Multi-disaster toughness evaluation method for pile foundation structure under extreme wave condition

Abstract

The invention relates to the field of pile foundation toughness evaluation, and discloses a multi-disaster toughness evaluation method for a pile foundation structure under an extreme wave condition, which comprises the following steps of: constructing a multi-disaster scene parameter system through a multi-element coupling analysis method, and constructing a high-precision finite element model in combination with finite element software; the method is used for simulating the response effect of the pile foundation structure under different load combinations, so that a toughness index system is constructed, and the multi-disaster toughness of the pile foundation structure is evaluated. According to the method, multiple factors such as waves, earthquakes and soil parameters are coupled for the first time, multi-disaster toughness evaluation is conducted, the mechanical behaviors of the pile foundation structure under the extreme disaster condition can be reflected more truly, and a more reliable scientific basis is provided for design and construction of the pile foundation structure.

Description

Technical Field

[0001] The invention relates to the field of pile foundation toughness assessment, in particular to a multi-hazard toughness assessment method for a pile foundation structure under extreme wave conditions. Background Art

[0002] 1. With global climate change, the frequent occurrence of extreme wave events such as storm surges, tsunamis and huge waves poses a serious threat to the stability of marine engineering structures, especially pile foundation structures. Traditional design methods often ignore the nonlinear characteristics and multi-hazard coupling effects of extreme waves, resulting in inaccurate evaluation results under extreme conditions and unable to effectively ensure the safety of the structure. The existing evaluation technology lacks comprehensive consideration of the dynamic response and toughness of pile foundation structures under extreme waves, which limits its application value in practical engineering. Therefore, developing a method that can accurately evaluate the multi-hazard resilience of pile foundation structures under extreme wave conditions is of great significance for optimizing structural design, improving disaster resistance, and ensuring the safe operation of marine engineering. The multi-hazard resilience evaluation method of pile foundation structures under extreme wave conditions proposed in the present invention provides a scientific basis for the design and construction of pile foundation structures by constructing a nonlinear model of extreme waves, analyzing multi-hazard coupling effects, evaluating the dynamic response of pile foundation structures, and calculating toughness indicators. The method takes into account multiple factors such as wave force, water flow velocity, and seabed soil properties, and can fully reflect the performance of pile foundation structures under extreme conditions.

[0003] In order to overcome the shortcomings of the prior art, the present invention proposes a multi-hazard resilience assessment method for pile foundation structures under extreme wave conditions. The method comprehensively considers the nonlinear characteristics of extreme waves, the coupling of multiple hazards, and the dynamic response of pile foundation structures, and aims to provide a more scientific and comprehensive assessment method for the design, construction, and maintenance of pile foundation structures. Through the method of the present invention, the weak links of pile foundation structures under extreme wave conditions can be effectively identified, the design parameters can be optimized, and the toughness and disaster resistance of the structure can be improved, thereby ensuring the safe operation and sustainable development of marine engineering. Through this method, the weak links of the structure can be effectively identified, the design optimization can be guided, and the disaster resistance of the structure can be enhanced, thereby reducing the damage caused by extreme events. In addition, the present invention has a positive impact on promoting scientific and technological progress in the field of marine engineering and enhancing my country's competitiveness in the field of international marine engineering. Summary of the invention

[0004] The present invention overcomes the deficiencies of the prior art and provides a multi-hazard resilience assessment method for a pile foundation structure under extreme wave conditions.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A first aspect of the present invention provides a multi-hazard resilience assessment method for a pile foundation structure under extreme wave conditions, comprising the following steps: Conduct multi-factor coupling analysis on different wave parameters, different earthquake parameters and different soil parameters to build a multi-hazard scenario parameter system; Combined with the multi-hazard scenario parameter system, finite element software is used to construct a high-precision finite element model; The response effect of the target pile foundation structure under different load combinations is simulated through a high-precision finite element model, and a toughness index system is constructed based on the response effect to evaluate the multi-hazard resilience of the target pile foundation structure.

