Multi-hazard Resilience Assessment Method for Pile Foundation Structures under Extreme Wave Conditions

Abstract

The present invention relates to the field of pile foundation toughness assessment, and discloses a multi-hazard toughness assessment method for pile foundation structures under extreme wave conditions, including the following steps: constructing a multi-hazard scenario parameter system through a multi-element coupling analysis method, and combining with finite element software to construct a high-precision finite element model for simulating the response effect of the pile foundation structure under different load combinations, thereby constructing a toughness index system to realize the assessment of the multi-hazard toughness of the pile foundation structure. The present invention for the first time couples various factors such as waves, earthquakes, and soil parameters for multi-hazard toughness assessment, which can more truly 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.

Description

Technical Field

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

[0002] I. With global climate change, the frequent occurrence of extreme wave events such as storm surges, tsunamis, and rogue waves poses a serious threat to the stability of ocean engineering structures, especially pile foundation structures. Traditional design methods often neglect the non-linear characteristics of extreme waves and the multi-hazard coupling effect, resulting in inaccurate assessment results under extreme conditions and being unable to effectively guarantee the structural safety. Existing assessment technologies lack a comprehensive consideration of the dynamic response and toughness capacity of pile foundation structures under the action of extreme waves, which limits their application value in practical engineering. Therefore, developing a method that can accurately assess the multi-hazard toughness of pile foundation structures under extreme wave conditions is of great significance for optimizing structural design, improving disaster resistance ability, and ensuring the safe operation of ocean engineering. The multi-hazard toughness assessment method for pile foundation structures under extreme wave conditions proposed by the present invention provides a scientific basis for the design and construction of pile foundation structures by constructing a non-linear model of extreme waves, analyzing the multi-hazard coupling effect, evaluating the dynamic response of pile foundation structures, and calculating toughness indicators. This method considers various factors such as wave force, water flow velocity, and seabed soil properties, and can comprehensively reflect the performance of pile foundation structures under extreme conditions.

[0003] To overcome the deficiencies of the prior art, the present invention proposes a multi-hazard toughness assessment method for pile foundation structures under extreme wave conditions. This method comprehensively considers the non-linear characteristics of extreme waves, the multi-hazard coupling effect, and the dynamic response of pile foundation structures, aiming to provide a more scientific and comprehensive assessment means 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, design parameters can be optimized, the toughness and disaster resistance ability of the structure can be improved, thereby ensuring the safe operation and sustainable development of ocean engineering. Through this method, the weak links of the structure can be effectively identified, design optimization can be guided, the disaster resistance toughness 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 ocean engineering and enhancing China's competitiveness in the international ocean engineering field. Summary of the Invention

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

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] In the first aspect of the present invention, a multi-hazard toughness assessment method for pile foundation structures under extreme wave conditions is provided, including the following steps:

[0007] Conduct multi - factor coupling analysis on different wave parameters, different seismic parameters, and different soil parameters to construct a multi - disaster scenario parameter system;

[0008] Combined with the multi - disaster scenario parameter system, use finite element software to construct a high - precision finite element model;

[0009] Simulate the response effect of the target pile foundation structure under different load combinations through the high - precision finite element model, and construct a toughness index system based on the response effect to evaluate the multi - disaster toughness of the target pile foundation structure.

[0010] Furthermore, in a preferred embodiment of the present invention, the conduct of multi - factor coupling analysis on different wave parameters, different seismic parameters, and different soil parameters to construct a multi - disaster scenario parameter system is specifically as follows:

[0011] Obtain the pile foundation structure that needs to be evaluated for multi - disaster toughness, label it as the target pile foundation structure, determine the sea area where the target pile foundation structure is located, label it as the target sea area, and introduce the historical data network;

[0012] In the historical data network, retrieve the historical wave parameter extreme values and historical wave parameter ranges at the target sea area, and at the same time retrieve the historical seismic parameter extreme values and historical seismic parameter ranges of the plate where the target sea area is located;

[0013] Based on the historical wave parameter range at the target sea area and the historical seismic parameter range of the plate where it is located, establish a load combination matrix of different historical wave parameters and historical seismic parameters, labeled as the wave - seismic parameter load combination matrix;

[0014] Mark the historical wave parameter extreme values and historical seismic parameter extreme values in the wave - seismic parameter load combination matrix to generate extreme wave - seismic load combinations;

[0015] Determine the soil parameters of the target pile foundation structure. The soil parameters of the target pile foundation structure are the load combination parameters of sand and clay of the target pile foundation structure, and retrieve the controllable range of the soil parameters of the target pile foundation structure based on the historical data network;

[0016] Combine the wave - seismic parameter load combination matrix, the extreme wave - seismic load combination, and the controllable range of the soil parameters of the target pile foundation structure to construct a multi - disaster scenario parameter system.

