A method for quantitatively analyzing full nonlinearity and additional nonlinearity of a sea site under dynamic load

Abstract

The application provides a quantitative analysis method for full nonlinearity and additional nonlinearity of a sea area site under a dynamic load, and the method comprises the following steps: establishing a sea area site model (without structure), a direct coupling method model and a step-by-step coupling method model, comparing and analyzing the differentiated results of the dynamic responses of the three models in the time domain, and finally forming a set of methods suitable for the marine dynamic load environment, which can quantitatively analyze the full nonlinearity and additional nonlinearity of the site. The method can accurately quantitatively analyze the influence of the nonlinearity of the sea area site on the dynamic response, so as to clearly determine the necessity or replaceability of the overall coupling analysis of the soil and the structure. In addition, the application also provides a step-by-step coupling method, which provides a new choice for the geotechnical design of the marine engineering, greatly improves the design efficiency and reduces the calculation cost, and is extremely suitable for the engineering design.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine geotechnical engineering, and particularly relates to a method for quantitatively analyzing full nonlinearity and additional nonlinearity of a sea area site under dynamic load. BACKGROUND

[0002] The marine environment is complex, and there are various dynamic loads, including strong wind, sea waves, sea currents, earthquakes, etc., which undoubtedly pose a great challenge to the design and construction of offshore wind power structures, supporting structures and offshore platforms and other offshore engineering. In the design and construction of marine engineering, deep overburden is inevitably encountered, and the dynamic response of soil sites in the sea area is obviously more complex than that of lithological sites. In addition, the interaction between soil and structure often directly affects the dynamic response characteristics of the structure itself and the soil around the structure, and has a great influence on the structure and the site, which cannot be ignored.

[0003] The analysis of the interaction between soil and structure is generally divided into the substructure method and the direct method. The substructure method divides the site and the structure into different subsystems, and is usually solved in the frequency domain, which is efficient, but the equivalent linearization method is used to simulate the nonlinear characteristics of the soil, which will significantly underestimate the dynamic response of the structure under dynamic load, and can only be applied to horizontally layered sites. The direct method, also known as the integral method, analyzes the structure-site system as a whole, and generally performs numerical analysis in the time domain. This method not only considers the strong nonlinearity of the soil through the dynamic constitutive model of the soil, but also is suitable for complex heterogeneous soil sites.

[0004] However, for various marine engineering conditions, the substructure method has certain limitations, and the modeling and calculation cost of the direct method is too high, which is less applicable and less economical for marine engineering. At present, most research and technology only support the qualitative analysis of the interaction effect between soil and structure and the nonlinearity of the site, which has certain limitations. SUMMARY

[0005] The present application aims to provide a method for quantitatively analyzing full nonlinearity and additional nonlinearity of a sea area site under dynamic load, which can compare and analyze the differentiated results of the dynamic responses of three models in the time domain by establishing a sea area site model (without structure), a direct coupling method model and a step-by-step coupling method model, and ultimately form a method for quantitatively analyzing full nonlinearity and additional nonlinearity of a sea area site suitable for marine dynamic load environment. This method can accurately quantitatively analyze the influence of the nonlinearity of the sea area site on the dynamic response, thereby determining the necessity or replaceability of the overall coupling analysis of soil and structure. In addition, the present application also proposes a step-by-step coupling method, which provides a new choice for the geotechnical design of marine engineering, greatly improves the design efficiency and reduces the calculation cost, and has strong applicability for engineering design.

[0006] It specifically adopts the following technical solutions:

[0007] A method for quantitatively analyzing full nonlinearity and additional nonlinearity of a sea field under dynamic load:

[0008] By establishing an upper structure model, numerical simulation of the upper structure is realized; on this basis, the structural dynamic response is calculated without considering the influence of the nonlinearity of the sea field under ideal rigid foundation conditions;

[0009] The soil of the sea field is described by an elastic-plastic dynamic constitutive model, and a full-coupled upper structure-foundation-ground overall system is directly constructed to realize numerical simulation based on the direct coupling method; on this basis, the structural dynamic response is calculated considering the influence of the full nonlinearity of the sea field;