[0006] Furthermore, in a preferred embodiment of the present invention, a multi-factor coupling analysis is performed on different wave parameters, different earthquake parameters and different soil parameters to construct a multi-disaster scenario parameter system, specifically: Obtain the pile foundation structure that needs to be evaluated for multi-hazard resilience, mark it as the target pile foundation structure, determine the sea area where the target pile foundation structure is located, mark it as the target sea area, and introduce the historical data network; In the historical data network, extreme values ​​of historical wave parameters and historical wave parameter ranges in the target sea area are retrieved, and extreme values ​​of historical earthquake parameters and historical earthquake parameter ranges of the plate where the target sea area is located are retrieved; Based on the historical wave parameter range of the target sea area and the historical earthquake parameter range of the plate where it is located, a load combination matrix of different historical wave parameters and historical earthquake parameters is established and calibrated as a wave-earthquake parameter load combination matrix; Mark the extreme values ​​of historical wave parameters and historical earthquake parameters in the wave-earthquake parameter load combination matrix to generate extreme wave-earthquake load combinations; Determine soil parameters of the target pile foundation structure, wherein the soil parameters of the target pile foundation structure are load combination parameters of sand and clay of the target pile foundation structure, and retrieve a controllable range of the soil parameters of the target pile foundation structure based on a historical data network; A multi-hazard scenario parameter system is constructed by combining the wave-seismic parameter load combination matrix, extreme wave-seismic load combination, and the controllable range of soil parameters of the target pile foundation structure.

[0007] Furthermore, in a preferred embodiment of the present invention, the multi-disaster scenario parameter system is combined and a high-precision finite element model is constructed using finite element software, specifically: Determine the composition and specifications of the target pile foundation structure, wherein the composition of the target pile foundation structure includes a pile body and a pile end extension area; Introducing finite element software, the finite element software can simulate different response modes of the target pile foundation structure under a multi-hazard scenario parameter system, in which the pile body is set as a shell unit and the pile end extension area is set as a solid unit; The shell element and the solid element are connected by Tie constraints, and the specifications of the target pile foundation structure are imported to obtain the target simulated pile foundation structure; Preset a simulated soil blank structure in the finite element software, create a pile-soil contact surface between the target simulated pile foundation structure and the simulated soil blank structure, and set a standard friction coefficient at the pile-soil contact surface, wherein the standard friction coefficient is obtained by searching the historical data network; Importing soil parameters of the target pile foundation structure into a simulated soil blank structure to obtain a preliminarily set simulated soil structure, dividing a sand layer and a clay layer in the preliminarily set simulated soil structure, and marking the intersection of the sand layer and the clay layer as an intersection boundary; The intersection boundaries include lateral boundaries and bottom boundaries, all intersection boundaries are highlighted, a target simulated soil structure is generated, and a preliminary finite element model is obtained by combining the target simulated pile foundation structure and the target simulated soil structure; The multi-hazard scenario parameter system and the preliminary finite element model are subjected to multi-physics field coupling loading processing to obtain a high-precision finite element model.

[0008] Furthermore, in a preferred embodiment of the present invention, the multi-disaster scenario parameter system and the preliminary finite element model are subjected to multi-physics field coupling loading processing to obtain a high-precision finite element model, specifically: Import the multi-hazard scenario parameter system into the preliminary finite element model, obtain CFD software, simulate the wave field in the preliminary finite element model by combining the multi-hazard scenario parameter system with the CFD software, and output the pressure time history data in real time in the preliminary finite element model; Wherein, the pressure time history data is the pressure data on the pile foundation structure caused by the wave impacting the pile foundation structure. Based on the pressure time history data, the pressure field is simulated in the preliminary finite element model, and the pressure field is mapped on the surface of the preliminary finite element model to obtain the pressure field mapping preliminary finite element model; Based on the multi-hazard scenario parameter system in the preliminary finite element model of pressure field mapping, the historical earthquake parameter range is converted into equivalent nodal force, and the equivalent nodal force is applied to the intersection boundary of the preliminary finite element model of pressure field mapping to obtain the preliminary finite element model to be trained; A standard training time step is set in the preliminary finite element model to be trained, and automatic iterative convergence training is performed. When the training time step is greater than the standard training time step, the automatic iterative convergence training is stopped, and a high-precision finite element model is output.

[0009] Furthermore, in a preferred embodiment of the present invention, the response effect of the target pile foundation structure under different load combinations is simulated by a high-precision finite element model, and a toughness index system is constructed based on the response effect to evaluate the multi-hazard toughness of the target pile foundation structure, specifically: In the high-precision finite element model, different wave-seismic load combinations are constructed based on the multi-hazard scenario parameter system, in which the corresponding wave parameters and seismic parameters are recorded in the wave-seismic load combination; Apply different wave-seismic load combinations to the high-precision finite element model, and derive the pressure time history data and soil strain parameters corresponding to different wave-seismic load combinations from the high-precision finite element model; Based on the pressure time history data and soil strain parameters corresponding to different wave-seismic load combinations, the response effect of the target pile foundation structure is generated, wherein the response effect of the target pile foundation structure is the displacement value and stress value of the target pile foundation structure after being subjected to different wave-seismic load combinations, and the response effect of the target pile foundation structure under the extreme wave-seismic load combination is recorded and calibrated as the extreme response effect of the pile foundation structure; A response effect database is constructed, wherein the response effect database is a database that records different response effects of the target pile foundation structure. A resilience index system is constructed in combination with the response effect database, and the multi-hazard resilience of the target pile foundation structure is evaluated based on the resilience index system.

