Method for analyzing vulnerability of power transmission tower under earthquake-flood sequence disasters and related device

Abstract

The invention belongs to the field of power transmission towers, and discloses a power transmission tower vulnerability analysis method under earthquake-flood sequence disasters and a related device. And the collapse probability of the power transmission tower is obtained through the earthquake-flood sequence type vulnerability function of the power transmission tower. The adopted earthquake-flood sequence type vulnerability function of the power transmission tower not only accurately considers key parameters such as seismic oscillation peak acceleration of seismic waves and flow velocity and depth of flood, but also reasonably considers the irreversible accumulated damage influence caused by earthquakes on the power transmission tower through a refined numerical analysis probability model, so that the power transmission tower can be effectively protected. The dynamic response and accumulated damage effect of the power transmission tower under earthquake and flood sequence type disasters are deeply analyzed, so that the anti-disaster performance of the power transmission tower under a complex disaster environment is reflected more truly, and a scientific basis is provided for disaster prevention and reduction design, reinforcement and reconstruction and emergency response of the power transmission tower.

Description

Technical Field

[0001] The invention belongs to the field of transmission towers, and relates to a method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters and related devices. Background Art

[0002] The distribution of natural resources is significantly uneven. In order to effectively balance power resources and promote balanced economic development in various regions, long-distance transmission channels have become necessary infrastructure. However, these transmission channels traverse a variety of complex geographical environments and often face severe disaster challenges. In particular, in some areas, earthquake activity is frequent and strong, posing a direct threat to transmission facilities. At the same time, other areas are vulnerable to floods, especially in summer, when flood disasters occur frequently, posing another threat to the safe and stable operation of transmission towers.

[0003] Therefore, the safety performance of transmission towers has been put to an unprecedented test under the combined effects of earthquakes and floods. Unfortunately, there is currently a lack of an effective analysis method for the vulnerability of transmission towers under earthquake-flood sequence disasters. In particular, when considering the cumulative damage caused to transmission towers by multiple previous earthquakes, how to accurately assess the impact of this cumulative damage on the vulnerability of transmission towers under subsequent earthquakes and floods has become a key issue that needs to be addressed. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a method and related device for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a method for analyzing the vulnerability of a transmission tower under an earthquake-flood sequence disaster, comprising: obtaining the peak acceleration of the seismic motion of a preceding earthquake wave and the velocity and depth of a subsequent flood; obtaining the collapse probability of the transmission tower through an earthquake-flood sequence vulnerability function of the transmission tower according to the peak acceleration of the seismic motion of the preceding earthquake wave and the velocity and depth of the subsequent flood; wherein the earthquake-flood sequence vulnerability function of the transmission tower is obtained in the following manner: constructing a numerical analysis probability model of the transmission tower; performing interactive earthquake dynamic time history analysis and flood pushover analysis based on the numerical analysis probability model of the transmission tower to obtain an earthquake vulnerability function and a flood vulnerability function, respectively; and obtaining an earthquake-flood sequence vulnerability function of the transmission tower through a full probability analysis method according to the earthquake vulnerability function and the flood vulnerability function.

[0007] Optionally, constructing a numerical analysis probability model of a transmission tower includes: obtaining construction parameter information of the transmission tower and an uncertain distribution model of the construction parameter information; wherein the construction parameter information includes three-dimensional size information, component size information, and material yield strength and ultimate strength information; based on the construction parameter information of the transmission tower and the uncertain distribution model of the construction parameter information, performing a number of samplings using a Latin hypercube sampling method to obtain a number of sampling results; and constructing numerical analysis probability models of a number of transmission towers based on the a number of sampling results.

[0008] Optionally, the interactive earthquake dynamic time-history analysis and flood pushover analysis based on the numerical analysis probability model of the transmission tower, respectively obtaining the earthquake vulnerability function and the flood vulnerability function, include: earthquake dynamic time-history analysis process: gradually increasing the peak acceleration of the seismic motion of the earthquake wave until the transmission tower completely collapses and repeating several times, and obtaining the earthquake vulnerability function by fitting the relationship between the peak acceleration of the seismic motion and the complete collapse of the transmission tower; flood pushover analysis process: in the earthquake dynamic time-history analysis process, before the complete collapse of the transmission tower and before each increment of the peak acceleration of the seismic motion of the earthquake wave, the depth and flow rate of the flood required to cause the complete collapse of the transmission tower are obtained by gradually increasing the flood load, and the flood vulnerability function is obtained by fitting the relationship between the depth and flow rate of the flood and the complete collapse of the transmission tower.