[0010] The dynamic response of the unstructured sea field model is calculated, and the equivalent linearized soil parameters are calibrated based on the maximum shear strain level of each soil layer; then the calibrated values are used to define the soil, and the upper structure-foundation-ground overall system is constructed to realize numerical simulation based on the step-by-step coupling method; on this basis, the structural dynamic response is calculated considering the influence of the original nonlinearity of the sea field;

[0011] By comparing and analyzing the structural dynamic response results of the upper structure model and the direct coupling method model, the influence of the full nonlinearity of the sea field is quantitatively analyzed;

[0012] By comparing and analyzing the structural dynamic response results of the direct coupling method model and the step-by-step coupling method model, the influence of the additional nonlinearity of the sea field is quantitatively analyzed.

[0013] Wherein, the dynamic load refers to various dynamic loads or combined loads such as earthquakes, waves, and ocean currents, the full nonlinearity of the sea field includes the original nonlinearity of the sea field and the additional nonlinearity of the sea field, the original nonlinearity of the sea field refers to the nonlinearity of the stress-strain relationship of the sea field soil under the action of dynamic load under the condition of the sea field (unstructured), the additional nonlinearity of the sea field refers to the additional nonlinearity of the sea field soil material caused by the interaction effect (Soil-Structure Interaction, SSI) between the sea field soil and the structure under the action of dynamic load due to the existence of the structure above the seabed and the foundation in the actual marine environment.

[0014] Further, the upper structure includes the structure and components above the seabed and the foundation, the model is established based on the finite element analysis method, the material of the upper structure is simulated by a linear elastic constitutive model, and a fixed boundary is applied at the bottom of the upper structure to simulate the ideal rigid foundation condition.

[0015] Further, in the implementation of the direct coupling method, a full coupling system model of the superstructure-foundation-flexible foundation is constructed to consider the SSI effect, and the dynamic nonlinear and complex characteristics of the sea field soil material are described by an elastic-plastic constitutive model.

[0016] Further, in the implementation of the step-by-step coupling method, first, a site model is established for the sea field without the superstructure and the foundation, the dynamic nonlinear and complex characteristics of the soil are described by an elastic-plastic constitutive model, a dynamic load is applied, the maximum shear strain level of each soil layer is calculated, and the maximum shear strain level of 0.65 times is taken as the equivalent shear strain to mark the corresponding numerical value on the stiffness parameter and damping parameter curve; then, the calibrated equivalent stiffness parameter and equivalent damping parameter compatible with the soil element strain are taken as the input parameters of the viscoelastic soil body to construct the overall system of the superstructure-foundation-foundation.

[0017] Further, in the calculation of the structural dynamic response without considering the nonlinear effect of the sea field under the ideal rigid foundation condition, a dynamic time-history load is applied to the superstructure model, and the dynamic response of the superstructure without considering the nonlinear effect of the sea field is calculated in the time domain.

[0018] Further, in the calculation of the structural dynamic response considering the full nonlinear effect of the sea field, a dynamic time-history load is applied to the direct coupling method model, and the dynamic response of the superstructure considering the full nonlinear effect of the sea field is calculated in the time domain.

[0019] The difference between the dynamic response of the superstructure without considering the nonlinear effect of the sea field and the dynamic response of the superstructure considering the full nonlinear effect of the sea field obtained by the direct coupling method can be considered as the effect of the full nonlinear effect of the sea field, i.e., the influence of the full nonlinear effect of the sea field can be quantitatively analyzed.

[0020] Further, in the calculation of the structural dynamic response considering the original nonlinear effect of the sea field, a dynamic time-history load is applied to the step-by-step coupling method model, and the dynamic response of the superstructure considering the original nonlinear effect of the sea field is calculated in the time domain.

[0021] The difference between the dynamic response of the superstructure considering the full nonlinear effect of the soil obtained by the direct coupling method and the dynamic response of the superstructure considering the original nonlinear effect of the soil obtained by the step-by-step coupling method is caused by the additional nonlinear effect of the sea field, i.e., the influence of the additional nonlinear effect of the sea field can be quantitatively analyzed.

[0022] Further, in the calculation of the structural dynamic response considering the original nonlinear effect of the sea field, a dynamic time-history load is applied to the step-by-step coupling method model, and the dynamic response of the superstructure considering the original nonlinear effect of the sea field is calculated in the time domain.

