A method for determining the strength of a pipe frame foundation and a related device

Abstract

The present application discloses a strength determination method and related device for a jacket foundation, which first roughly divides the jacket foundation model based on a larger first size, and calculates the stress conditions of the jacket foundation grid model under various simulation conditions, and then selects the target area where problems may exist, and finally finely divides the regional sub-model corresponding to the target area based on a smaller second size, and calculates the stress conditions of the target area where problems may exist, and then determines the stress-strain information of the regional grid model, so as to analyze the strength of the area corresponding to the regional grid model based on the stress-strain information. Therefore, it is not necessary to consider fine modeling of each area of ​​the jacket foundation model, but only fine modeling is performed for the target area where problems may exist, which shortens the force solution time of the jacket foundation, and further shortens the time to determine the strength of the jacket foundation.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a method for determining the strength of a conductor frame foundation and a related device. Background Art

[0002] Jacket foundation refers to a basic structure form of offshore wind power, which is mostly used in offshore areas with a water depth of more than 40m. As an important component of the offshore support structure, the jacket foundation has to withstand various complex dynamic loads during the operation of the wind turbine during its design life. On the other hand, its complex welding structure, especially the welds, makes it more susceptible to damage. Therefore, the safety of the jacket foundation is one of the important aspects of the safety of the offshore support structure.

[0003] In the related art, since the number of units and nodes included in the jacket foundation is too large, it takes too long to solve the force of the jacket foundation, and thus it takes too long to determine the strength of the jacket foundation. Summary of the invention

[0004] In view of the above problems, the present application provides a method for determining the strength of a jacket foundation and a related device, which are used to shorten the time for determining the strength of the jacket foundation.

[0005] Based on this, the embodiments of the present application disclose the following technical solutions:

[0006] On the one hand, an embodiment of the present application provides a method for determining the strength of a jacket foundation, the method comprising:

[0007] Obtain the basic model of the jacket and various simulation conditions;

[0008] Based on a first size, dividing the jacket basic model into a plurality of grids to obtain a jacket basic grid model, wherein the first size is greater than a preset threshold;

[0009] Respectively determining the stress conditions of the conductor frame foundation grid model under the multiple simulation conditions, and obtaining a plurality of first stress results corresponding to a plurality of regions included in the conductor foundation model;

[0010] From the plurality of first force results, determine an area corresponding to a first force result greater than a first preset force threshold as a target area;

[0011] Establishing a regional sub-model for the target area, dividing the regional sub-model into a plurality of grids based on a second size to obtain a regional grid model, wherein the second size is smaller than the first size;

[0012] Respectively determining the stress conditions of the regional grid model under the multiple simulation conditions, and obtaining a plurality of second stress results respectively corresponding to the regional grid model;

[0013] The stress and strain information of the regional mesh model is determined according to the plurality of second force results.

[0014] Optionally, the tower bottom of the jacket foundation model has a load parachute, and the load parachute is used to evenly distribute the point load on the jacket foundation model; the method further includes:

[0015] A plurality of first local coordinate systems are established at the center of the payload parachute, wherein the first local coordinate system includes three mutually perpendicular coordinate axes, and different coordinate axes represent the forces of the payload parachute in different directions. Other first local coordinate systems are obtained by rotating the target first local coordinate system based on the target axis. The target first local coordinate system is one of the plurality of first local coordinate systems, and the other first local coordinate systems are first local coordinate systems other than the target first local coordinate system in the plurality of first coordinate systems, and the target axis is one of the three coordinate axes.

[0016] The multiple simulation working conditions are obtained according to the multiple first local coordinate systems and the multiple preset working conditions. The simulation working conditions are used to describe the stress conditions of the jacket foundation model in different angles and directions under the different preset working conditions.

[0017] Optionally, obtaining the multiple simulation working conditions according to the multiple first local coordinate systems and the multiple preset working conditions includes:

[0018] Applying unit force or unit moment to different coordinate axes included in each of the first local coordinate systems to obtain multiple unit working conditions, wherein the simulation working conditions include the unit working conditions; or,

[0019] A plurality of limit loads are applied to different coordinate axes included in each of the first local coordinate systems to obtain a plurality of combined working conditions, the simulated working conditions include the combined working conditions, and the limit loads are loads corresponding to actual limit working conditions.