[0009] Optionally, when the depth and flow rate of the flood required to cause the complete collapse of the transmission tower are obtained by gradually increasing the flood load, the flood load is applied in the following manner: simplifying the flood load into a uniformly distributed pressure p flood When the depth of the flood is h, it is applied to all components of the transmission tower from the ground to the height of h and the application direction is the same; the calculation method of the flood load is:

[0010]

[0011] Among them, p flood is the uniform pressure applied to the transmission tower components, ρ w is the flood density, C w is the flood dynamic coefficient, u w The flow rate of the flood.

[0012] Optionally, when gradually increasing the peak acceleration of the seismic wave to cause the complete collapse of the transmission tower and obtaining the depth and velocity of the flood required to cause the complete collapse of the transmission tower by gradually increasing the flood load, the condition for judging the complete collapse of the transmission tower is: the maximum inter-story displacement angle of the transmission tower exceeds 2% or the maximum vertex displacement angle exceeds 1%; the calculation method of the maximum inter-story displacement angle IDR of the transmission tower is:

[0013] IDR=d / H*100%

[0014] Where d is the maximum inter-story displacement of the transmission tower, and H is the overall height of the transmission tower.

[0015] The calculation method of the maximum vertex displacement angle MDR of the transmission tower is:

[0016] MDR=D / H*100%

[0017] Where D is the top displacement of the transmission tower.

[0018] Optionally, the earthquake vulnerability function is:

[0019]

[0020] Among them, P E (PGA) is the probability of collapse of the transmission tower under PGA, PGA is the peak acceleration of the earthquake wave, m PGA is the median PGA value when the transmission tower collapses during earthquake dynamic time history analysis, ζ PGA is the standard deviation of PGA when the transmission tower collapses during earthquake dynamic time history analysis.

[0021] Flood vulnerability function:

[0022]

[0023] Among them, P F (h,u w ) is the transmission tower at depth h and flow velocity u w The probability of collapse under the action of flood, is the flow velocity u when the flood with depth h causes the transmission tower to collapse completely w Median, is the flow velocity u when the flood with depth h causes the transmission tower to collapse completely w Standard deviation.

[0024] The earthquake-flood sequence vulnerability function of the transmission tower is:

[0025] P E-F (h,u w ,PGA)=P E (PGA)+P F (h,u w )-P E (PGA) F (h,u w )

[0026] Among them, P E-F (h,u w ,PGA) is the peak acceleration of the transmission tower in the preceding earthquake wave, PGA, and the subsequent flood velocity u wand the collapse probability at depth h.

[0027] In a second aspect, the present invention provides a transmission tower vulnerability analysis system under earthquake-flood sequence disasters, comprising: a data acquisition module, used to acquire the seismic peak acceleration of the preceding seismic wave and the velocity and depth of the subsequent flood; a calculation module, used to obtain the collapse probability of the transmission tower through the earthquake-flood sequence type vulnerability function of the transmission tower according to the seismic peak acceleration of the preceding seismic wave and the velocity and depth of the subsequent flood; wherein the earthquake-flood sequence type vulnerability function of the transmission tower is obtained by: constructing a numerical analysis probability model of the transmission tower; performing interactive earthquake dynamic time history analysis and flood pushover analysis based on the numerical analysis probability model of the transmission tower to obtain an earthquake vulnerability function and a flood vulnerability function respectively; and obtaining the earthquake-flood sequence type vulnerability function of the transmission tower through a full probability analysis method according to the earthquake vulnerability function and the flood vulnerability function.