[0023] The upper structure numerical simulation module is used for realizing numerical simulation of the upper structure by establishing an upper structure model, and calculating structural dynamic response under ideal rigid foundation conditions without considering the nonlinear influence of the sea area site;

[0024] The numerical simulation module based on the direct coupling method is used for describing the sea area site soil by an elastic-plastic dynamic constitutive relation, directly constructing a full-coupling upper structure-foundation-ground overall system, realizing numerical simulation based on the direct coupling method, and calculating structural dynamic response under the influence of full nonlinear effects of the sea area site;

[0025] The numerical simulation module based on the step-by-step coupling method is used for calculating the dynamic response of a sea area site model without structure, calibrating equivalent linearized soil parameters based on the maximum shear strain level of each soil layer, defining the soil by using the calibrated values, constructing an upper structure-foundation-ground overall system, realizing numerical simulation based on the step-by-step coupling method, and calculating structural dynamic response under the influence of the original nonlinear effects of the sea area site;

[0026] The full nonlinear quantitative analysis module is used for quantitatively analyzing the influence of full nonlinearities of the sea area site by comparing and analyzing the structural dynamic response results of the upper structure model and the direct coupling method model;

[0027] The additional nonlinear quantitative analysis module is used for quantitatively analyzing the influence of additional nonlinearities of the sea area site by comparing and analyzing the structural dynamic response results of the direct coupling method model and the step-by-step coupling method model.

[0028] An electronic device comprises a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method for quantitatively analyzing full nonlinearities and additional nonlinearities of a sea area site under dynamic load action as described above.

[0029] A non-transitory computer readable storage medium has a computer program stored thereon, wherein the computer program is executable on a processor to implement the steps of the method for quantitatively analyzing full nonlinearities and additional nonlinearities of a sea area site under dynamic load action as described above.

[0030] The beneficial effects of the present application and the preferred schemes thereof at least include:

[0031] 1. The method is suitable for various offshore engineering structures, foundation forms and sites;

[0032] 2. The method proposes a modeling and calculation method of the distributed coupling model, which can realize quantitative analysis of additional nonlinearities of the site by differentiating and comparing the dynamic response of the overall coupling model;

[0033] 3. This method can achieve fully nonlinear quantitative analysis of the site by comparing the dynamic response differences between the superstructure model and the overall coupled model under ideal rigid foundation conditions.

[0034] 4. Through the quantitative analysis results of this method, the specific influences of primary nonlinearity, additional nonlinearity, and full nonlinearity on the dynamic response of the structure can be obtained, thereby clarifying the necessity or substitutability of the overall coupling analysis of soil and structure.

[0035] 5. Through the quantitative and proportional analysis of the effects of various nonlinearities using this method, a better option for efficient modeling of geotechnical design in marine engineering is provided, which greatly improves design efficiency and reduces computational costs. This is of great significance for simplifying engineering design schemes and processes and improving accuracy. Attached Figure Description

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0037] Figure 1 This is a flowchart of the quantitative analysis method for fully nonlinear and additional nonlinear marine sites according to an embodiment of the present invention.

[0038] Figure 2 A schematic diagram of the wind turbine-tower-suction pile jacket foundation-site system and model for a certain offshore wind farm project.

[0039] Figure 3 This is a flowchart illustrating the implementation method of the step-by-step coupling method in an embodiment of the present invention. Detailed Implementation

[0040] To make the features and advantages of this patent more apparent and understandable, specific embodiments are provided below, along with accompanying drawings, for detailed explanation:

[0041] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] like Figures 1-3As shown, the embodiment of the present application specifically introduces the design and construction of the quantification analysis method of the full nonlinearity and additional nonlinearity of the sea site under dynamic load, wherein the dynamic load refers to various dynamic loads or combined loads such as earthquakes, waves, and ocean currents, the full nonlinearity of the sea site includes the original nonlinearity of the sea site and the additional nonlinearity of the sea site, the original nonlinearity of the sea site refers to the nonlinearity of the stress-strain relationship of the soil under the action of dynamic load under the condition of the sea site (without structure), and the additional nonlinearity of the sea site refers to the additional nonlinearity of the soil material caused by the soil-structure interaction (SSI) effect of the soil and the structure under the action of dynamic load due to the existence of the structure above the sea bed surface and the foundation in the sea bed in the actual marine environment, and the specific process is as shown in Figure 1 As shown, in combination with a certain offshore wind farm project, the wind turbine, suction pile jacket foundation, site, etc. are specifically introduced (for specific structure system and model schematic, please refer to Figure 2 ), and the calculation and analysis specifically includes the following steps:

[0044] Step S1-1, numerical simulation of the upper structure: the upper structure refers to the structure and component above the sea bed and foundation, and in this specific implementation case, it specifically refers to the structure system of the wind turbine + tower + transition section + jacket structure, the numerical simulation is based on the finite element analysis method to establish a model, in order to reduce the influence of other material nonlinearities on the quantification analysis of the nonlinearity of the sea site, the material of the upper structure is simulated by using linear elastic constitutive model, and in addition, a fixed boundary is applied at the bottom of the upper structure to simulate the ideal rigid foundation condition;

[0045] Step S1-2, numerical simulation based on direct coupling method: a full coupling model of the wind turbine-tower-suction pile jacket foundation-nonlinear site system considering the SSI effect is constructed, the generalized non-Masing dynamic constitutive model is used to simulate the dynamic nonlinearity and hysteresis characteristics of the soil of the sea site, and a full coupling model of the wind turbine-tower-suction pile jacket foundation-site system is directly constructed;

[0046] Step S1-3, numerical simulation based on step-by-step coupling method: as shown in Figure 3 , the first step is to establish a site model only for the sea site (without the upper structure and foundation), the generalized non-Masing dynamic constitutive model is used to describe the dynamic nonlinearity and complex characteristics of the soil, the dynamic load is applied, the maximum shear strain level of each soil layer is calculated, and 0.65 times thereof is taken as the equivalent shear strain, and the corresponding values are marked on the stiffness parameter and damping parameter curves; the second step is to use the equivalent stiffness parameters and equivalent damping parameters compatible with the strain of the soil element marked in the first step as the input parameters of the viscoelastic soil, and a full coupling model of the wind turbine-tower-suction pile jacket foundation-site system is constructed;

[0047] Step S2-1, calculating the dynamic response of the upper structure: calculating the dynamic response of the structure without considering the nonlinear effect of the sea site under the ideal rigid foundation condition, constructing a model of the wind turbine-tower-conductor support system, and applying the corresponding dynamic load;

[0048] Step S2-2, calculating the dynamic response of the upper structure by the direct coupling method: applying the dynamic time-history load to the direct coupling method model, and calculating the dynamic response of the upper structure considering the full nonlinear effect of the sea site in the time domain;

[0049] Step S2-3, calculating the dynamic response of the upper structure by the step-by-step coupling method: applying the dynamic time-history load to the step-by-step coupling method model, and calculating the dynamic response of the upper structure considering the original nonlinear effect of the sea site in the time domain;

[0050] Step S3-1, quantifying the influence of the full nonlinear effect of the sea site: comparing and analyzing the difference between step S2-1 (the dynamic response of the upper structure without considering the nonlinear effect of the sea site) and step S2-2 (the dynamic response of the upper structure in the SSI system considering the full nonlinear effect of the sea site by the direct coupling method), which can be considered as the influence of the full nonlinear effect of the sea site, and thus the influence of the full nonlinear effect of the sea site can be quantitatively analyzed;

[0051] Step S3-2, quantifying the influence of the additional nonlinear effect of the sea site: comparing and analyzing the difference between the dynamic response of the structure in step S2-2 (the dynamic response of the upper structure in the SSI system considering the full nonlinear effect of the sea site by the direct coupling method) and step S2-3 (the dynamic response of the upper structure in the SSI system considering the original nonlinear effect of the sea site by the step-by-step coupling method), which is caused by the additional nonlinear effect of the sea site, and thus the influence of the additional nonlinear effect of the sea site can be quantitatively analyzed;

[0052] Therefore, the application establishes a quantitative analysis method for the full nonlinear effect and the additional nonlinear effect of the sea site under the action of the dynamic load, the differences of the dynamic responses of the three models in the time domain are compared and analyzed by establishing the sea site model (without structure), the direct coupling method model and the step-by-step coupling method model, the method for quantitatively analyzing the full nonlinear effect and the additional nonlinear effect of the sea soil under the action of the dynamic load has the advantages of strong operability, high accuracy and high efficiency.