[0010] Furthermore, in a preferred embodiment of the present invention, the response effect database is combined to construct a resilience index system, and the multi-hazard resilience of the target pile foundation structure is evaluated based on the resilience index system, specifically: In combination with the response effect database, a toughness quantitative index system is defined, wherein the toughness quantitative index system includes a toughness coefficient and a toughness index, wherein the toughness coefficient is the ratio of the displacement value of the target pile foundation structure to the designed standard displacement value, and the toughness index is the ratio of the displacement value of the target pile foundation structure to the designed standard stress value; Based on the response effect database, the displacement value and stress value corresponding to the extreme response effect of the pile foundation structure of the target pile foundation structure are determined, and calibrated as a type of displacement value and a type of stress value. At the same time, based on the historical data network, the standard displacement value and stress value of the target pile foundation structure design under the extreme wave-seismic load combination are determined, and calibrated as a type of standard displacement value and a type of standard stress value; The ratio of a type of displacement value to a type of standard displacement value is calculated to obtain an extreme toughness coefficient, and the ratio of a type of stress value to a type of standard stress value is calculated to obtain an extreme toughness index, and the extreme toughness coefficient and the extreme toughness index are analyzed. If both the extreme toughness coefficient and the extreme toughness index are not greater than the preset values, the multi-hazard toughness of the target pile foundation structure is evaluated to be qualified; If the extreme toughness coefficient and the extreme toughness index are greater than the preset value, then based on the response effect database, the wave-seismic load combination corresponding to the target pile foundation structure when the toughness coefficient or toughness index is greater than the preset value is calculated and calibrated as a dangerous wave-seismic load combination. At the same time, the wave-seismic load combination corresponding to the toughness coefficient and toughness index of the target pile foundation structure when both are less than the preset value is calibrated as a safe wave-seismic load combination. A multi-hazard resilience analysis is performed on the target pile foundation structure. When the wave-seismic load combination is a safe wave-seismic load combination, the multi-hazard resilience of the target pile foundation structure is evaluated to be qualified. If the wave-seismic load combination is a dangerous wave-seismic load combination, the multi-hazard resilience of the target pile foundation structure is evaluated to be unqualified.

[0011] The second aspect of the present invention further provides a multi-hazard resilience assessment system for a pile foundation structure under extreme wave conditions, the multi-hazard resilience assessment system comprising a memory and a processor, the memory storing a multi-hazard resilience assessment method, and when the multi-hazard resilience assessment method is executed by the processor, the following steps are implemented: Conduct multi-factor coupling analysis on different wave parameters, different earthquake parameters and different soil parameters to build a multi-hazard scenario parameter system; Combined with the multi-hazard scenario parameter system, finite element software is used to construct a high-precision finite element model; The response effect of the target pile foundation structure under different load combinations is simulated through a high-precision finite element model, and a toughness index system is constructed based on the response effect to evaluate the multi-hazard resilience of the target pile foundation structure.

[0012] The present invention solves the technical defects existing in the background technology, and has the following beneficial effects: a multi-hazard scenario parameter system is constructed by a multi-element coupling analysis method, and a high-precision finite element model is constructed in combination with finite element software to simulate the response effect of the pile foundation structure under different load combinations, thereby constructing a toughness index system to achieve the multi-hazard resilience evaluation of the pile foundation structure. The present invention couples multiple factors such as waves, earthquakes, and soil parameters for the first time to conduct a multi-hazard resilience evaluation, which can more realistically reflect the mechanical behavior of the pile foundation structure under extreme disaster conditions, and provide a more reliable scientific basis for the design and construction of the pile foundation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0014] Figure 1A flow chart showing a multi-hazard resilience assessment method for pile foundation structures under extreme wave conditions; Figure 2 A flow chart of a method for constructing a high-precision finite element model is shown; Figure 3 A procedural view of the multi-hazard resilience assessment system for pile foundation structures under extreme wave conditions is shown. DETAILED DESCRIPTION

[0015] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0016] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0017] Figure 1 A flow chart showing a multi-hazard resilience assessment method for pile foundation structures under extreme wave conditions, comprising the following steps: S102: Conduct multi-factor coupling analysis on different wave parameters, different earthquake parameters and different soil parameters to construct a multi-hazard scenario parameter system; S104: Combined with the multi-hazard scenario parameter system, a high-precision finite element model is constructed using finite element software; S106: The response effect of the target pile foundation structure under different load combinations is simulated by a high-precision finite element model, and a toughness index system is constructed based on the response effect to evaluate the multi-hazard resilience of the target pile foundation structure.