[0017] Furthermore, in a preferred embodiment of the present invention, the combination of the multi - disaster scenario parameter system and the use of finite element software to construct a high - precision finite element model is specifically as follows:

[0018] Determine the composition and specifications of the target pile foundation structure. Among them, the composition of the target pile foundation structure includes the pile body and the pile - end expansion area;

[0019] Introduce finite element software, which can simulate different response modes of the target pile foundation structure under the multi-hazard scenario parameter system. In the finite element software, set the pile body as a shell element and set the pile tip expansion area as a solid element;

[0020] Connect the shell element and the solid element through Tie constraint, and at the same time import the specifications of the target pile foundation structure to obtain the target simulated pile foundation structure;

[0021] 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, where the standard friction coefficient is obtained through historical data network retrieval;

[0022] Import the soil parameters of the target pile foundation structure into the simulated soil blank structure to obtain a preliminarily set simulated soil structure. Divide the sand layer and the clay layer in the preliminarily set simulated soil structure, and mark the intersection surface of the sand layer and the clay layer as the intersection boundary;

[0023] Among them, the intersection boundary includes a lateral boundary and a bottom boundary. Highlight all the intersection boundaries to generate the target simulated soil structure, and combine the target simulated pile foundation structure and the target simulated soil structure to obtain a preliminary finite element model;

[0024] Perform multi-physics field coupling loading on the multi-hazard scenario parameter system and the preliminary finite element model to obtain a high-precision finite element model.

[0025] Further, in a preferred embodiment of the present invention, the multi-hazard scenario parameter system and the preliminary finite element model are subjected to multi-physics field coupling loading to obtain a high-precision finite element model, specifically:

[0026] Import the multi-hazard scenario parameter system into the preliminary finite element model, and obtain CFD software. Combine the multi-hazard scenario parameter system through the CFD software to simulate the wave field in the preliminary finite element model, and at the same time output the pressure time history data in real time in the preliminary finite element model;

[0027] Among them, the pressure time history data is the pressure data generated by the wave impact on the pile foundation structure on the pile foundation structure. Based on the pressure time history data, simulate the pressure field in the preliminary finite element model, and map the pressure field on the surface of the preliminary finite element model to obtain a pressure field mapped preliminary finite element model;

[0028] In the preliminary finite element model of pressure field mapping, based on the multi-hazard scenario parameter system, convert the historical earthquake parameter range into equivalent nodal forces, and apply the equivalent nodal forces to the intersection boundary of the preliminary finite element model of pressure field mapping to obtain the preliminary finite element model to be trained;

[0029] Set the standard time step for training in the preliminary finite element model to be trained, and perform automatic iterative convergence training. When the training time step is greater than the standard time step for training, stop the automatic iterative convergence training and output the high-precision finite element model.

[0030] Furthermore, in a preferred embodiment of the present invention, the response effects of the target pile foundation structure under different load combinations are simulated by the high-precision finite element model, and a toughness index system is constructed based on the response effects to evaluate the multi-hazard toughness of the target pile foundation structure. Specifically:

[0031] In the high-precision finite element model, different wave-earthquake load combinations are constructed based on the multi-hazard scenario parameter system, and the corresponding wave parameters and earthquake parameters are recorded in the wave-earthquake load combinations;

[0032] Apply different wave-earthquake load combinations to the high-precision finite element model, and export the pressure time history data and soil strain parameters corresponding to different wave-earthquake load combinations from the high-precision finite element model;

[0033] Based on the pressure time history data and soil strain parameters corresponding to different wave-earthquake load combinations, generate the response effects of the target pile foundation structure, where the response effects of the target pile foundation structure are the displacement values and stress values of the target pile foundation structure after being subjected to different wave-earthquake load combinations, and at the same time record the response effects of the target pile foundation structure under extreme wave-earthquake load combinations, which are calibrated as the extreme response effects of the pile foundation structure;

[0034] Construct a response effect database, where the response effect database is a database that records different response effects of the target pile foundation structure. Combine the response effect database to construct a toughness index system, and evaluate the multi-hazard toughness of the target pile foundation structure based on the toughness index system.