[0028] Optionally, the interactive earthquake dynamic time-history analysis and flood pushover analysis based on the numerical analysis probability model of the transmission tower, respectively obtaining the earthquake vulnerability function and the flood vulnerability function, include: earthquake dynamic time-history analysis process: gradually increasing the peak acceleration of the seismic motion of the earthquake wave until the transmission tower completely collapses and repeating several times, and obtaining the earthquake vulnerability function by fitting the relationship between the peak acceleration of the seismic motion and the complete collapse of the transmission tower; flood pushover analysis process: in the earthquake dynamic time-history analysis process, before the complete collapse of the transmission tower and before each increment of the peak acceleration of the seismic motion of the earthquake wave, the depth and flow rate of the flood required to cause the complete collapse of the transmission tower are obtained by gradually increasing the flood load, and the flood vulnerability function is obtained by fitting the relationship between the depth and flow rate of the flood and the complete collapse of the transmission tower.

[0029] According to a third aspect of the present invention, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters when executing the computer program.

[0030] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters are implemented.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The vulnerability analysis method of transmission towers under earthquake-flood sequence disasters of the present invention achieves accurate prediction of the collapse probability of transmission towers under extreme disaster conditions by obtaining the peak acceleration of the seismic wave of the preceding earthquake and the velocity and depth of the subsequent flood, combined with the earthquake-flood sequence vulnerability function of the transmission tower, and provides strong technical support for the safety performance evaluation of transmission towers in earthquake- and flood-prone areas. The earthquake-flood sequence vulnerability function of the transmission tower adopted not only accurately considers the key parameters of the peak acceleration of the seismic wave and the velocity and depth of the flood, but also can reasonably consider the irreversible cumulative damage effect of the earthquake on the transmission tower through a refined numerical analysis probability model, not only considers the impact of a single disaster factor on the transmission tower, but also innovatively integrates the interaction mechanism of earthquake and flood disasters, deeply analyzes the dynamic response and cumulative damage effect of the transmission tower under earthquake and flood sequence disasters, thereby more truly reflecting the disaster resistance performance of the transmission tower under a complex disaster environment, and providing a scientific basis for the disaster prevention and mitigation design, reinforcement and transformation, and emergency response of the transmission tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a flow chart of a method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters according to an embodiment of the present invention.

[0034] Figure 2 A flow chart for constructing an earthquake-flood sequence vulnerability function of a transmission tower according to an embodiment of the present invention.

[0035] Figure 3 Schematic diagram of basic information parameters of a transmission tower according to an embodiment of the present invention.

[0036] Figure 4 Schematic diagram of amplitude modulation of earthquake dynamic time history analysis process according to an embodiment of the present invention.

[0037] Figure 5 Schematic diagram of flood load application in the flood overturn analysis process according to an embodiment of the present invention.

[0038] Figure 6 Schematic diagram of earthquake-flood sequence vulnerability function calculation according to an embodiment of the present invention.

[0039] Figure 7 This is a structural block diagram of a transmission tower vulnerability analysis system under earthquake-flood sequence disasters according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0043] See also Figure 1 In one embodiment of the present invention, a method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters is provided, which can help evaluate the disaster resistance performance of transmission towers under earthquake-flood sequence disasters.

[0044] Specifically, the method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters of the present invention comprises the following steps:

[0045] S1: Obtain the peak acceleration of the preceding seismic wave and the velocity and depth of the subsequent flood;

[0046] S2: According to the peak acceleration of the preceding earthquake wave and the velocity and depth of the subsequent flood, the collapse probability of the transmission tower is obtained through the earthquake-flood sequence vulnerability function of the transmission tower;

[0047] See also Figure 2 , where the earthquake-flood sequence vulnerability function of the transmission tower is obtained by: constructing a numerical analysis probability model of the transmission tower; performing interactive earthquake dynamic time history analysis and flood pushover analysis based on the numerical analysis probability model of the transmission tower to obtain the earthquake vulnerability function and flood vulnerability function respectively; according to the earthquake vulnerability function and the flood vulnerability function, the earthquake-flood sequence vulnerability function of the transmission tower is obtained through the full probability analysis method.

