation module is configured to calculate the relative fault distance of the target site based on the seismic environment parameters;

[0020] A critical distance determination module is configured to acquire the site shear wave velocity in the site conditions and determine the corresponding near-fault region critical relative fault distance based on the site shear wave velocity;

[0021] A region determination module is configured to compare the relative fault distance and the critical relative fault distance, and if the relative fault distance is less than or equal to the critical relative fault distance, determine that the target site is in the near-fault region.

[0022] In a fourth aspect, the application also provides a near-fault ground motion selection system, comprising:

[0023] A near-fault determination module is configured to determine that the target site is in the near-fault region using the near-fault region determination system;

[0024] A response spectrum generation module is configured to generate a target acceleration response spectrum corresponding to the target site based on the seismic environment parameters and site conditions;

[0025] An initial record set selection module is configured to select pulse type ground motion records matched with the target acceleration response spectrum from the ground motion database to form the initial record set;

[0026] The candidate record selection module is used for determining a target value of the velocity pulse effect intensity based on the seismic environment parameters and the site conditions, and selecting a pulse-type ground motion record with the measured velocity pulse effect intensity closest to the target value from the preliminary record set as the candidate record;

[0027] The ground motion amplitude modulation module is used for modulating the horizontal component and the vertical component of the candidate record, so that the peak acceleration of the horizontal component and the peak acceleration of the vertical component respectively reach the horizontal design peak acceleration and the vertical design peak acceleration.

[0028] The acceleration time history output module is used for outputting the modulated horizontal component and vertical component as the final selected near-fault ground motion acceleration time history.

[0029] The present application has the following beneficial effects:

[0030] The present application provides a set of quantitative determination and selection method, solves the core problem of near-fault region definition ambiguity and pulse-type ground motion selection difficulty. The quantitative determination method based on relative fault distance proposed by the present application overcomes the limitations of traditional empirical distance threshold, and realizes the scientific definition of near-fault region. Secondly, the velocity pulse and vertical effect decay model considering multiple parameters established by the present application provides a reliable basis for the quantification of seismic effect.

[0031] The present application combines target response spectrum matching and effect quantification screening, can efficiently and objectively select the ground motion time history representing pulse intensity and vertical effect, and significantly improves the reliability and efficiency of near-fault engineering seismic design.

[0032] Other features and advantages of the present application will be described in the following specification, and some of them will become apparent from the specification, or will be understood by those skilled in the art from the specification. The purpose and other advantages of the present application can be achieved and obtained by the structure specifically pointed out in the written specification, claims, and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained from these drawings without creative labor.

[0034] Figure 1 The flow chart of the determination method of the near-fault region described in the embodiments of the present application;

[0035] Figure 2 The flow chart of the near-fault ground motion selection method described in the embodiments of the present applicationFigure 1 ;

[0036] Figure 3 The near-fault ground motion selection method flowchart described in the embodiment of the present application Figure 2 ;

[0037] Figure 4 The near-fault region determination system schematic diagram described in the embodiment of the present application

[0038] Figure 5 The near-fault ground motion selection system structure schematic diagram described in the embodiment of the present application

[0039] Figure 6 The near-fault ground motion selection device structure schematic diagram described in the embodiment of the present application

[0040] Markings in the figure:

[0041] 800, near-fault ground motion selection device; 801, processor; 802, memory; 803, multimedia component; 804, I / O interface; 805, communication component. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0043] It should be noted that: similar labels and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0044] Embodiment 1:

[0045] The present embodiment provides a near-fault region determination method.

[0046] Referring to Figure 1 , the present method is shown in the figure:

[0047] S01. Obtain the seismic environmental parameters and site conditions of a target site;

[0048] Specifically, the seismic environmental parameters include the moment magnitude of a potential seismic source , fault distance , and focal depth ; wherein the fault distance is the shortest distance from the target site to the fault plane of the seismic source, and in the present embodiment, the distance from the target observation point to the projection point on the ground surface of the top end of the fault plane is taken as the fault distance .

[0049] Based on the above embodiment, the method further comprises:

[0050] S02. According to the seismic environmental parameters, the relative fault distance of the target site is calculated, which is a dimensionless parameter, and the calculation formula is:

[0051] ; (1)

[0052] In the formula, D represents the relative fault distance.