[0035] Furthermore, in a preferred embodiment of the present invention, the combination of the response effect database to construct a toughness index system and evaluate the multi-hazard toughness of the target pile foundation structure based on the toughness index system is specifically as follows:

[0036] Combine the response effect database to define a toughness quantification index system, where the toughness quantification index system includes a toughness coefficient and a toughness index. 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;

[0037] Based on the response effect database, determine the displacement value and stress value corresponding to the extreme response effect of the target pile foundation structure, and calibrate them as the first-class displacement value and the first-class stress value. At the same time, based on the historical data network, determine the standard displacement value and stress value for the design of the target pile foundation structure under the extreme wave-earthquake load combination, and calibrate them as the first-class standard displacement value and the first-class standard stress value;

[0038] Calculate the ratio of the first-class displacement value to the first-class standard displacement value to obtain the extreme ductility coefficient, and calculate the ratio of the first-class stress value to the first-class standard stress value to obtain the extreme ductility index. Analyze the extreme ductility coefficient and the extreme ductility index. If both the extreme ductility coefficient and the extreme ductility index are not greater than the preset value, it is evaluated that the multi-hazard ductility of the target pile foundation structure is qualified;

[0039] If there are extreme ductility coefficients and extreme ductility indices greater than the preset value, based on the response effect database, calculate the wave-earthquake load combination corresponding to the case where the ductility coefficient or ductility index of the target pile foundation structure is greater than the preset value, and calibrate it as the dangerous wave-earthquake load combination. At the same time, calibrate the wave-earthquake load combination corresponding to the case where the ductility coefficient and ductility index of the target pile foundation structure are both less than the preset value as the safe wave-earthquake load combination;

[0040] Conduct a multi-hazard ductility analysis on the target pile foundation structure. When the wave-earthquake load combination is the safe wave-earthquake load combination, it is evaluated that the multi-hazard ductility of the target pile foundation structure is qualified. If the wave-earthquake load combination is the dangerous wave-earthquake load combination, it is evaluated that the multi-hazard ductility of the target pile foundation structure is unqualified.

[0041] The second aspect of the present invention also provides a multi-hazard ductility assessment system for pile foundation structures under extreme wave conditions. The multi-hazard ductility assessment system includes a memory and a processor. The memory stores a multi-hazard ductility assessment method. When the multi-hazard ductility assessment method is executed by the processor, the following steps are realized:

[0042] Conduct a multi-factor coupling analysis on different wave parameters, different earthquake parameters, and different soil parameters to construct a multi-hazard scenario parameter system;

[0043] Combined with the multi-hazard scenario parameter system, use finite element software to construct a high-precision finite element model;

[0044] Simulate the response effect of the target pile foundation structure under different load combinations through the high-precision finite element model, and construct a ductility index system based on the response effect to evaluate the multi-hazard ductility of the target pile foundation structure.

[0045] The technical defects existing in the background art solved by the present invention, and the present invention has the following beneficial effects: By constructing a multi-disaster scenario parameter system through multi-element coupling analysis method, and combining with finite element software to construct a high-precision finite element model for simulating the response effect of the pile foundation structure under different load combinations, so as to construct a toughness index system and realize the evaluation of the multi-disaster toughness of the pile foundation structure. The present invention first couples various factors such as waves, earthquakes, and soil parameters for multi-disaster toughness evaluation, which can more truly 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

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0047] Figure 1 Shows a flowchart of a multi-disaster toughness evaluation method for a pile foundation structure under extreme wave conditions;

[0048] Figure 2 Shows a flowchart of a method for constructing a high-precision finite element model;

[0049] Figure 3 Shows a program view of a multi-disaster toughness evaluation system for a pile foundation structure under extreme wave conditions. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other in load combinations.

[0051] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0052] Figure 1 Shows a flowchart of a multi-disaster toughness evaluation method for a pile foundation structure under extreme wave conditions, including the following steps:

[0053] S102: Conduct multi-factor coupling analysis on different wave parameters, different earthquake parameters and different soil parameters to construct a multi-disaster scenario parameter system;

[0054] S104: Combine with the multi-hazard scenario parameter system and use finite element software to construct a high-precision finite element model;

[0055] S106: Simulate the response of the target pile foundation structure under different load combinations through the high-precision finite element model, and construct a toughness index system based on the response to evaluate the multi-hazard toughness of the target pile foundation structure.