[0048] The vulnerability analysis method of transmission towers under earthquake-flood sequence disasters of the present invention achieves accurate prediction of the collapse probability of transmission towers under extreme disaster conditions by obtaining the peak acceleration of the seismic wave of the preceding earthquake and the velocity and depth of the subsequent flood, combined with the earthquake-flood sequence vulnerability function of the transmission tower, and provides strong technical support for the safety performance evaluation of transmission towers in earthquake- and flood-prone areas. The earthquake-flood sequence vulnerability function of the transmission tower adopted not only accurately considers the key parameters of the peak acceleration of the seismic wave and the velocity and depth of the flood, but also can reasonably consider the irreversible cumulative damage effect of the earthquake on the transmission tower through a refined numerical analysis probability model, not only considers the impact of a single disaster factor on the transmission tower, but also innovatively integrates the interaction mechanism of earthquake and flood disasters, deeply analyzes the dynamic response and cumulative damage effect of the transmission tower under earthquake and flood sequence disasters, thereby more truly reflecting the disaster resistance performance of the transmission tower under a complex disaster environment, and providing a scientific basis for the disaster prevention and mitigation design, reinforcement and transformation, and emergency response of the transmission tower.

[0049] In a possible implementation, the construction of a numerical analysis probability model of a transmission tower includes: obtaining construction parameter information of the transmission tower and an uncertain distribution model of the construction parameter information; wherein the construction parameter information includes three-dimensional size information, component size information, and material yield strength and ultimate strength information; based on the construction parameter information of the transmission tower and the uncertain distribution model of the construction parameter information, a Latin hypercube sampling method is used to perform a number of samplings to obtain a number of sampling results; and a number of numerical analysis probability models of the transmission towers are constructed based on the number of sampling results.

[0050] Explanatory, see Figure 3 The three-dimensional size information includes the height H of the transmission tower, the horizontal width W1 of the transmission tower in the X direction, and the horizontal width W2 of the transmission tower in the Y direction. The component size information includes the width B1 of the main rods around the transmission tower and the width B2 of the oblique supporting rods of the transmission tower. The material yield strength and ultimate strength information is the material yield strength f of the transmission tower steel component y and the ultimate strength of the steel structure of the transmission tower u .

[0051] Exemplarily, the uncertain distribution models of the constructed parameter information are all assumed to obey a normal distribution.

[0052] Explanatory, according to the structural parameter information of the transmission tower and the uncertainty distribution model of the structural parameter information, the Latin hypercube sampling method is used to conduct N samplings, and an analysis model with the corresponding number of samplings is established in OpenSees, that is, the number of numerical analysis probability models of the transmission tower is N. The quantity of N needs to fully consider the uncertainty distribution of the transmission tower parameters, and at the same time, it is necessary to take into account the workload of numerical modeling, analysis time, etc. Generally, it can be taken as 20. Among them, OpenSees is an open system for seismic engineering simulation, which is an open-source program software system for seismic response simulation in the fields of structures and geotechnics, and is used for seismic response simulation and performance-based seismic analysis research in the fields of structures and geotechnics.

[0053] In a possible implementation manner, the seismic dynamic time history analysis and flood pushover analysis performed interactively based on the numerical analysis probability model of the transmission tower respectively obtain the seismic vulnerability function and the flood vulnerability function, including: the process of seismic dynamic time history analysis: gradually increment the peak ground acceleration of the seismic wave until the transmission tower completely collapses and repeat several times, and obtain the seismic vulnerability function by fitting the relationship between the peak ground acceleration and the complete collapse of the transmission tower; the process of flood pushover analysis: during the process of seismic dynamic time history analysis, before the transmission tower completely collapses and before each increment of the peak ground acceleration of the seismic wave, the depth and flow velocity of the flood required to cause the complete collapse of the transmission tower are obtained by gradually increasing the flood load, and the flood vulnerability function is obtained by fitting the relationship between the depth and flow velocity of the flood and the complete collapse of the transmission tower.

[0054] Explanatory, gradually incrementing the peak ground acceleration of the seismic wave until the transmission tower completely collapses and repeating several times can be carried out in parallel during specific implementation to improve efficiency.