[0053] Those skilled in the art will understand that embodiments of the application can be provided as methods, systems, or computer program products. Therefore, the application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) containing computer-usable program code.

[0054] The present application is described with reference to the drawings in which implementation examples of the application are shown. The drawings described are intended to be illustrative, and not restrictive. Although the application has been described herein with reference to particular structures, acts, and materials, it is not intended that the application be limited to the particulars disclosed herein. Changes can be made in the methods described and in the structures described without departing from the spirit and scope of the application. It is therefore intended to cover within the ambit of the application all such changes and modifications that can be made in the methods described and in the structures described without departing from the spirit and scope of the application. The application has been described with reference to particular means, materials, and acts, but equivalent means, materials, and acts can be used without departing from the spirit and scope of the application. The foregoing description discloses only exemplary embodiments of the application. Modifications of the exemplary embodiments as well as other embodiments of the application will be obvious to those with skill in the art in view of the foregoing description. Moreover, the order in which the steps of the methods are presented is not intended to be limiting unless otherwise indicated. Accordingly, the application is not limited to the specific embodiments described in the specification, but is intended to cover any method consistent with the principles of the application. The application is described with reference to the flowchart illustrations and / or block diagrams according to the methods, devices (systems), and computer program products of the present application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart or block diagram. Figure 1 one or more functions specified in the flowchart or block diagram.

[0055] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart or block diagram. Figure 1 one or more functions specified in the flowchart or block diagram.

[0056] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart or block diagram. Figure 1 one or more functions specified in the flowchart or block diagram.

[0057] It should be noted that unless otherwise defined, technical and scientific terms used in the present application shall have the meanings that are commonly understood by one of ordinary skill in the art to which this application pertains. The terms "first", "second", and similar rela¬tive expressions used herein are used to distinguish one element from another, but do not imply any required order, quantity, or importance. The terms "comprising", "comprise", and the like con¬note the inclusion of a recited element or a group of elements but not preclude the addition of other elements or groups of elements. The terms "connected" and "coupled" and the like, as used herein, are intended to be interpreted broadly to encompass a connection or coupling between two members, whether direct or indirect, that is capable of transmitting signals between the members, electrically or otherwise. The terms "upper", "lower", "left", "right", and the like are used herein only to denote relative positions for the purpose of illustration and can be reversed when the positions of the described objects are changed.

[0058] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in other forms. Any person skilled in the art can make changes or modifications to equivalent embodiments using the disclosed technical content. However, any simple modification, equivalent change, and modification of the above embodiments without departing from the technical solution of the present application, and according to the technical essence of the present application, still belongs to the protection scope of the technical solution of the present application.

[0059] The present patent is not limited to the above best mode, and anyone can derive other various forms of a quantitative analysis method of full nonlinearity and additional nonlinearity of a sea area under a dynamic load action under the inspiration of the present patent. Any equivalent change and modification made within the scope of the present application should be covered by the present patent.