[0020] Optionally, if the simulated operating condition includes the combined operating condition, the method further includes:

[0021] Respectively determining various stress conditions of the jacket frame basic grid model under the various unit working conditions, and respectively obtaining various first displacement boundary information of the jacket frame basic grid model under the various unit working conditions, wherein the first displacement boundary information is used to describe the deformation of the jacket frame basic grid model after being subjected to stress;

[0022] The respectively determining the stress conditions of the regional grid model under the multiple simulation conditions to obtain a plurality of second stress results respectively corresponding to the regional grid model includes:

[0023] Determining first displacement boundary information corresponding to the target area from the multiple types of first displacement boundary information;

[0024] Determining second displacement boundary information corresponding to the regional grid model according to the regional grid model and the first displacement boundary information corresponding to the target area;

[0025] According to the second displacement boundary information corresponding to the regional grid model, the stress conditions of the regional grid model under the multiple combined working conditions are determined respectively, and a plurality of second stress results respectively corresponding to the regional grid model are obtained.

[0026] Optionally, if the simulation working condition includes the unit working condition, then respectively determining the stress conditions of the regional grid model under the multiple simulation working conditions to obtain multiple second stress results respectively corresponding to the regional grid model includes:

[0027] Establishing a second local coordinate system at the weld toe position of the regional grid model, the second local coordinate system comprising a first coordinate axis, a second coordinate axis and a third coordinate axis, the first coordinate axis is parallel to the weld, the second coordinate axis is perpendicular to the weld, and the third coordinate axis is perpendicular to the first coordinate axis and the second coordinate axis;

[0028] According to the multiple unit working conditions, multiple stress components of the regional grid model in the three coordinate axis directions in the second local coordinate system are determined, and the stress components are the second force results.

[0029] Optionally, determining, according to the multiple unit working conditions, multiple stress components of the regional grid model in three coordinate axis directions in the second local coordinate system includes:

[0030] Determining the type of welds included in the regional grid model according to welding specifications;

[0031] According to the type of the weld, extracting an extrapolated reference point corresponding to the weld;

[0032] According to the extrapolated reference point corresponding to the weld and the multiple unit working conditions, multiple stress components in the three coordinate axis directions of the regional grid model in the second local coordinate system are determined.

[0033] Optionally, the method further includes:

[0034] If the simulated working condition includes the combined working condition, a preset strength threshold corresponding to the target area is obtained, and if the stress-strain information is greater than the preset strength threshold, the target area is a dangerous area;

[0035] If the simulated working condition includes the unit working condition, a stress-life SN curve is obtained, and the fatigue strength of the weld is determined according to the stress-strain information and the SN curve, and the SN curve is used to characterize the relationship between fatigue strength and fatigue life.

[0036] Optionally, establishing a regional sub-model for the target area, dividing the regional sub-model into a plurality of grids based on the second size to obtain a regional grid model, includes:

[0037] Establishing a regional sub-model for the target area, and determining a key area of ​​the regional sub-model based on welding specifications;

[0038] Based on the third size, the key area is divided into multiple grids, and based on the second size, other areas are divided into multiple grids to obtain the regional grid model, the third size is smaller than the second size, and the other areas are areas in the regional sub-model except the key area.

[0039] On the other hand, the present application provides a strength determination device for a jacket foundation, the device comprising: an acquisition unit, a division unit, a determination unit, and a screening unit;

[0040] The acquisition unit is used to acquire the jacket basic model and multiple simulation conditions;

[0041] The division unit is used to divide the jacket basic model into a plurality of grids based on a first size to obtain a jacket basic grid model, wherein the first size is greater than a preset threshold;

[0042] The determining unit is used to respectively determine the stress conditions of the conductor frame basic grid model under the multiple simulation conditions, and obtain multiple first stress results corresponding to multiple regions included in the conductor basic model;

[0043] The screening unit is used to determine, from the plurality of first force results, an area corresponding to a first force result greater than a first preset force threshold as a target area;

[0044] The division unit is further used to establish a regional sub-model for the target area, and divide the regional sub-model into a plurality of grids based on a second size to obtain a regional grid model, wherein the second size is smaller than the first size;

[0045] The determination unit is further used to respectively determine the stress conditions of the regional grid model under the multiple simulation conditions, and obtain multiple second stress results corresponding to the regional grid model respectively;

[0046] The determining unit is further used to determine the stress-strain information of the regional grid model according to the multiple second force results.

[0047] Optionally, the tower bottom of the jacket foundation model has a load parachute, and the load parachute is used to evenly distribute the point load on the jacket foundation model; the device also includes a simulation condition determination unit, which is used to:

[0048] A plurality of first local coordinate systems are established at the center of the payload parachute, wherein the first local coordinate system includes three mutually perpendicular coordinate axes, and different coordinate axes represent the forces of the payload parachute in different directions. Other first local coordinate systems are obtained by rotating the target first local coordinate system based on the target axis. The target first local coordinate system is one of the plurality of first local coordinate systems, and the other first local coordinate systems are first local coordinate systems other than the target first local coordinate system in the plurality of first coordinate systems, and the target axis is one of the three coordinate axes.