[0056] Further, in a preferred embodiment of the present invention, the multi-factor coupling analysis of different wave parameters, different seismic parameters, and different soil parameters to construct a multi-hazard scenario parameter system is specifically as follows:

[0057] Obtain the pile foundation structure that needs to be evaluated for multi-hazard toughness, label it as the target pile foundation structure, determine the sea area where the target pile foundation structure is located, label it as the target sea area, and introduce the historical data network;

[0058] In the historical data network, retrieve the extreme values and ranges of historical wave parameters at the target sea area, and at the same time retrieve the extreme values and ranges of historical seismic parameters of the plate where the target sea area is located;

[0059] Based on the range of historical wave parameters and the range of historical seismic parameters at the target sea area, establish a load combination matrix of different historical wave parameters and historical seismic parameters, labeled as the wave-seismic parameter load combination matrix;

[0060] Mark the extreme values of historical wave parameters and historical seismic parameters in the wave-seismic parameter load combination matrix to generate extreme wave-seismic load combinations;

[0061] Determine the soil parameters of the target pile foundation structure. The soil parameters of the target pile foundation structure are the load combination parameters of the sand and clay of the target pile foundation structure. Based on the historical data network, retrieve the controllable range of the soil parameters of the target pile foundation structure;

[0062] Combine the wave-seismic parameter load combination matrix, the extreme wave-seismic load combination, and the controllable range of the soil parameters of the target pile foundation structure to construct a multi-hazard scenario parameter system.

[0063] 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 seismic loads, while ignoring the combined effects of other disaster factors. However, in actual engineering, pile foundation structures are often subjected to the combined effects of multiple disaster factors, such as being affected by wave loads, seismic loads, soil parameters, etc. simultaneously. Therefore, it is necessary to construct a multi-disaster scenario parameter system to couple multiple factors such as waves, earthquakes, and soil parameters for multi-disaster resilience assessment. The historical data network stores various data, including wave, seismic parameters, soil parameters, etc. Constructing a wave-earthquake parameter load combination matrix is a disaster combination mode with different load combinations. Coupling with soil parameters, that is, performing load time series coupling, can directly construct a multi-disaster scenario parameter system, which plays a conditional role in simulating the dynamic responses of wave loads and seismic loads on the pile foundation structure when constructing a model and analyzing the influence of their interaction on the pile foundation structure.

[0064] Furthermore, in a preferred embodiment of the present invention, the response effects of the target pile foundation structure under different load combinations are simulated through a high-precision finite element model, and a resilience index system is constructed based on the response effects for evaluating the multi-disaster resilience of the target pile foundation structure. Specifically:

[0065] In the high-precision finite element model, different wave-earthquake load combinations are constructed based on the multi-disaster scenario parameter system, where the corresponding wave parameters and seismic parameters are recorded in the wave-earthquake load combination.

[0066] Apply different wave-earthquake load combinations to the high-precision finite element model, and export the pressure time history data and soil strain parameters corresponding to different wave-earthquake load combinations from the high-precision finite element model.

[0067] Based on the pressure time history data and soil strain parameters corresponding to different wave-earthquake load combinations, generate the response effects of the target pile foundation structure, where the response effects of the target pile foundation structure are the displacement values and stress values of the target pile foundation structure after being subjected to different wave-earthquake load combinations, and at the same time record the response effects of the target pile foundation structure under the extreme wave-earthquake load combination, which are calibrated as the extreme response effects of the pile foundation structure.

[0068] Construct a response effect database, where the response effect database is a database that records different response effects of the target pile foundation structure. Combine the response effect database to construct a resilience index system and evaluate the multi-disaster resilience of the target pile foundation structure based on the resilience index system.

[0069] It should be noted that when using a high-precision finite element model to conduct multi-hazard resilience simulation analysis of the target pile foundation structure, for example, a finite element software can be used to simulate the nonlinear response of the pile foundation structure under wave loads and seismic loads, considering the elastoplastic properties of the soil, large deformations of the pile body, etc., and the distribution laws of displacements, stresses, and strains of the pile foundation structure can be obtained. Such a 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.