[0018] Furthermore, in a preferred embodiment of the present invention, a multi-factor coupling analysis is performed on different wave parameters, different earthquake parameters and different soil parameters to construct a multi-disaster scenario parameter system, specifically: Obtain the pile foundation structure that needs to be evaluated for multi-hazard resilience, mark it as the target pile foundation structure, determine the sea area where the target pile foundation structure is located, mark it as the target sea area, and introduce the historical data network; In the historical data network, extreme values ​​of historical wave parameters and historical wave parameter ranges in the target sea area are retrieved, and extreme values ​​of historical earthquake parameters and historical earthquake parameter ranges of the plate where the target sea area is located are retrieved; Based on the historical wave parameter range of the target sea area and the historical earthquake parameter range of the plate where it is located, a load combination matrix of different historical wave parameters and historical earthquake parameters is established and calibrated as a wave-earthquake parameter load combination matrix; Mark the extreme values ​​of historical wave parameters and historical earthquake parameters in the wave-earthquake parameter load combination matrix to generate extreme wave-earthquake load combinations; Determine soil parameters of the target pile foundation structure, wherein the soil parameters of the target pile foundation structure are load combination parameters of sand and clay of the target pile foundation structure, and retrieve a controllable range of the soil parameters of the target pile foundation structure based on a historical data network; A multi-hazard scenario parameter system is constructed by combining the wave-seismic parameter load combination matrix, extreme wave-seismic load combination, and the controllable range of soil parameters of the target pile foundation structure.

[0019] It should be noted that traditional pile foundation structure assessment methods often only consider a single disaster factor, such as only considering wave loads or only considering earthquake loads, while ignoring the joint effects of other disaster factors. However, in actual engineering, pile foundation structures are often affected by multiple disaster factors at the same time, such as wave loads, earthquake loads, soil parameters and other factors. Therefore, it is necessary to construct a multi-hazard scenario parameter system to couple multiple factors such as waves, earthquakes, and soil parameters to conduct multi-hazard resilience assessment. Various data, including waves, earthquake parameters, and soil parameters, are stored in the historical data network. Constructing a wave-seismic parameter load combination matrix is ​​a disaster combination mode. There are different load combinations. Combined with soil parameters for coupling, that is, load time series coupling, a multi-hazard scenario parameter system can be directly constructed to simulate the dynamic response of wave loads and earthquake loads to pile foundation structures when constructing models, and to analyze the influence of their interaction on pile foundation structures.

[0020] Furthermore, in a preferred embodiment of the present invention, the response effect of the target pile foundation structure under different load combinations is simulated by a high-precision finite element model, and a toughness index system is constructed based on the response effect to evaluate the multi-hazard toughness of the target pile foundation structure, specifically: In the high-precision finite element model, different wave-seismic load combinations are constructed based on the multi-hazard scenario parameter system, in which the corresponding wave parameters and seismic parameters are recorded in the wave-seismic load combination; Apply different wave-seismic load combinations to the high-precision finite element model, and derive the pressure time history data and soil strain parameters corresponding to different wave-seismic load combinations from the high-precision finite element model; Based on the pressure time history data and soil strain parameters corresponding to different wave-seismic load combinations, the response effect of the target pile foundation structure is generated, wherein the response effect of the target pile foundation structure is the displacement value and stress value of the target pile foundation structure after being subjected to different wave-seismic load combinations, and the response effect of the target pile foundation structure under the extreme wave-seismic load combination is recorded and calibrated as the extreme response effect of the pile foundation structure; A response effect database is constructed, wherein the response effect database is a database that records different response effects of the target pile foundation structure. A resilience index system is constructed in combination with the response effect database, and the multi-hazard resilience of the target pile foundation structure is evaluated based on the resilience index system.

[0021] It should be noted that the multi-hazard resilience simulation analysis of the target pile foundation structure is performed using a high-precision finite element model. For example, the finite element software can be used to simulate the nonlinear response of the pile foundation structure under wave loads and seismic loads, taking into account the elastic-plastic properties of the soil, the large deformation of the pile body, etc., and the displacement, stress and strain distribution of the pile foundation structure can be obtained. This high-precision finite element model can more accurately simulate the mechanical behavior of the pile foundation structure and provide a more reliable basis for multi-hazard resilience assessment. According to the pressure time history data corresponding to different wave-seismic load combinations and the soil strain parameters, the response effect of the target pile foundation structure is generated, thereby establishing a resilience index system to achieve the purpose of evaluating the multi-hazard resilience of the target pile foundation structure.