[0049] The multiple simulation working conditions are obtained according to the multiple first local coordinate systems and the multiple preset working conditions. The simulation working conditions are used to describe the stress conditions of the jacket foundation model in different angles and directions under the different preset working conditions.

[0050] Optionally, the device further comprises a simulated operating condition determination unit, configured to:

[0051] Applying unit force or unit moment to different coordinate axes included in each of the first local coordinate systems to obtain multiple unit working conditions, wherein the simulation working conditions include the unit working conditions; or,

[0052] A plurality of limit loads are applied to different coordinate axes included in each of the first local coordinate systems to obtain a plurality of combined working conditions, the simulated working conditions include the combined working conditions, and the limit loads are loads corresponding to actual limit working conditions.

[0053] Optionally, if the simulated operating condition includes the combined operating condition, the determining unit is further used to:

[0054] Respectively determining various stress conditions of the jacket basic grid model under the various unit working conditions, and respectively obtaining various first displacement boundary information of the jacket basic grid model under the various unit working conditions, wherein the displacement boundary information is used to describe the deformation of the jacket basic grid model after being subjected to stress;

[0055] Determining first displacement boundary information corresponding to the regional grid model from the multiple types of first displacement boundary information;

[0056] Determining second displacement boundary information corresponding to the regional grid model according to the regional grid model and first displacement boundary information corresponding to the regional grid model;

[0057] According to the second displacement boundary information corresponding to the regional grid model, the stress conditions of the regional grid model under the multiple combined working conditions are determined respectively, and a plurality of second stress results respectively corresponding to the regional grid model are obtained.

[0058] Optionally, if the simulated operating condition includes the unit operating condition, the determining unit is further used to:

[0059] Establishing a second local coordinate system at the weld toe position of the regional grid model, the second local coordinate system comprising a first coordinate axis, a second coordinate axis and a third coordinate axis, the first coordinate axis is parallel to the weld, the second coordinate axis is perpendicular to the weld, and the third coordinate axis is perpendicular to the first coordinate axis and the second coordinate axis;

[0060] According to the multiple unit working conditions, multiple stress components of the regional grid model in the three coordinate axis directions in the second local coordinate system are determined, and the stress components are the second force results.

[0061] Optionally, the device further includes a judging unit, configured to:

[0062] If the simulated working condition includes the combined working condition, a preset strength threshold corresponding to the target area is obtained, and if the stress-strain information is greater than the preset strength threshold, the target area is a dangerous area;

[0063] If the simulated working condition includes the unit working condition, a stress-life SN curve is obtained, and the fatigue strength of the weld is determined according to the stress-strain information and the SN curve, and the SN curve is used to characterize the relationship between fatigue strength and fatigue life.

[0064] Optionally, the determining unit is specifically configured to:

[0065] Determining the type of welds included in the regional grid model according to welding specifications;

[0066] According to the type of the weld, extracting an extrapolated reference point corresponding to the weld;

[0067] According to the extrapolated reference point corresponding to the weld and the multiple unit working conditions, multiple stress components in the three coordinate axis directions of the regional grid model in the second local coordinate system are determined.

[0068] Optionally, the division unit is specifically used to:

[0069] Establishing a regional sub-model for the target area, and determining a key area of ​​the regional sub-model based on welding specifications;

[0070] Based on the third size, the key area is divided into multiple grids, and based on the second size, other areas are divided into multiple grids to obtain the regional grid model, the third size is smaller than the second size, and the other areas are areas in the regional sub-model except the key area.

[0071] In another aspect, the present application provides a computer device, the device comprising a processor and a memory:

[0072] The memory is used to store program code and transmit the program code to the processor;

[0073] The processor is used to execute the method described in the above aspects according to the instructions in the program code.

[0074] On the other hand, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store a computer program, and the computer program is used to execute the method described in the above aspects.

[0075] On the other hand, an embodiment of the present application provides a computer program product or a computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method described in the above aspects.

[0076] The advantages of the above technical solution of this application are:

[0077] After obtaining the jacket foundation model and multiple simulation conditions, the jacket foundation model is divided into multiple grids based on a first size greater than a preset threshold, that is, based on a larger size, to obtain a jacket foundation grid model, and the stress conditions of the jacket foundation grid model under multiple simulation conditions are determined respectively, and multiple first stress results corresponding to multiple regions included in the jacket foundation model are obtained. From the multiple first stress results, the region corresponding to the first stress result greater than the first preset stress threshold is determined as the target expectation. The stress of the target region may be large, which may be a region with problems in the jacket foundation. In order to improve the accuracy of the target region analysis, a regional sub-model is established for the target region, and the regional sub-model is divided into multiple grids based on a second size less than the first size, that is, based on a smaller size, to obtain a regional grid model, and the stress conditions of the regional grid model under multiple simulation conditions are determined respectively, and multiple second stress results corresponding to the regional grid model are obtained. Then, based on the multiple second stress results, the stress-strain information of the regional grid model is determined, so as to analyze the strength of the region corresponding to the regional grid model based on the stress-strain information.