[0053] In the present embodiment, the relative fault distance D eliminates the influence of different seismic rupture initiation depths, so that the relative influence distances of different seismic events on the site are comparable. Based on the above embodiment, the method further comprises:

[0054] S03. Obtain the site shear wave velocity in the site conditions, and determine the corresponding near-fault region critical relative fault distance Dc based on the site shear wave velocity, wherein the critical relative fault distance Dc is used to determine the boundary of the near-fault region and is determined based on statistical regression analysis of a large number of historical ground motion records;

[0055] Specifically, the following steps are included: S031. Analyze the attenuation law of the normalized parameter of the peak acceleration data with respect to the relative fault distance D, and form a piecewise function:

[0056]

[0057] ; (2) In the formula, D represents the relative fault distance, and Dc represents the critical relative fault distance.

[0058]

[0059] In the formula, D represents the relative fault distance, and Dc represents the critical relative fault distance. ​​​​​​​​When the parameters stabilize, it is a non-fault region.

[0060] S032. Based on the peak ground acceleration data of 188 sets of real near-fault ground motion records, k1, k2, k3 and k4 were fitted to obtain k1, k2, k3 and k4 for different site categories. As shown in Table 1, the site category is defined by the site shear wave velocity. To represent:

[0061] Table 1

[0062]

[0063] In this embodiment, based on the target site By referring to Table 1, the corresponding critical relative fault distance can be directly determined. .

[0064] Based on the above embodiments, this method further includes:

[0065] S04. Compare the stated relative fault distance with the critical relative fault distance:

[0066] If the relative fault distance is less than or equal to the critical relative fault distance, then the target site is determined to be in a near-fault region. Specifically:

[0067] when If the target site is located near a fault zone, then proceed with the next steps; when If the area is not near a fault, the process can be terminated or a conventional wave selection method can be used.

[0068] In this embodiment, dynamic critical values ​​are determined based on measured data statistics, making the determination of near-fault areas more scientific and accurate, and adjusting according to magnitude, focal depth and site conditions.

[0069] Example 2:

[0070] See Figure 2 , Figure 3 Based on the above embodiments, this embodiment provides a method for selecting near-fault ground motion, the method comprising:

[0071] S11. Based on the earthquake environmental parameters and site conditions, generate the target acceleration response spectrum corresponding to the target site. The target acceleration response spectrum is used as the basis for matching and screening records from the seismic motion database.

[0072] Specifically, step S11 includes:

[0073] S111. Obtain the magnitude and fault distance from the earthquake environmental parameters, and calculate the earthquake intensity of the target site based on the magnitude and fault distance using the earthquake intensity attenuation relationship:

[0074] (3)

[0075] In the formula, denotes the target site seismic intensity, is the surface wave magnitude, denotes the fault distance;

[0076] wherein the is calculated by The specific calculation formula is as follows:

[0077] (4)

[0078] S112. The corresponding design basic seismic acceleration A is determined from the target site seismic intensity;

[0079] Specifically, according to the national standard "Code for Seismic Design of Buildings", there is a corresponding relationship between seismic intensity and design basic seismic acceleration, as shown in Table 2:

[0080] Table 2

[0081]

[0082] According to the calculated seismic intensity , the corresponding design basic seismic acceleration A can be obtained from Table 2.

[0083] S113. According to the design seismic grouping of the target site and the site condition, the site characteristic period is determined, which reflects the seismic ground motion spectrum characteristics and site filtering effect;

[0084] Specifically, the design seismic grouping can be obtained by querying the "China Seismic Parameter Zoning Map" according to the geographical location of the target site, and the design seismic grouping is divided into the first group, the second group and the third group.

[0085] According to the corresponding relationship between the site category and the shear wave velocity in the prior art, the site shear wave velocity in the site condition is converted into the site category, and the specific corresponding relationship is shown in Table 3:

[0086] Table 3

[0087]

[0088] According to the determined design seismic grouping and the standard site category, the site characteristic period can be obtained by querying the "Code for Seismic Design of Buildings".

[0089] S114. Generating the target acceleration response spectrum according to the Code for Seismic Design of Buildings based on the design basic seismic acceleration, the site characteristic period and the site condition.