[0055] Exemplary, see Figure 4 , the peak ground acceleration of the seismic wave starts from 0.1g for amplitude modulation, and the amplitude modulation step is 0.1g, that is, the peak ground acceleration of the seismic wave is calculated by amplitude modulation from 0.1g, 0.2g, 0.3g,..., Mg, and the amplitude modulation end point of the seismic wave is Mg, where Mg is the peak ground acceleration required for the complete collapse of the transmission tower under this seismic wave.

[0056] Explanatory, during flood pushover analysis, it is only carried out when the transmission tower has not completely collapsed during seismic dynamic time history analysis, that is, when the peak ground acceleration of the seismic wave in the seismic dynamic time history analysis is <Mg, flood pushover analysis needs to be carried out after each amplitude modulation of the seismic wave.

[0057] Exemplary, during flood pushover analysis, the depth h of the flood can be designed as a series of point values, and then the influence of different flood flow velocities on the transmission tower can be analyzed at each depth h of the flood.

[0058] In a possible implementation, when the depth and flow rate of the flood required to cause the complete collapse of the transmission tower are obtained by gradually increasing the flood load, the flood load is applied in the following manner: the flood load is simplified to a uniformly distributed pressure p flood When the depth of the flood is h, it is applied to all components of the transmission tower from the ground to the height of h and the application direction is the same; the calculation method of the flood load is:

[0059]

[0060] Among them, p flood is the uniform pressure applied to the transmission tower components, ρ w (kg / m 3 ) is the flood density, C w is the flood dynamic coefficient, u w (m / s) is the flow velocity of the flood.

[0061] Explanatory, see Figure 5 , simplifying the flood load into uniformly distributed pressure p flood When the depth of the flood is h, it is applied to all components of the transmission tower from the ground to the height of h, and the application direction is along the direction of the water flow, so as to facilitate the analysis.

[0062] For example, the flood density ρ w Assuming uniform distribution U1[1000,1250], flood dynamic coefficient C w Assume normal distribution U2[1.5,3].

[0063] In a possible implementation, when the peak acceleration of the seismic wave is gradually increased to cause the complete collapse of the transmission tower and the depth and velocity of the flood required to cause the complete collapse of the transmission tower are obtained by gradually increasing the flood load, the condition for judging the complete collapse of the transmission tower is that the maximum inter-story displacement angle of the transmission tower exceeds 2% or the maximum vertex displacement angle exceeds 1%.

[0064] Explanatory, when the earthquake dynamic time history analysis does not converge, it can also be judged that the transmission tower has completely collapsed.

[0065] Explanatory, the maximum inter-story displacement angle IDR of the transmission tower is calculated as:

[0066] IDR=d / H*100%

[0067] Where d is the maximum inter-story displacement of the transmission tower, and H is the overall height of the transmission tower.

[0068] The calculation method of the maximum vertex displacement angle MDR of the transmission tower is:

[0069] MDR=D / H*100%

[0070] Where D is the top displacement of the transmission tower.

[0071] Explanatory, when the flood depth is h, the method for determining the flood velocity required for the complete collapse of the transmission tower is to obtain the uniformly distributed pressure p on the transmission tower components when the maximum inter-story displacement angle IDR of the transmission tower exceeds 2% or the maximum vertex displacement angle MDR exceeds 1% through flood pushover analysis. flood , and then the flow rate of the flood is calculated by back-calculating the uniform pressure on the transmission tower components:

[0072]

[0073] In a possible implementation, the seismic vulnerability function is:

[0074]

[0075] Among them, P E (PGA) is the probability of collapse of the transmission tower under PGA, PGA is the peak acceleration of the earthquake wave, m PGA is the median PGA value when the transmission tower collapses during earthquake dynamic time history analysis, ζ PGA is the standard deviation of PGA when the transmission tower collapses during earthquake dynamic time history analysis.

[0076] Exemplarily, the flood vulnerability function is:

[0077]

[0078] Among them, P F (h,u w ) is the transmission tower at depth h and flow velocity u w The probability of collapse under the action of flood, is the flow velocity u when the flood with depth h causes the transmission tower to collapse completely w Median, is the flow velocity u when the flood with depth h causes the transmission tower to collapse completely w Standard deviation.