[0070] Furthermore, in a preferred embodiment of the present invention, the method of constructing a resilience index system in combination with the response effect database and evaluating the multi-hazard resilience of the target pile foundation structure based on the resilience index system is specifically as follows:

[0071] In combination with the response effect database, a resilience quantification index system is defined. Among them, the resilience quantification index system includes a resilience coefficient and a resilience index. The resilience coefficient is the ratio of the displacement value of the target pile foundation structure to the designed standard displacement value, and the resilience index is the ratio of the displacement value of the target pile foundation structure to the designed standard stress value;

[0072] 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 first-class displacement value. At the same time, based on the historical data network, the designed standard displacement value of the target pile foundation structure under the extreme wave-seismic load combination is determined and calibrated as a first-class standard displacement value and a first-class standard stress value;

[0073] Calculate the ratio of the first-class displacement value to the first-class standard displacement value to obtain the extreme resilience coefficient, and calculate the ratio of the first-class displacement value to the first-class standard stress value to obtain the extreme resilience index. Analyze the extreme resilience coefficient and the extreme resilience index. If both the extreme resilience coefficient and the extreme resilience index are not greater than the preset value, it is evaluated that the multi-hazard resilience of the target pile foundation structure is qualified;

[0074] If there are values of the extreme resilience coefficient and the extreme resilience index greater than the preset value, based on the response effect database, calculate the wave-seismic load combination corresponding to the situation where the resilience coefficient or the resilience index of the target pile foundation structure is greater than the preset value, and calibrate it as a dangerous wave-seismic load combination. At the same time, calibrate the wave-seismic load combination corresponding to the situation where the resilience coefficient and the resilience index of the target pile foundation structure are both less than the preset value as a safe wave-seismic load combination;

[0075] Conduct multi-hazard resilience analysis on the target pile foundation structure. When the wave-earthquake load combination is a safe wave-earthquake load combination, it is evaluated that the multi-hazard resilience of the target pile foundation structure is qualified. If the wave-earthquake load combination is a dangerous wave-earthquake load combination, it is evaluated that the multi-hazard resilience of the target pile foundation structure is unqualified.

[0076] It should be noted that when constructing a resilience index system, traditional pile foundation structure evaluation methods often lack quantitative indicators to measure their disaster resistance capabilities, resulting in the evaluation results being difficult to intuitively reflect their performance levels. Quantified evaluation indicators such as resilience coefficients and resilience indices are 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 resilience coefficient can be calculated as the ratio of the maximum displacement to the design displacement, and the resilience 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 capabilities of pile foundation structures and compare them with other engineering structures. After calculating the resilience coefficient and resilience index, first determine the extreme resilience coefficient and extreme resilience index. If both the extreme resilience coefficient and extreme resilience index of the target pile foundation structure are qualified, it proves that the target pile foundation structure is multi-hazard resilient and thus a safe structure. On the contrary, if there are values greater than the preset values, it is necessary to find the critical points to determine the resilience of the pile foundation under different wave-earthquake load combinations. Because the resilience coefficients and resilience indices of the pile foundation are different under different wave-earthquake load combinations, the resilience coefficients and resilience indices of some combinations will be qualified, and under those combinations, the multi-hazard resilience of the pile foundation structure is qualified and it is safe. On the contrary, if the resilience coefficients and resilience indices of some combinations are unqualified, it is unsafe. The disaster resistance capabilities of pile foundation structures can be measured according to the above methods.

[0077] Figure 2 The method flow chart for constructing a high-precision finite element model is shown, including the following steps:

[0078] S202: Combine the multi-hazard scenario parameter system and use finite element software to construct a high-precision finite element model;

[0079] 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.