[0090] Based on the above embodiments, the method further comprises:

[0091] S12. Selecting pulse-type ground motion records matching the target acceleration response spectrum from a ground motion database to form a preliminary record set;

[0092] Preferably, the least square method is used to automatically match pulse-type ground motion records in the ground motion database to form the preliminary record set.

[0093] Based on the above embodiments, the method further comprises:

[0094] S13. Determining a target value of the velocity pulse effect intensity based on the seismic environmental parameters and the site condition; and selecting a pulse-type ground motion record with a measured velocity pulse effect intensity closest to the target value from the preliminary record set as a candidate record.

[0095] Specifically, the step S13 comprises:

[0096] S131. Obtaining the site shear wave velocity in the site condition, and determining a corresponding velocity pulse effect attenuation model according to the magnitude and the site shear wave velocity;

[0097] Specifically, the velocity pulse effect intensity is represented by the ratio of the peak ground velocity to the peak ground acceleration (PGV / PGA) to represent the velocity pulse effect. Through regression analysis of 126 sets of near-fault pulse-type ground motion records, a velocity pulse effect (PGV / PGA) attenuation model is established, as shown in the following formula:

[0098] ; (5)

[0099] In the formula, , is an attenuation coefficient associated with the site shear wave velocity and the magnitude ; represents the fault distance, represents a scale factor, and ;

[0100] In this embodiment, the regression analysis result of the PGV / PGA attenuation relationship based on 126 sets of ground motion data is shown in Table 4:

[0101] Table 4

[0102]

[0103] When the embodiment is applied, according to the earthquake magnitude and the site category, the corresponding , and are determined in the above Table 4, and the corresponding velocity pulse effect attenuation model is established.

[0104] S132. Based on the velocity pulse effect attenuation model and the fault distance, a predicted value of the velocity pulse effect intensity is calculated;

[0105] Specifically, the fault distance is substituted into the velocity pulse effect attenuation model to calculate the predicted value of the velocity pulse effect intensity .

[0106] S133. According to the regression standard deviation of the velocity pulse effect attenuation model and the predicted value, a prediction band upper limit value is calculated, and the prediction band upper limit value is taken as the target value of the velocity pulse effect intensity;

[0107] Specifically, according to the earthquake magnitude and the site category, the regression standard deviation is obtained from Table 4, and the prediction band upper limit value with a confidence level of 95% is calculated according to the regression standard deviation and the predicted value .

[0108] ; (6)

[0109] In the formula, represents the 95% prediction band upper limit, represents the sample number, represents the regression standard deviation.

[0110] S134. The measured velocity pulse effect intensity of each pulse record in the preliminary selection record set is calculated, and the record closest to the target value is selected as the final candidate record.

[0111] Based on the above embodiment, the method further includes:

[0112] S14. The horizontal component and the vertical component of the candidate record are amplitude-modulated so that the peak acceleration of the horizontal component and the peak acceleration of the vertical component respectively reach the horizontal design peak acceleration and the vertical design peak acceleration;

[0113] Specifically, the step S14 includes:

[0114] S141. The horizontal design peak acceleration A in the seismic code is obtained, and the horizontal component is amplitude-modulated according to the horizontal design peak acceleration;

[0115] Specifically, the horizontal design peak acceleration A is used to linearly scale the horizontal component, so that the peak acceleration of the horizontal component is equal to the horizontal design peak acceleration.

[0116] S142. Based on the seismic environmental parameters and site conditions of the target site, a target ratio of vertical to horizontal peak acceleration is determined.

[0117] Specifically, the step S142 includes:

[0118] S1421. According to the magnitude in the seismic environmental parameters and the site shear wave velocity in the site conditions, a corresponding vertical effect attenuation model is selected.