[0022] Furthermore, in a preferred embodiment of the present invention, the response effect database is combined to construct a resilience index system, and the multi-hazard resilience of the target pile foundation structure is evaluated based on the resilience index system, specifically: In combination with the response effect database, a toughness quantitative index system is defined, wherein the toughness quantitative index system includes a toughness coefficient and a toughness index, wherein the toughness coefficient is the ratio of the displacement value of the target pile foundation structure to the designed standard displacement value, and the toughness index is the ratio of the displacement value of the target pile foundation structure to the designed standard stress value; Based on the response effect database, the displacement value corresponding to the extreme response effect of the pile foundation structure of the target pile foundation structure is determined and calibrated as a type of displacement value. At the same time, based on the historical data network, the standard displacement value of the target pile foundation structure design under the extreme wave-seismic load combination is determined and calibrated as a type of standard displacement value and a type of standard stress value. The ratio of a type of displacement value to a type of standard displacement value is calculated to obtain an extreme toughness coefficient, and the ratio of a type of displacement value to a type of standard stress value is calculated to obtain an extreme toughness index, and the extreme toughness coefficient and the extreme toughness index are analyzed. If both the extreme toughness coefficient and the extreme toughness index are not greater than the preset values, the multi-hazard toughness of the target pile foundation structure is evaluated to be qualified; If the extreme toughness coefficient and the extreme toughness index are greater than the preset value, then based on the response effect database, the wave-seismic load combination corresponding to the target pile foundation structure when the toughness coefficient or toughness index is greater than the preset value is calculated and calibrated as a dangerous wave-seismic load combination. At the same time, the wave-seismic load combination corresponding to the toughness coefficient and toughness index of the target pile foundation structure when both are less than the preset value is calibrated as a safe wave-seismic load combination. A multi-hazard resilience analysis is performed on the target pile foundation structure. When the wave-seismic load combination is a safe wave-seismic load combination, the multi-hazard resilience of the target pile foundation structure is evaluated to be qualified. If the wave-seismic load combination is a dangerous wave-seismic load combination, the multi-hazard resilience of the target pile foundation structure is evaluated to be unqualified.

[0023] It should be noted that in constructing a toughness index system, traditional pile foundation structure assessment methods often lack quantitative indicators to measure their disaster resistance, resulting in the difficulty of the assessment results to intuitively reflect their performance level. Quantitative assessment indicators such as toughness coefficient and toughness index have been established, which can intuitively reflect the multi-hazard resilience level of pile foundation structures and provide a scientific basis for engineering design and construction. For example, the toughness coefficient can be calculated as the ratio of the maximum displacement to the design displacement, and the toughness index can be calculated as the ratio of the maximum displacement to the maximum stress. These indicators can be used to measure the disaster resistance of pile foundation structures and compare them with other engineering structures. After calculating the toughness coefficient and toughness index, the extreme toughness coefficient and extreme toughness index are first determined. If the extreme toughness coefficient and extreme toughness index of the target pile foundation structure are qualified, it proves that the multi-hazard resilience of the target structure is qualified, that is, a safe structure. On the contrary, if there is a value greater than the preset value, it is necessary to find the critical point to determine the toughness of the pile foundation under different wave-seismic load combinations, because the toughness coefficient and toughness index of the pile foundation under different wave-seismic load combinations are different, and the toughness coefficient and toughness index of some combinations will be qualified. Under those combinations, the multi-hazard resilience of the pile foundation structure is qualified and safe. On the contrary, if the toughness coefficient and toughness index of some combinations are unqualified, they are unsafe. The disaster resistance of pile foundation structure can be measured according to the above method.

[0024] Figure 2 A flow chart of a method for constructing a high-precision finite element model is shown, comprising the following steps: S202: Combined with the multi-hazard scenario parameter system, a high-precision finite element model is constructed using finite element software; S204: Perform multi-physics field coupling loading processing on the multi-hazard scenario parameter system and the preliminary finite element model to obtain a high-precision finite element model.