[0079] Explanatory, since several numerical analysis probability models of transmission towers were designed, and the gradual increase process of the peak acceleration of ground motion was repeated several times in the earthquake dynamic time history analysis, at the same time, the flood overturn analysis process was also designed several times based on the earthquake dynamic time history analysis. On this basis, in order to comprehensively consider various situations and reduce errors, the PGA median m of the transmission tower collapse during the earthquake dynamic time history analysis was introduced PGA and PGA standard deviation ζ when the transmission tower collapses during earthquake dynamic time history analysis PGATo characterize the collapse probability P of the transmission tower under PGA E (PGA), at the same time, the flow velocity u when a flood with a depth of h is introduced to cause the transmission tower to completely collapse w Median and the flow velocity u when the flood with depth h causes the transmission tower to collapse completely w Standard Deviation To characterize the transmission tower at depth h and flow velocity u w The collapse probability P under the flood F (h,u w ), achieving improved prediction accuracy and robustness.

[0080] Based on the earthquake vulnerability function and flood vulnerability function, the earthquake-flood sequence vulnerability function of the transmission tower is obtained through the full probability analysis method:

[0081] P E-F (h,u w ,PGA)=P E (PGA)+P F (h,u w )-P E (PGA) F (h,u w )

[0082] Among them, P E-F (h,u w ,PGA) is the peak acceleration of the transmission tower in the preceding earthquake wave, PGA, and the subsequent flood velocity u w and the collapse probability at depth h.

[0083] See also Figure 6 The calculated earthquake-flood sequence vulnerability function is finally in the form of a vulnerability surface. The collapse probability is related to three parameters: the peak acceleration of the preceding earthquake wave PGA, the flow velocity u of the subsequent flood, and the w and depth h.

[0084] Explanatory, total probability analysis method is an important probability theory tool, which allows the probability of a complex event to be decomposed into the sum of the probabilities of multiple simple events. The core of this method is to use conditional probability and total probability formula to infer the probability of complex events through the known probabilities of simple events.

[0085] By combining the full probability analysis method with the earthquake vulnerability function and the flood vulnerability function, we can comprehensively consider the joint impact of earthquakes and floods on transmission towers, more accurately evaluate the probability of collapse of transmission towers in complex disaster environments, and provide more reliable data support for risk assessment.

[0086] The following are device embodiments of the present invention, which can be used to implement the method embodiments of the present invention. For details not disclosed in the device embodiments, please refer to the method embodiments of the present invention.

[0087] See also Figure 7 In another embodiment of the present invention, a transmission tower vulnerability analysis system under earthquake-flood sequence disasters is provided, which can be used to implement the above-mentioned transmission tower vulnerability analysis method under earthquake-flood sequence disasters. Specifically, the transmission tower vulnerability analysis system under earthquake-flood sequence disasters includes a data acquisition module and a calculation module.

[0088] The data acquisition module is used to obtain the peak acceleration of the seismic motion of the preceding seismic wave and the velocity and depth of the subsequent flood; the calculation module is used to obtain the collapse probability of the transmission tower through the earthquake-flood sequence vulnerability function of the transmission tower according to the peak acceleration of the seismic motion of the preceding seismic wave and the velocity and depth of the subsequent flood. The earthquake-flood sequence vulnerability function of the transmission tower is obtained by the following methods: constructing a numerical analysis probability model of the transmission tower; performing interactive earthquake dynamic time history analysis and flood overturn analysis based on the numerical analysis probability model of the transmission tower to obtain the earthquake vulnerability function and flood vulnerability function respectively; according to the earthquake vulnerability function and the flood vulnerability function, the earthquake-flood sequence vulnerability function of the transmission tower is obtained through the full probability analysis method.