[0119] Specifically, the vertical effect attenuation model can be defined as the ratio of vertical ground motion intensity to horizontal ground motion intensity, and in the present embodiment, the intensity of the horizontal ground motion is the intensity of the sum of the horizontal two orthogonal component vectors. In the current tunnel seismic design specification, the ground motion acceleration peak (PGA) is usually used to represent the ground motion intensity, so in the present embodiment, the vertical effect is represented by , wherein and represent the vertical peak acceleration and the horizontal peak acceleration, respectively. Based on the regression analysis of 347 sets of near-fault ground motion records, the present embodiment establishes a vertical effect attenuation model consistent with the form of the velocity pulse effect model:

[0120] ; (7)

[0121] In the formula, , is an attenuation coefficient, represents the fault distance, represents the scale factor, and ;

[0122] In the present embodiment, based on the regression analysis results of the attenuation relationship of 347 sets of ground motion data , the regression analysis results are shown in Table 5:

[0123] Table 5

[0124]

[0125] When the present embodiment is applied, according to the earthquake magnitude and the site category, the corresponding , and in the above Table 5 are determined to establish the corresponding vertical effect attenuation model.

[0126] S1422. According to the fault distance in the seismic environmental parameters and the attenuation model, a predicted value of the ratio of vertical to horizontal peak acceleration is calculated :

[0127] ; (8)

[0128] S1423. calculating a prediction band upper limit value as a target value of the vertical-to-horizontal peak acceleration ratio based on the predicted value and a regression standard deviation of the attenuation model

[0129] ; (9)

[0130] wherein, represents the prediction band upper limit value, which is taken as the target value of the vertical-to-horizontal peak acceleration ratio .

[0131] S143. comparing the target value with a minimum ratio in the seismic code, and taking the larger value as the final ratio :

[0132] ; (10)

[0133] In this embodiment, according to the “Code for Seismic Design of Highway Tunnels”, the minimum ratio is , and the larger value of and is taken as the final ratio .

[0134] S144. determining a vertical design peak acceleration based on the horizontal design peak acceleration and the final ratio, and adjusting the amplitude of the vertical component based on the vertical design peak acceleration.

[0135] Specifically, the vertical component is linearly scaled by the vertical design peak acceleration, so that the peak acceleration of the vertical component is equal to the vertical design peak acceleration.

[0136] Based on the above embodiments, the method further comprises:

[0137] S15. taking the adjusted horizontal component and vertical component as the final selected near-fault ground motion acceleration time history;

[0138] Specifically, the horizontal component and the vertical component are aligned by time step and combined into a complete set of three-component ground motion acceleration time history data.

[0139] It should be noted that, as for the system in the above embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments related to the method, and will not be described in detail here.

[0140] Embodiment 3:​

[0141] Referring to Figure 4 According to the method embodiment above, the embodiment also provides a near-fault region determining system, comprising:

[0142] a seismic environment acquisition module, configured to acquire seismic environment parameters and site conditions of a target site;

[0143] a relative fault distance calculation module, configured to calculate a relative fault distance of the target site according to the seismic environment parameters;

[0144] a critical distance determination module, configured to acquire a site shear wave velocity in the site conditions, and determine a corresponding near-fault region critical relative fault distance based on the site shear wave velocity;

[0145] a region determination module, configured to compare the relative fault distance and the critical relative fault distance, and if the relative fault distance is less than or equal to the critical relative fault distance, determine that the target site is in a near-fault region.

[0146] Embodiment 4:

[0147] Referring to Figure 5 According to the method embodiment above, the embodiment also provides a near-fault ground motion selecting system, comprising:

[0148] a near-fault determination module, configured to determine that a target site is in a near-fault region;

[0149] a response spectrum generation module, configured to generate a target acceleration response spectrum corresponding to the target site according to the seismic environment parameters and site conditions;

[0150] a preliminary record set selection module, configured to select pulse-type ground motion records matching the target acceleration response spectrum from a ground motion database to form a preliminary record set;

[0151] a candidate record selection module, configured to determine a target value of velocity pulse effect intensity based on the seismic environment parameters and site conditions, and select a pulse-type ground motion record with a measured velocity pulse effect intensity closest to the target value from the preliminary record set as a candidate record;

[0152] a ground motion amplitude modulation module, configured to modulate a horizontal component and a vertical component of the candidate record, so that a peak acceleration of the horizontal component and a peak acceleration of the vertical component respectively reach a horizontal design peak acceleration and a vertical design peak acceleration;

[0153] an acceleration time history output module, configured to output the modulated horizontal component and vertical component as a final selected near-fault ground motion acceleration time history.