[0025] Furthermore, in a preferred embodiment of the present invention, the multi-disaster scenario parameter system is combined and a high-precision finite element model is constructed using finite element software, specifically: Determine the composition and specifications of the target pile foundation structure, wherein the composition of the target pile foundation structure includes a pile body and a pile end extension area; Introducing finite element software, the finite element software can simulate different response modes of the target pile foundation structure under a multi-hazard scenario parameter system, in which the pile body is set as a shell unit and the pile end extension area is set as a solid unit; The shell element and the solid element are connected by Tie constraints, and the specifications of the target pile foundation structure are imported to obtain the target simulated pile foundation structure; Preset a simulated soil blank structure in the finite element software, create a pile-soil contact surface between the target simulated pile foundation structure and the simulated soil blank structure, and set a standard friction coefficient at the pile-soil contact surface, wherein the standard friction coefficient is obtained by searching the historical data network; Importing soil parameters of the target pile foundation structure into a simulated soil blank structure to obtain a preliminarily set simulated soil structure, dividing a sand layer and a clay layer in the preliminarily set simulated soil structure, and marking the intersection of the sand layer and the clay layer as an intersection boundary; The intersection boundaries include lateral boundaries and bottom boundaries, all intersection boundaries are highlighted, a target simulated soil structure is generated, and a preliminary finite element model is obtained by combining the target simulated pile foundation structure and the target simulated soil structure; The multi-hazard scenario parameter system and the preliminary finite element model are subjected to multi-physics field coupling loading processing to obtain a high-precision finite element model.

[0026] It should be noted that the present invention adopts advanced finite element software, can simulate the complex response of pile foundation structure under multi-factor coupling, including displacement, stress, strain, etc., and can consider factors such as material nonlinearity, geometric nonlinearity, so that the simulation result is closer to the actual situation. For example, finite element software can be used to simulate the nonlinear response of pile foundation structure under wave load and seismic load, consider the elastic-plastic characteristics of soil, large deformation of pile body, etc., and can obtain the displacement and stress distribution law of pile foundation structure. The model needs to be modeled by pile foundation structure, and the modeling needs to be divided step by step, the pile body and the pile end extension area are divided, and the shell unit is connected with the solid unit using Tie constraint, and the specification of the target pile foundation structure is imported at the same time, and the target simulation pile foundation structure is obtained. The Tie constraint is a model connection algorithm, and in combination with the pile-soil contact surface, a standard friction coefficient is set at the pile-soil contact surface, so that the purpose of generating the intersection boundary is to simulate the deformation and displacement of the pile foundation structure when being affected by the load combination, and the intersection boundary is a position that is easily affected by deformation and displacement. A preliminary finite element model can be obtained by combining the pile foundation structure and the soil structure, and a high-precision finite element model can be obtained by coupling multiple factors to the preliminary finite element model.

[0027] Furthermore, in a preferred embodiment of the present invention, the multi-disaster scenario parameter system and the preliminary finite element model are subjected to multi-physics field coupling loading processing to obtain a high-precision finite element model, specifically: Import the multi-hazard scenario parameter system into the preliminary finite element model, obtain CFD software, simulate the wave field in the preliminary finite element model by combining the multi-hazard scenario parameter system with the CFD software, and output the pressure time history data in real time in the preliminary finite element model; Wherein, the pressure time history data is the pressure data on the pile foundation structure caused by the wave impacting the pile foundation structure. Based on the pressure time history data, the pressure field is simulated in the preliminary finite element model, and the pressure field is mapped on the surface of the preliminary finite element model to obtain the pressure field mapping preliminary finite element model; Based on the multi-hazard scenario parameter system in the preliminary finite element model of pressure field mapping, the historical earthquake parameter range is converted into equivalent nodal force, and the equivalent nodal force is applied to the intersection boundary of the preliminary finite element model of pressure field mapping to obtain the preliminary finite element model to be trained; A standard training time step is set in the preliminary finite element model to be trained, and automatic iterative convergence training is performed. When the training time step is greater than the standard training time step, the automatic iterative convergence training is stopped, and a high-precision finite element model is output.

[0028] It should be noted that the preliminary finite element model needs to be trained and simulated with load combinations, that is, the purpose of applying wave loads and inputting earthquake motions is to simulate the wave field, thereby generating a pressure field, which is mapped on the surface of the pile foundation, so as to determine the displacement and deformation of the pile foundation. When the real-time simulation maps the pressure field on the surface of the preliminary finite element model and obtains the preliminary finite element model of the pressure field mapping, the impact of earthquake motion on the model is further analyzed, that is, the equivalent node force is applied to the bottom boundary of the soil body, and the training time is set. When the training time reaches the preset value, it proves that the training samples are sufficient and a high-precision finite element model can be directly obtained.

[0029] like Figure 3 As shown, the second aspect of the present invention further provides a multi-hazard resilience assessment system for a pile foundation structure under extreme wave conditions, the multi-hazard resilience assessment system comprising a memory 31 and a processor 32, the memory 31 stores a multi-hazard resilience assessment method, and when the multi-hazard resilience assessment method is executed by the processor 32, the following steps are implemented: Conduct multi-factor coupling analysis on different wave parameters, different earthquake parameters and different soil parameters to build a multi-hazard scenario parameter system; Combined with the multi-hazard scenario parameter system, finite element software is used to construct a high-precision finite element model; The response effect of the target pile foundation structure under different load combinations is simulated through a high-precision finite element model, and a toughness index system is constructed based on the response effect to evaluate the multi-hazard resilience of the target pile foundation structure.