[0080] Furthermore, in a preferred embodiment of the present invention, the step of combining the multi-hazard scenario parameter system and using finite element software to construct a high-precision finite element model is specifically:

[0081] Determine the composition and specifications of the target pile foundation structure. Among them, the composition of the target pile foundation structure includes the pile body and the pile tip expansion area;

[0082] Introduce finite element software, which can simulate different response modes of the target pile foundation structure under the multi-hazard scenario parameter system. In the finite element software, set the pile body as a shell element and the pile tip extended area as a solid element;

[0083] Connect the shell element and the solid element through Tie constraints, and at the same time import the specifications of the target pile foundation structure to obtain the target simulated pile foundation structure;

[0084] 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, where the standard friction coefficient is obtained by retrieving historical data from the network;

[0085] Import the soil parameters of the target pile foundation structure into the simulated soil blank structure to obtain a preliminarily set simulated soil structure. Divide the sand layer and the clay layer in the preliminarily set simulated soil structure, and mark the intersection surface of the sand layer and the clay layer as the intersection boundary;

[0086] Among them, the intersection boundary includes a lateral boundary and a bottom boundary. Highlight all the intersection boundaries to generate the target simulated soil structure. Combine the target simulated pile foundation structure and the target simulated soil structure to obtain a preliminary finite element model;

[0087] Perform multi-physics field coupling loading on the multi-hazard scenario parameter system and the preliminary finite element model to obtain a high-precision finite element model.

[0088] It should be noted that the present invention uses advanced finite element software, which can simulate the complex responses of the pile foundation structure under the coupling action of multiple factors, including displacement, stress, strain, etc., and can consider factors such as material nonlinearity and geometric nonlinearity, making the simulation results closer to the actual situation. For example, finite element software can be used to simulate the nonlinear responses of the pile foundation structure under wave loads and seismic loads, consider the elastoplastic properties of the soil and the large deformations of the pile body, etc., and can obtain the displacement and stress distribution laws of the pile foundation structure. Building a model requires modeling of the pile foundation structure, and the modeling needs to be carried out step by step. Divide the pile body and the pile tip extended area, and use Tie constraints to connect the shell element and the solid element. At the same time, import the specifications of the target pile foundation structure to obtain the target simulated pile foundation structure. The Tie constraint is a model connection algorithm. By combining the pile-soil contact surface and setting a standard friction coefficient at the pile-soil contact surface, the purpose of generating the intersection boundary is to simulate the deformation and displacement of the pile foundation structure when affected by the load combination. The intersection boundary is the position prone to deformation and displacement. Combining the pile foundation structure and the soil structure can obtain a preliminary finite element model, and performing coupling analysis of various factors on the obtained preliminary finite element model can obtain a high-precision finite element model.

[0089] Further, 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 to obtain a high-precision finite element model, specifically as follows:

[0090] Import the multi-disaster scenario parameter system into the preliminary finite element model, obtain the CFD software, and combine the multi-disaster scenario parameter system through the CFD software to simulate the wave field in the preliminary finite element model, and at the same time, output the pressure time history data in real time in the preliminary finite element model;

[0091] Among them, the pressure time history data is the pressure data generated by the wave impact on the pile foundation structure on 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 a pressure field mapped preliminary finite element model;

[0092] Based on the multi-disaster scenario parameter system in the pressure field mapped preliminary finite element model, convert the historical earthquake parameter range into equivalent nodal forces, and apply the equivalent nodal forces to the intersection boundary of the pressure field mapped preliminary finite element model to obtain a preliminary finite element model to be trained;

[0093] Set the training time standard step length in the preliminary finite element model to be trained, and perform automatic iterative convergence training. When the training time step length is greater than the training time standard step length, stop the automatic iterative convergence training and output the high-precision finite element model.

[0094] It should be noted that it is necessary to perform load combination training simulation on the preliminary finite element model, that is, the purpose of applying wave loads and earthquake ground motion input is to simulate the wave field, thereby generating a pressure field and mapping it on the pile foundation surface to judge the displacement and deformation of the pile foundation. When the pressure field is mapped on the surface of the preliminary finite element model in real-time simulation to obtain a pressure field mapped preliminary finite element model, continue to analyze the influence of the earthquake ground motion on the model, that is, apply the equivalent nodal forces to the bottom boundary of the soil body and set the training time. When the training time reaches the preset value, it is proved that the training samples are sufficient and a high-precision finite element model can be directly obtained.

[0095] As Figure 3 shown, in the second aspect of the present invention, a multi-disaster resilience evaluation system for pile foundation structures under extreme wave conditions is also provided. The multi-disaster resilience evaluation system includes a memory 31 and a processor 32. The memory 31 stores a multi-disaster resilience evaluation method. When the multi-disaster resilience evaluation method is executed by the processor 32, the following steps are implemented:

[0096] Perform multi-factor coupling analysis on different wave parameters, different earthquake parameters, and different soil parameters to construct a multi-disaster scenario parameter system;

[0097] Combined with the multi-hazard scenario parameter system, a high-precision finite element model is constructed using finite element software;

[0098] Through the high-precision finite element model, the response effects of the target pile foundation structure under different load combinations are simulated, and a toughness index system is constructed based on the response effects to evaluate the multi-hazard toughness of the target pile foundation structure.