[0154] Based on the above embodiments, the response spectrum generation module comprises:

[0155] An intensity calculation unit is configured to obtain a magnitude and a fault distance in the seismic environmental parameters, and calculate a target site seismic intensity according to the magnitude and the fault distance through a seismic intensity attenuation relationship;

[0156] A design acceleration determination unit is configured to determine a corresponding design basic seismic acceleration from the target site seismic intensity;

[0157] A characteristic period determination unit is configured to determine a site characteristic period according to an anti-seismic requirement of the target site and the site condition;

[0158] A response spectrum generation unit is configured to generate the target acceleration response spectrum based on the design basic seismic acceleration, the site characteristic period and the site condition.

[0159] Based on the above embodiments, the candidate record selection module comprises:

[0160] An attenuation model determination unit is configured to obtain a site shear wave velocity in the site condition, and determine a corresponding velocity pulse effect attenuation model according to the magnitude and the site shear wave velocity;

[0161] A prediction value calculation unit is configured to calculate a prediction value of the velocity pulse effect intensity based on the velocity pulse effect attenuation model and the fault distance;

[0162] A target value determination unit is configured to calculate an upper limit value of a prediction band according to a regression standard deviation of the velocity pulse effect attenuation model and the prediction value, and take the upper limit value of the prediction band as a target value of the velocity pulse effect intensity.

[0163] Based on the above embodiments, the seismic motion amplitude modulation module comprises:

[0164] A horizontal amplitude modulation unit is configured to obtain a horizontal design peak acceleration in an anti-seismic specification, and modulate a horizontal component according to the horizontal design peak acceleration;

[0165] A ratio determination unit is configured to determine a target ratio of a vertical peak acceleration to a horizontal peak acceleration based on the seismic environmental parameters and the site condition of the target site;

[0166] A ratio comparison unit is configured to compare the peak acceleration ratio with a minimum ratio in the anti-seismic specification, and take a larger value as a final ratio;

[0167] A vertical amplitude modulation unit is configured to determine a vertical design peak acceleration according to the horizontal design peak acceleration and the final ratio, and modulate a vertical component according to the vertical design peak acceleration.

[0168] Based on the above embodiments, the ratio determination unit includes:

[0169] The attenuation model selects a sub-unit, which is used to select the corresponding vertical effect attenuation model based on the magnitude in the earthquake environmental parameters and the site shear wave velocity in the site conditions.

[0170] The ratio prediction calculation subunit is used to calculate the predicted value of the ratio of vertical to horizontal peak acceleration based on the fault distance in the earthquake environmental parameters and the attenuation model.

[0171] The target ratio calculation subunit is used to calculate the target ratio of vertical to horizontal peak acceleration based on the predicted value and the regression standard deviation of the attenuation model.

[0172] Example 5:

[0173] Corresponding to the above method embodiments, this embodiment also provides a near-fault ground motion selection device. The near-fault ground motion selection device described below and the near-fault ground motion selection method described above can be referred to in correspondence.

[0174] Figure 6 This is a block diagram illustrating a near-fault ground motion selection device 800 according to an exemplary embodiment. Figure 6 As shown, the near-fault ground motion selection device 800 may include: a processor 801 and a memory 802. The near-fault ground motion selection device 800 may also include one or more of a multimedia component 803, an I / O interface 804, and a communication component 805.

[0175] The processor 801 is configured to control overall operations of the near-fault ground motion selection device 800 to complete all or part of the steps in the near-fault ground motion selection method described above. The memory 802 is configured to store various types of data to support the operations of the near-fault ground motion selection device 800, which can include, for example, instructions for any application or method operating on the near-fault ground motion selection device 800, and application-related data, such as contact data, sent and received messages, pictures, audio, video, and the like. The memory 802 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The multimedia component 803 can include a screen and an audio component. The screen can be, for example, a touch screen, and the audio component is configured to output and / or input audio signals. For example, the audio component can include a microphone configured to receive external audio signals. The received audio signals can be further stored in the memory 802 or transmitted through the communication component 805. The audio component also includes at least one speaker configured to output audio signals. The I / O interface 804 provides an interface between the processor 801 and other interface modules, which can be a keyboard, a mouse, a button, and the like. The buttons can be virtual buttons or physical buttons. The communication component 805 is configured to enable wired or wireless communication between the near-fault ground motion selection device 800 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, near field communication (NFC), 2G, 3G or 4G, or a combination of one or more of them, so the corresponding communication component 805 can include a Wi-Fi module, a Bluetooth module, an NFC module.