[0030] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multi-hazard resilience assessment method for pile foundation structures under extreme wave conditions, characterized in that: The following steps are involved: Conduct multi-factor coupling analysis on different wave parameters, different earthquake parameters and different soil parameters to build a multi-hazard scenario parameter system; Combined with the multi-hazard scenario parameter system, finite element software is used to construct a high-precision finite element model; The response effect of the target pile foundation structure under different load combinations is simulated through a high-precision finite element model, and a toughness index system is constructed based on the response effect to evaluate the multi-hazard resilience of the target pile foundation structure.

2. The multi-hazard resilience assessment method for pile foundation structures under extreme wave conditions according to claim 1, characterized in that: The multi-factor coupling analysis of different wave parameters, different earthquake parameters and different soil parameters is performed to construct a multi-disaster scenario parameter system, specifically: Obtain the pile foundation structure that needs to be evaluated for multi-hazard resilience, mark it as the target pile foundation structure, determine the sea area where the target pile foundation structure is located, mark it as the target sea area, and introduce the historical data network; In the historical data network, extreme values ​​of historical wave parameters and historical wave parameter ranges in the target sea area are retrieved, and extreme values ​​of historical earthquake parameters and historical earthquake parameter ranges of the plate where the target sea area is located are retrieved; Based on the historical wave parameter range of the target sea area and the historical earthquake parameter range of the plate where it is located, a load combination matrix of different historical wave parameters and historical earthquake parameters is established and calibrated as a wave-earthquake parameter load combination matrix; Mark the extreme values ​​of historical wave parameters and historical earthquake parameters in the wave-earthquake parameter load combination matrix to generate extreme wave-earthquake load combinations; Determine soil parameters of the target pile foundation structure, wherein the soil parameters of the target pile foundation structure are load combination parameters of sand and clay of the target pile foundation structure, and retrieve a controllable range of the soil parameters of the target pile foundation structure based on a historical data network; A multi-hazard scenario parameter system is constructed by combining the wave-seismic parameter load combination matrix, extreme wave-seismic load combination, and the controllable range of soil parameters of the target pile foundation structure.

3. The multi-hazard resilience assessment method for pile foundation structures under extreme wave conditions according to claim 1, characterized in that: The multi-disaster scenario parameter system is combined with finite element software to construct a high-precision finite element model, specifically: Determine the composition and specifications of the target pile foundation structure, wherein the composition of the target pile foundation structure includes a pile body and a pile end extension area; Introducing finite element software, the finite element software can simulate different response modes of the target pile foundation structure under a multi-hazard scenario parameter system, in which the pile body is set as a shell unit and the pile end extension area is set as a solid unit; The shell element and the solid element are connected by Tie constraints, and the specifications of the target pile foundation structure are imported to obtain the target simulated pile foundation structure; Preset a simulated soil blank structure in the finite element software, create a pile-soil contact surface between the target simulated pile foundation structure and the simulated soil blank structure, and set a standard friction coefficient at the pile-soil contact surface, wherein the standard friction coefficient is obtained by searching the historical data network; Importing soil parameters of the target pile foundation structure into a simulated soil blank structure to obtain a preliminarily set simulated soil structure, dividing a sand layer and a clay layer in the preliminarily set simulated soil structure, and marking the intersection of the sand layer and the clay layer as an intersection boundary; The intersection boundaries include lateral boundaries and bottom boundaries, all intersection boundaries are highlighted, a target simulated soil structure is generated, and a preliminary finite element model is obtained by combining the target simulated pile foundation structure and the target simulated soil structure; The multi-hazard scenario parameter system and the preliminary finite element model are subjected to multi-physics field coupling loading processing to obtain a high-precision finite element model.