[0089] In a possible implementation, the interactive earthquake dynamic time history analysis and flood pushover analysis based on the numerical analysis probability model of the transmission tower, respectively obtaining the earthquake vulnerability function and the flood vulnerability function, include: earthquake dynamic time history analysis process: gradually increasing the peak acceleration of the seismic motion of the seismic wave until the transmission tower completely collapses and repeating several times, and obtaining the earthquake vulnerability function by fitting the relationship between the peak acceleration of the seismic motion and the complete collapse of the transmission tower; flood pushover analysis process: in the earthquake dynamic time history analysis process, before the complete collapse of the transmission tower and before each increment of the peak acceleration of the seismic motion of the seismic wave, the depth and flow rate of the flood required to cause the complete collapse of the transmission tower are obtained by gradually increasing the flood load, and the flood vulnerability function is obtained by fitting the relationship between the depth and flow rate of the flood and the complete collapse of the transmission tower.

[0090] All relevant contents of each step involved in the embodiment of the aforementioned transmission tower vulnerability analysis method under earthquake-flood sequence disasters can be referred to the functional description of the functional modules corresponding to the transmission tower vulnerability analysis system under earthquake-flood sequence disasters in the embodiment of the present invention, and will not be repeated here.

[0091] The division of modules in the embodiments of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present invention may be integrated into one processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0092] In another embodiment of the present invention, a computer device is provided, the computer device comprising a processor and a memory, the memory being used to store a computer program, the computer program comprising program instructions, and the processor being used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used for the operation of the transmission tower vulnerability analysis method under earthquake-flood sequence disasters.

[0093] In another embodiment of the present invention, the present invention further provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters in the above embodiment.

[0094] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0095] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0096] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0097] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters, characterized in that: include: Obtain the peak acceleration of the preceding seismic wave and the velocity and depth of the subsequent flood; According to the peak acceleration of the preceding earthquake wave and the velocity and depth of the subsequent flood, the collapse probability of the transmission tower is obtained through the earthquake-flood sequence vulnerability function of the transmission tower. Among them, the earthquake-flood sequence vulnerability function of the transmission tower is obtained by the following method: Construct a numerical analysis probabilistic model of transmission towers; Based on the numerical analysis probability model of transmission towers, interactive earthquake dynamic time history analysis and flood pushover analysis are carried out to obtain earthquake vulnerability function and flood vulnerability function respectively; According to the earthquake vulnerability function and flood vulnerability function, the earthquake-flood sequence vulnerability function of the transmission tower is obtained through the full probability analysis method.

2. The method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters according to claim 1 is characterized in that: The numerical analysis probability model for constructing the transmission tower includes: Acquire structural parameter information of the transmission tower and an uncertain distribution model of the structural parameter information; wherein the structural parameter information includes three-dimensional size information, component size information, material yield strength and ultimate strength information; According to the structural parameter information of the transmission tower and the uncertain distribution model of the structural parameter information, a Latin hypercube sampling method is used to perform several samplings to obtain several sampling results; A numerical analysis probability model of several transmission towers is constructed based on several sampling results.

3. The method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters according to claim 1 is characterized in that: The interactive earthquake dynamic time history analysis and flood pushover analysis based on the numerical analysis probability model of the transmission tower, respectively obtaining the earthquake vulnerability function and the flood vulnerability function, include: Earthquake dynamic time history analysis process: gradually increase the peak acceleration of the seismic wave until the transmission tower completely collapses and repeat several times, and obtain the earthquake vulnerability function by fitting the relationship between the peak acceleration of the seismic wave and the complete collapse of the transmission tower; Flood overturn analysis process: In the earthquake dynamic time history analysis process, before the complete collapse of the transmission tower and before each increment of the peak acceleration of the seismic wave, the depth and velocity of the flood required to cause the complete collapse of the transmission tower are obtained by gradually increasing the flood load, and the flood vulnerability function is obtained by fitting the relationship between the depth and velocity of the flood and the complete collapse of the transmission tower.

4. The method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters according to claim 3 is characterized in that: When the depth and flow rate of the flood required to cause the complete collapse of the transmission tower are obtained by gradually increasing the flood load, the flood load is applied in the following manner: Simplify the flood load into uniformly distributed pressure p flood , and when the depth of the flood is h, it is applied to all components of the transmission tower from the ground to the height of h and in the same direction; The calculation method of flood load is: Among them, p flood is the uniform pressure applied to the transmission tower components, ρ w is the flood density, C w is the flood dynamic coefficient, u w The flow rate of the flood.