Claims

1. A method for quantitatively analyzing full nonlinearity and additional nonlinearity of a sea area site under dynamic load, characterized in that: a numerical simulation of an upper structure is realized by establishing a model of the upper structure; on this basis, a structural dynamic response is calculated without considering the influence of nonlinearity of the sea area site under an ideal rigid foundation condition; the upper structure includes a seabed and structures and components above the foundation, a model is established based on a finite element analysis method, a linear elastic constitutive model is used for the material of the upper structure, and a fixed boundary is applied at the bottom of the upper structure to simulate the ideal rigid foundation condition; a soil body of the sea area site is described by an elastoplastic dynamic constitutive model, a full-coupled overall system of the upper structure-foundation-ground is directly constructed to realize numerical simulation based on a direct coupling method; on this basis, a structural dynamic response is calculated considering the influence of full nonlinearity of the sea area site; when the numerical simulation based on the direct coupling method is realized, a full-coupled system model of the upper structure-foundation-flexible ground considering SSI effect is constructed, and the dynamic nonlinearity and complex characteristics of the soil material of the sea area site are described by an elastoplastic constitutive model; a dynamic response of a sea area site model without structure is calculated, equivalent linearized soil parameters are calibrated based on the maximum shear strain level of each soil layer; then the calibrated soil is defined to construct an overall system of the upper structure-foundation-ground, and numerical simulation based on a step-by-step coupling method is realized; on this basis, a structural dynamic response is calculated considering the influence of original nonlinearity of the sea area site; in the process of realizing the numerical simulation based on the step-by-step coupling method, first, a site model is established only for the sea area site without the upper structure and the foundation, the dynamic nonlinearity and complex characteristics of the soil are described by an elastoplastic constitutive model, a dynamic load is applied, the maximum shear strain level of each soil layer is calculated, and 0.65 times the maximum shear strain level is taken as the equivalent shear strain to calibrate the corresponding values on the stiffness parameter and damping parameter curves; then the calibrated equivalent stiffness parameters and equivalent damping parameters compatible with the strain of the soil element are used as the input parameters of the viscoelastic soil to construct an overall system of the upper structure-foundation-ground; the influence of full nonlinearity of the sea area site is quantitatively analyzed by comparing and analyzing the structural dynamic response results of the upper structure model and the direct coupling method model; the influence of additional nonlinearity of the sea area site is quantitatively analyzed by comparing and analyzing the structural dynamic response results of the direct coupling method model and the step-by-step coupling method model. when the structural dynamic response is calculated without considering the influence of nonlinearity of the sea area site under the ideal rigid foundation condition, a dynamic time-history load is applied to the upper structure model, and the dynamic response of the upper structure without considering the influence of nonlinearity of the sea area site is calculated in the time domain. when the structural dynamic response is calculated considering the influence of full nonlinearity of the sea area site, a dynamic time-history load is applied to the direct coupling method model, and the dynamic response of the upper structure considering the influence of full nonlinearity of the sea area site is calculated in the time domain. when the structural dynamic response is calculated considering the influence of original nonlinearity of the sea area site, a dynamic time-history load is applied to the step-by-step coupling method model, and the dynamic response of the upper structure considering the influence of original nonlinearity of the sea area site is calculated in the time domain.

2. The method according to claim 1, wherein the method is characterized by: It comprises:

3. The method according to claim 1, wherein the method is characterized by: ​ 4. The method according to claim 1, wherein the method is characterized by: ​ 5. A system for quantitatively analyzing full nonlinearity and additional nonlinearity of a site in a sea area under a dynamic load, for implementing the method according to claim 1, characterized by, ​ The upper structure numerical simulation module is used for realizing numerical simulation of the upper structure by establishing a model of the upper structure, and calculating structural dynamic response under ideal rigid foundation conditions without considering the nonlinear influence of the sea area site; The numerical simulation module based on the direct coupling method is used for describing the sea area site soil by an elastic-plastic dynamic constitutive relation, directly constructing a full-coupling overall system of the upper structure-foundation-ground, realizing numerical simulation based on the direct coupling method, and calculating structural dynamic response considering the full nonlinear effect of the sea area site; The numerical simulation module based on the step-by-step coupling method is used for calculating dynamic response of a sea area site model without structure, and marking equivalent linearized soil parameters based on the maximum shear strain level of each soil layer; Then, the calibrated values are used to define the soil, construct an overall system of the upper structure-foundation-ground, realize numerical simulation based on the step-by-step coupling method, and calculate structural dynamic response considering the original nonlinear effect of the sea area site; The full nonlinear quantitative analysis module is used for quantitatively analyzing the influence of the full nonlinear of the sea area site by comparing and analyzing structural dynamic response results of the upper structure model and the direct coupling method model; The additional nonlinear quantitative analysis module is used for quantitatively analyzing the influence of the additional nonlinear of the sea area site by comparing and analyzing structural dynamic response results of the direct coupling method model and the step-by-step coupling method model.

6. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to realize the steps of the method for quantitatively analyzing the full nonlinear and the additional nonlinear of the sea area site under dynamic load according to any one of claims 1-4. 7.A non-transitory computer-readable storage medium having stored thereon a computer program. The computer program is executed by the processor to realize the steps of the method for quantitatively analyzing the full nonlinear and the additional nonlinear of the sea area site under dynamic load according to any one of claims 1-4.

Images