[0176] In an example embodiment, the near-fault ground motion selection device 800 can be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic elements for performing the near-fault ground motion selection method described above.

[0177] In another example embodiment, a computer-readable storage medium including program instructions that, when executed by a processor, implement the steps of the near-fault ground motion selection method described above is also provided. For example, the computer-readable storage medium can be the memory 802 described above including program instructions that are executable by the processor 801 of the near-fault ground motion selection device 800 to complete the near-fault ground motion selection method described above.

[0178] Embodiment 6:

[0179] Corresponding to the method embodiments described above, a readable storage medium is also provided in this embodiment, and the readable storage medium described below can be referred to in correspondence with the near-fault ground motion selection method described above.

[0180] A readable storage medium, on which a computer program is stored, the computer program being executable by a processor to implement the steps of the near-fault ground motion selection method of the method embodiments described above.

[0181] The readable storage medium can specifically be a U disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and various readable storage media that can store program codes.

[0182] The above only describes preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0183] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for determining near-fault regions, characterized in that, include: Obtain seismic environmental parameters and site conditions of the target site; Based on the earthquake environmental parameters, the relative fault distance of the target site is calculated. Obtain the site shear wave velocity in the site conditions, and determine the corresponding critical relative fault distance in the near-fault region based on the site shear wave velocity. Compare the relative fault distance with the critical relative fault distance: If the relative fault distance is less than or equal to the critical relative fault distance, then the target site is determined to be in a near-fault region.

2. A method for selecting near-fault ground motion, characterized in that, include: Using the method described in claim 1, it is determined that the target site is located in a near-fault region; Based on the earthquake environmental parameters and site conditions, a target acceleration response spectrum corresponding to the target site is generated; From the seismic motion database, pulse-type seismic motion records that match the acceleration response spectrum of the target are selected to form an initial set of records; Based on the earthquake environmental parameters and site conditions, a target value for the velocity pulse effect intensity is determined; from the preliminary record set, the pulse-type ground motion record whose measured velocity pulse effect intensity is closest to the target value is selected as a candidate record. The horizontal and vertical components of the candidate records are amplitude-modulated so that the peak acceleration of the horizontal component and the peak acceleration of the vertical component reach the design peak acceleration of the horizontal component and the design peak acceleration of the vertical component, respectively. The amplitude-modulated horizontal and vertical components are used as the final selected near-fault ground motion acceleration time history.

3. The method for selecting near-fault ground motion according to claim 2, characterized in that, Based on the aforementioned seismic environmental parameters and site conditions, a target acceleration response spectrum corresponding to the target site is generated, including: Obtain the magnitude and fault distance from the earthquake environmental parameters, and calculate the earthquake intensity of the target site based on the earthquake intensity attenuation relationship using the magnitude and fault distance. The corresponding basic design seismic acceleration is determined from the seismic intensity of the target site; Based on the seismic fortification requirements of the target site and the site conditions, determine the site characteristic period; Based on the design basic seismic acceleration, the site characteristic period, and the site conditions, the target acceleration response spectrum is generated.

4. The method for selecting near-fault ground motion according to claim 2 or 3, characterized in that, Based on the aforementioned seismic environmental parameters and site conditions, the target value for the velocity pulse effect intensity is determined, including: Obtain the site shear wave velocity from the site conditions, and determine the corresponding velocity pulse effect attenuation model based on the magnitude and the site shear wave velocity. Based on the velocity pulse effect attenuation model and the fault distance, the predicted value of the velocity pulse effect intensity is calculated. Based on the regression standard deviation of the velocity impulse effect attenuation model and the predicted value, the upper limit of the predicted band is calculated, and the upper limit of the predicted band is used as the target value of the velocity impulse effect intensity.