[0099] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for evaluating the multi-hazard resilience of pile foundation structures under extreme wave conditions, characterized in that, It includes the following steps: Conduct multi-factor coupling analysis on different wave parameters, different seismic parameters, and different soil parameters to construct a multi-disaster scenario parameter system; Combined with the multi-disaster scenario parameter system, use finite element software to construct a high-precision finite element model; Simulate the response effect of the target pile foundation structure under different load combinations through the high-precision finite element model, and construct a ductility index system based on the response effect to evaluate the multi-disaster ductility of the target pile foundation structure; Among them, combined with the multi-disaster scenario parameter system, using finite element software to construct a high-precision finite element model, specifically: Determine the composition and specifications of the target pile foundation structure. Among them, the composition of the target pile foundation structure includes the pile body and the pile tip expansion area; Introduce finite element software, which is used to simulate different response modes of the target pile foundation structure under the multi-disaster scenario parameter system. In the finite element software, set the pile body as a shell element and the pile tip expansion area as a solid element; Connect the shell element and the solid element through Tie constraints, and at the same time import the specifications of the target pile foundation structure 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, where the standard friction coefficient is obtained by retrieving historical data networks; Import the soil parameters of the target pile foundation structure into the simulated soil blank structure to obtain a preliminary set simulated soil structure. Divide the sand layer and the clay layer in the preliminary set simulated soil structure, and mark the intersection surface of the sand layer and the clay layer as the intersection boundary; Among them, the intersection boundary includes the lateral boundary and the bottom boundary. Highlight all intersection boundaries to generate the target simulated soil structure. Combine the target simulated pile foundation structure and the target simulated soil structure to obtain a preliminary finite element model; Conduct multi-physical field coupling loading on the multi-disaster scenario parameter system and the preliminary finite element model to obtain a high-precision finite element model.

2. The multi-hazard resilience assessment method of the pile foundation structure under extreme wave conditions according to claim 1, characterized in that The multi-factor coupling analysis of different wave parameters, different seismic parameters, and different soil parameters to construct a multi-disaster scenario parameter system is specifically: Obtain the pile foundation structure that needs to be evaluated for multi-disaster ductility, label it as the target pile foundation structure, determine the sea area where the target pile foundation structure is located, label it as the target sea area, and introduce the historical data network; In the historical data network, retrieve the historical wave parameter extreme values and historical wave parameter ranges at the target sea area, and at the same time retrieve the historical seismic parameter extreme values and historical seismic parameter ranges of the plate where the target sea area is located; Based on the historical wave parameter range at the target sea area and the historical seismic parameter range of the plate where it is located, establish a load combination matrix of different historical wave parameters and historical seismic parameters, labeled as the wave-seismic parameter load combination matrix; Mark the historical wave parameter extreme values and historical seismic parameter extreme values in the wave-seismic parameter load combination matrix to generate extreme wave-seismic load combinations; Determine the soil parameters of the target pile foundation structure. The soil parameters of the target pile foundation structure are the load combination parameters of the sand and clay of the target pile foundation structure. Based on the historical data network, retrieve the controllable range of the soil parameters of the target pile foundation structure; Combine the wave - earthquake parameter load combination matrix, the extreme wave - earthquake load combination, and the controllable range of the soil parameters of the target pile foundation structure to construct a multi - disaster scenario parameter system.