5. The method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters according to claim 3 is characterized in that: When the peak acceleration of the earthquake wave is gradually increased to cause the complete collapse of the transmission tower and the depth and flow rate of the flood required to cause the complete collapse of the transmission tower are obtained by gradually increasing the flood load, the condition for judging the complete collapse of the transmission tower is: The maximum inter-story displacement angle of the transmission tower exceeds 2% or the maximum vertex displacement angle exceeds 1%; The calculation method of the maximum inter-story displacement angle IDR of the transmission tower is: IDR=d / H*100% Where d is the maximum inter-story displacement of the transmission tower, and H is the overall height of the transmission tower; The calculation method of the maximum vertex displacement angle MDR of the transmission tower is: MDR=D / H*100% Where D is the top displacement of the transmission tower.

6. The method for analyzing the vulnerability of transmission towers under earthquake-flood sequence disasters according to claim 3 is characterized in that: The earthquake vulnerability function is: Among them, P E (PGA) is the probability of collapse of the transmission tower under PGA, PGA is the peak acceleration of the earthquake wave, m PGA is the median PGA value when the transmission tower collapses during earthquake dynamic time history analysis, ζ PGA is the PGA standard deviation when the transmission tower collapses during earthquake dynamic time history analysis; Flood vulnerability function: Among them, P F (h,u w ) is the transmission tower at depth h and flow velocity u w The probability of collapse under the action of flood, is the flow velocity u when the flood with depth h causes the transmission tower to collapse completely w Median, is the flow velocity u when the flood with depth h causes the transmission tower to collapse completely w Standard deviation; The earthquake-flood sequence vulnerability function of the transmission tower is: P E-F (h,u w ,PGA)=P E (PGA)+P F (h,u w )-P E (PGA)·P F (h,u w ) Among them, P E-F (h,u w ,PGA) is the peak acceleration of the transmission tower in the preceding earthquake wave, PGA, and the subsequent flood velocity u w and the collapse probability at depth h.

7. A transmission tower vulnerability analysis system under earthquake-flood sequence disasters, characterized in that: include: A data acquisition module, used to acquire the peak acceleration of the preceding seismic wave and the velocity and depth of the subsequent flood; A calculation module, for obtaining the collapse probability of the transmission tower through an earthquake-flood sequence vulnerability function of the transmission tower according to the peak acceleration of the seismic wave of the preceding seismic wave and the velocity and depth of the subsequent flood; Among them, the earthquake-flood sequence vulnerability function of the transmission tower is obtained by the following method: Construct a numerical analysis probabilistic model of transmission towers; Based on the numerical analysis probability model of transmission towers, interactive earthquake dynamic time history analysis and flood pushover analysis are carried out to obtain earthquake vulnerability function and flood vulnerability function respectively; According to the earthquake vulnerability function and flood vulnerability function, the earthquake-flood sequence vulnerability function of the transmission tower is obtained through the full probability analysis method.

8. The transmission tower vulnerability analysis system under earthquake-flood sequence disaster according to claim 7 is characterized in that: The interactive earthquake dynamic time history analysis and flood pushover analysis based on the numerical analysis probability model of the transmission tower, respectively obtaining the earthquake vulnerability function and the flood vulnerability function, include: Earthquake dynamic time history analysis process: gradually increase the peak acceleration of the seismic wave until the transmission tower completely collapses and repeat several times, and obtain the earthquake vulnerability function by fitting the relationship between the peak acceleration of the seismic wave and the complete collapse of the transmission tower; Flood overturn analysis process: In the earthquake dynamic time history analysis process, before the complete collapse of the transmission tower and before each increment of the peak acceleration of the seismic wave, the depth and velocity of the flood required to cause the complete collapse of the transmission tower are obtained by gradually increasing the flood load, and the flood vulnerability function is obtained by fitting the relationship between the depth and velocity of the flood and the complete collapse of the transmission tower.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for analyzing the vulnerability of a transmission tower under an earthquake-flood sequence disaster as described in any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for analyzing the vulnerability of a transmission tower under an earthquake-flood sequence disaster as claimed in any one of claims 1 to 6 are implemented.

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