4. The multi-hazard resilience assessment method for pile foundation structures under extreme wave conditions according to claim 3, characterized in that: The multi-disaster scenario parameter system and the preliminary finite element model are subjected to multi-physics field coupling loading processing to obtain a high-precision finite element model, specifically: Import the multi-hazard scenario parameter system into the preliminary finite element model, obtain CFD software, simulate the wave field in the preliminary finite element model by combining the multi-hazard scenario parameter system with the CFD software, and output the pressure time history data in real time in the preliminary finite element model; Wherein, the pressure time history data is the pressure data on the pile foundation structure caused by the wave impacting the pile foundation structure. Based on the pressure time history data, the pressure field is simulated in the preliminary finite element model, and the pressure field is mapped on the surface of the preliminary finite element model to obtain the pressure field mapping preliminary finite element model; Based on the multi-hazard scenario parameter system in the preliminary finite element model of pressure field mapping, the historical earthquake parameter range is converted into equivalent nodal force, and the equivalent nodal force is applied to the intersection boundary of the preliminary finite element model of pressure field mapping to obtain the preliminary finite element model to be trained; A standard training time step is set in the preliminary finite element model to be trained, and automatic iterative convergence training is performed. When the training time step is greater than the standard training time step, the automatic iterative convergence training is stopped, and a high-precision finite element model is output.

5. The multi-hazard resilience assessment method for pile foundation structures under extreme wave conditions according to claim 1, characterized in that: The high-precision finite element model is used to simulate the response effect of the target pile foundation structure under different load combinations, and a toughness index system is constructed based on the response effect to evaluate the multi-hazard toughness of the target pile foundation structure, specifically: In the high-precision finite element model, different wave-seismic load combinations are constructed based on the multi-hazard scenario parameter system, in which the corresponding wave parameters and seismic parameters are recorded in the wave-seismic load combination; Apply different wave-seismic load combinations to the high-precision finite element model, and derive the pressure time history data and soil strain parameters corresponding to different wave-seismic load combinations from the high-precision finite element model; Based on the pressure time history data and soil strain parameters corresponding to different wave-seismic load combinations, the response effect of the target pile foundation structure is generated, wherein the response effect of the target pile foundation structure is the displacement value and stress value of the target pile foundation structure after being subjected to different wave-seismic load combinations, and the response effect of the target pile foundation structure under the extreme wave-seismic load combination is recorded and calibrated as the extreme response effect of the pile foundation structure; A response effect database is constructed, wherein the response effect database is a database that records different response effects of the target pile foundation structure. A resilience index system is constructed in combination with the response effect database, and the multi-hazard resilience of the target pile foundation structure is evaluated based on the resilience index system.

6. The multi-hazard resilience assessment method for pile foundation structures under extreme wave conditions according to claim 5, characterized in that: The above-mentioned combination of the response effect database, the construction of a resilience index system, and the evaluation of the multi-hazard resilience of the target pile foundation structure based on the resilience index system are as follows: In combination with the response effect database, a toughness quantitative index system is defined, wherein the toughness quantitative index system includes a toughness coefficient and a toughness index, wherein the toughness coefficient is the ratio of the displacement value of the target pile foundation structure to the designed standard displacement value, and the toughness index is the ratio of the displacement value of the target pile foundation structure to the designed standard stress value; Based on the response effect database, the displacement value and stress value corresponding to the extreme response effect of the pile foundation structure of the target pile foundation structure are determined, and calibrated as a type of displacement value and a type of stress value. At the same time, based on the historical data network, the standard displacement value and stress value of the target pile foundation structure design under the extreme wave-seismic load combination are determined, and calibrated as a type of standard displacement value and a type of standard stress value; The ratio of a type of displacement value to a type of standard displacement value is calculated to obtain an extreme toughness coefficient, and the ratio of a type of stress value to a type of standard stress value is calculated to obtain an extreme toughness index, and the extreme toughness coefficient and the extreme toughness index are analyzed. If both the extreme toughness coefficient and the extreme toughness index are not greater than the preset values, the multi-hazard toughness of the target pile foundation structure is evaluated to be qualified; If the extreme toughness coefficient and the extreme toughness index are greater than the preset value, then based on the response effect database, the wave-seismic load combination corresponding to the target pile foundation structure when the toughness coefficient or toughness index is greater than the preset value is calculated and calibrated as a dangerous wave-seismic load combination. At the same time, the wave-seismic load combination corresponding to the toughness coefficient and toughness index of the target pile foundation structure when both are less than the preset value is calibrated as a safe wave-seismic load combination. A multi-hazard resilience analysis is performed on the target pile foundation structure. When the wave-seismic load combination is a safe wave-seismic load combination, the multi-hazard resilience of the target pile foundation structure is evaluated to be qualified. If the wave-seismic load combination is a dangerous wave-seismic load combination, the multi-hazard resilience of the target pile foundation structure is evaluated to be unqualified.

7. Multi-hazard resilience assessment system for pile foundation structures under extreme wave conditions, characterized by: The multi-hazard resilience assessment system includes a memory and a processor. The memory stores a multi-hazard resilience assessment method program. When the multi-hazard resilience assessment method program is executed by the processor, the multi-hazard resilience assessment method steps as described in any one of claims 1 to 6 are implemented.

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