3. The multi-hazard resilience assessment method for pile foundation structures under extreme wave conditions according to claim 1, wherein Perform multi - physical - field coupling loading on the multi - disaster scenario parameter system and the preliminary finite element model to obtain a high - precision finite element model. Specifically: Import the multi - disaster scenario parameter system into the preliminary finite element model, and obtain CFD software. Combine the multi - disaster scenario parameter system through the CFD software to simulate the wave field in the preliminary finite element model, and simultaneously output the pressure time - history data in real - time in the preliminary finite element model; Among them, the pressure time - history data is the pressure data generated by the wave impact on the pile foundation structure on the pile foundation structure. Based on the pressure time - history data, simulate the pressure field in the preliminary finite element model, and map the pressure field on the surface of the preliminary finite element model to obtain a pressure - field - mapped preliminary finite element model; Based on the multi - disaster scenario parameter system in the pressure - field - mapped preliminary finite element model, convert the historical earthquake parameter range into equivalent nodal forces, and apply the equivalent nodal forces to the intersection boundary of the pressure - field - mapped preliminary finite element model to obtain a preliminary finite element model to be trained; Set the training time standard step in the preliminary finite element model to be trained, and perform automatic iterative convergence training. When the training time step is greater than the training time standard step, stop the automatic iterative convergence training and output a high - precision finite element model.

4. The multi-hazard resilience assessment method for pile foundation structures under extreme wave conditions according to claim 1, wherein Simulate the response effect of the target pile foundation structure under different load combinations through the high - precision finite element model, and construct a toughness index system based on the response effect to evaluate the multi - disaster toughness of the target pile foundation structure. Specifically: In the high - precision finite element model, based on the multi - disaster scenario parameter system, construct different wave - earthquake load combinations, where the wave - earthquake load combinations record the corresponding wave parameters and earthquake parameters; Apply different wave - earthquake load combinations to the high - precision finite element model, and export the pressure time - history data and soil strain parameters corresponding to different wave - earthquake load combinations from the high - precision finite element model; Generate the response effect of the target pile foundation structure based on the pressure time - history data and soil strain parameters corresponding to different wave - earthquake load combinations. Among them, 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 - earthquake load combinations. At the same time, record the response effect of the target pile foundation structure under the extreme wave - earthquake load combination, which is calibrated as the extreme response effect of the pile foundation structure; Construct a response effect database, where the response effect database is a database that records different response effects of the target pile foundation structure. Combine the response effect database, construct a toughness index system, and evaluate the multi - disaster toughness of the target pile foundation structure based on the toughness index system.

5. The multi-hazard resilience assessment method for pile foundation structures under extreme wave conditions according to claim 4, characterized in that, Combined with the response effect database, a resilience index system is constructed, and the multi-hazard resilience of the target pile foundation structure is evaluated based on the resilience index system, specifically as follows: Combined with the response effect database, a resilience quantification index system is defined. Among them, the resilience quantification index system includes a resilience coefficient and a resilience index. The resilience coefficient is the ratio of the displacement value of the target pile foundation structure to the designed standard displacement value, and the resilience 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, determine the displacement value and stress value corresponding to the extreme response effect of the pile foundation structure of the target pile foundation structure, and calibrate them as the first-class displacement value and the first-class stress value. At the same time, based on the historical data network, determine the designed standard displacement value and stress value of the target pile foundation structure under the extreme wave-earthquake load combination, and calibrate them as the first-class standard displacement value and the first-class standard stress value; Calculate the ratio of the first-class displacement value to the first-class standard displacement value to obtain the extreme resilience coefficient, and calculate the ratio of the first-class displacement value to the first-class standard stress value to obtain the extreme resilience index. Analyze the extreme resilience coefficient and the extreme resilience index. If both the extreme resilience coefficient and the extreme resilience index are not greater than the preset value, it is evaluated that the multi-hazard resilience of the target pile foundation structure is qualified; If the extreme resilience coefficient and the extreme resilience index are greater than the preset value, based on the response effect database, calculate the wave-earthquake load combination corresponding to the situation where the resilience coefficient or the resilience index of the target pile foundation structure is greater than the preset value, and calibrate it as the dangerous wave-earthquake load combination. At the same time, calibrate the wave-earthquake load combination corresponding to the situation where the resilience coefficient and the resilience index of the target pile foundation structure are both less than the preset value as the safe wave-earthquake load combination; Conduct a multi-hazard resilience analysis on the target pile foundation structure. When the wave-earthquake load combination is the safe wave-earthquake load combination, it is evaluated that the multi-hazard resilience of the target pile foundation structure is qualified. If the wave-earthquake load combination is the dangerous wave-earthquake load combination, it is evaluated that the multi-hazard resilience of the target pile foundation structure is unqualified.

6. A multi-hazard resilience assessment system for pile foundation structures under extreme wave conditions, characterized in that, 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 steps of the multi-hazard resilience assessment method described in any one of claims 1-5 are implemented.

Images