5. The method for selecting near-fault ground motion according to claim 2, characterized in that, Amplitude modulation is applied to the horizontal and vertical components of the candidate records to ensure that the peak acceleration of the horizontal component and the peak acceleration of the vertical component reach the design peak acceleration for the horizontal and vertical components, respectively. This includes: Obtain the horizontal design peak acceleration from the seismic design code, and adjust the amplitude of the horizontal component according to the horizontal design peak acceleration; Based on the seismic environmental parameters and site conditions of the target site, determine the target ratio of vertical to horizontal peak acceleration; The peak acceleration ratio is compared with the minimum ratio in the seismic design code, and the larger value is taken as the final ratio. The vertical design peak acceleration is determined based on the horizontal design peak acceleration and the final ratio, and the vertical component is amplitude-adjusted based on the vertical design peak acceleration.

6. A system for determining near-fault regions, characterized in that, include: The seismic environment acquisition module is used to acquire seismic environment parameters and site conditions of the target site. The relative fault distance calculation module is used to calculate the relative fault distance of the target site based on the seismic environment parameters. The critical distance determination module is used to obtain the site shear wave velocity in the site conditions and determine the corresponding critical relative fault distance in the near-fault region based on the site shear wave velocity. The region determination module is used to compare the relative fault distance with the critical relative fault distance. If the relative fault distance is less than or equal to the critical relative fault distance, the target site is determined to be in a near-fault region.

7. A near-fault ground motion selection system, characterized in that, include: A near-fault determination module is used to determine, using the method described in claim 1, that the target site is located in a near-fault region. The response spectrum generation module is used to generate the target acceleration response spectrum corresponding to the target site based on the seismic environmental parameters and site conditions. The initial record set selection module is used to select pulse-type ground motion records that match the target acceleration response spectrum from the ground motion database to form an initial record set; The candidate record selection module is used to determine the target value of the velocity pulse effect intensity based on the seismic environmental parameters and site conditions; and to select the pulse-type ground motion record whose measured velocity pulse effect intensity is closest to the target value from the preliminary record set as a candidate record. The ground motion amplitude modulation module is used to modulate the horizontal and vertical components of the candidate records so that the peak acceleration of the horizontal component and the peak acceleration of the vertical component reach the design peak acceleration of the horizontal component and the design peak acceleration of the vertical component, respectively. The acceleration time history output module is used to take the amplitude-modulated horizontal and vertical components as the final selected near-fault ground motion acceleration time history.

8. The near-fault ground motion selection system according to claim 7, characterized in that, The reaction spectrum generation module includes: The intensity calculation unit is used to obtain the magnitude and fault distance in the earthquake environmental parameters, and calculate the earthquake intensity of the target site based on the magnitude and fault distance through the earthquake intensity attenuation relationship. The design acceleration determination unit is used to determine the corresponding basic design seismic acceleration based on the seismic intensity of the target site. The characteristic period determination unit is used to determine the site characteristic period based on the seismic fortification requirements of the target site and the site conditions. The response spectrum generation unit is used to generate the target acceleration response spectrum based on the design basic seismic acceleration, the site characteristic period, and the site conditions.

9. The near-fault ground motion selection system according to claim 7 or 8, characterized in that, The candidate record selection module includes: The attenuation model determination unit is used to obtain the site shear wave velocity in the site conditions and determine the corresponding velocity pulse effect attenuation model based on the magnitude and the site shear wave velocity. The prediction calculation unit is used to calculate the predicted value of the velocity pulse effect intensity based on the velocity pulse effect attenuation model and the fault distance. The target value determination unit is used to calculate the upper limit of the prediction band based on the regression standard deviation of the velocity impulse effect attenuation model and the predicted value, and to use the upper limit of the prediction band as the target value of the velocity impulse effect intensity.

10. The near-fault ground motion selection system according to claim 7, characterized in that, The seismic motion amplitude modulation module includes: A horizontal amplitude modulation unit is used to obtain the horizontal design peak acceleration in the seismic code and to adjust the horizontal component according to the horizontal design peak acceleration. The ratio determination unit is used to determine the target ratio of vertical to horizontal peak acceleration based on the seismic environmental parameters and site conditions of the target site. The ratio comparison unit is used to compare the peak acceleration ratio with the minimum ratio in the seismic design code and take the larger value as the final ratio. The vertical amplitude adjustment unit is used to determine the vertical design peak acceleration based on the horizontal design peak acceleration and the final ratio, and to adjust the vertical component amplitude based on the vertical design peak acceleration.

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