[0078] Therefore, the stress condition of the jacket foundation model is roughly calculated based on a larger size, and then the target area where problems may occur is screened out. Finally, the stress condition of the target area where problems may occur is finely calculated based on a smaller size. Therefore, there is no need to consider fine modeling of each area of ​​the jacket foundation model, but only fine modeling is performed on the target area where problems may occur, which shortens the time for solving the stress of the jacket foundation, and further shortens the time for determining the strength of the jacket foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0080] Figure 1 A flow chart of a method for determining the strength of a jacket foundation provided in an embodiment of the present application;

[0081] Figure 2 A schematic diagram of a strength determination device for a jacket foundation provided in an embodiment of the present application;

[0082] Figure 3 A structural diagram of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0083] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0084] The jacket foundation usually consists of a jacket, a transition section and piles. The piles are welded twice with a diameter of about 2m-3m and driven into the seabed in advance. The jacket is a steel truss structure welded from large-diameter low-alloy steel pipes. The jacket consists of main legs and cross braces. The main legs can be a three-leg tower jacket or a four-leg tower jacket. The main legs of the jacket are connected by horizontal cross braces and diagonal braces to transfer the load and strengthen the jacket. The transition section is a box beam structure located above the jacket and serves to connect the tower and the jacket.

[0085] Taking the transition section as an example, as an important component of the offshore support structure, the transition section of the jacket foundation has to withstand various complex dynamic loads during the operation of the wind turbine during its 25-year design life. On the other hand, its complex welding structure, especially the welds, makes it more susceptible to damage. Therefore, the safety of the transition section of the jacket foundation is one of the important aspects of the safety of the offshore support structure.

[0086] In the related art, since the jacket foundation (such as transition sections and other structures) includes too many units and nodes, it is necessary to perform detailed modeling on the jacket foundation model. For example, the jacket foundation model is divided into multiple grids based on a finer size, and then the stress condition of each grid under each working condition is analyzed. Finally, the stress condition of the jacket foundation model is solved by combining the stress conditions of multiple grids. This results in a long time for solving the force of the jacket foundation model, and thus a long time for determining the strength of the jacket foundation.

[0087] Based on this, an embodiment of the present application provides a strength determination method and related device for a conductor rack foundation, which first roughly calculates the stress condition of the conductor rack foundation model based on a larger size, then screens out the target area where problems may exist, and finally finely calculates the stress condition of the target area where problems may exist based on a smaller size. Therefore, there is no need to consider fine modeling of each area of ​​the conductor rack foundation model, but only fine modeling is performed on the target area where problems may exist, thereby shortening the force solution time of the conductor rack foundation, and thereby shortening the time for determining the strength of the conductor rack foundation.

[0088] Combine the following Figure 1 , a method for determining the strength of a jacket foundation provided in an embodiment of the present application is introduced. Figure 1 , this figure is a flow chart of a method for determining the strength of a jacket foundation provided in an embodiment of the present application, and the method may include S101-S107.

[0089] S101: Obtain a basic model of the jacket and various simulation conditions.

[0090] The jacket foundation model is a model established for the jacket foundation, such as a jacket foundation model established by computer aided design (CAD) software, and the jacket foundation model includes a transition section, a jacket foundation, and a geometric model of a tower.

[0091] As a possible implementation method, taking the study of the transition section in the jacket foundation as an example, the established geometric model does not need to include all the jacket foundations and towers, but only needs part of the jacket foundation and part of the tower connected to the transition section to achieve load transfer, that is, the jacket foundation model includes the transition section, part of the jacket foundation and part of the tower, thereby reducing the complexity of model establishment without affecting the subsequent accuracy.

[0092] S102: Based on the first size, the jacket basic model is divided into a plurality of grids to obtain a jacket basic grid model.

[0093] The first size is greater than a preset threshold, or the first size is a relatively large size. The jacket basic model is divided into a plurality of grids based on the first size to obtain a jacket basic grid model, the jacket basic grid model includes a plurality of grids, each grid is obtained based on the first size, and each grid has a relatively large size.

[0094] It is understandable that the smaller the first size is, the higher the accuracy of the stress condition of the jacket foundation grid model under the simulated working condition is, but the more time is spent on entity segmentation, and due to the large number of grids, the solution time is very long, which is not conducive to the rapid delivery of engineering results. Based on this, in the embodiment of the present application, the first size is controlled to be a larger size, which will not be very small, so that the jacket foundation model is roughly divided by a large size, which not only shortens the time spent on the entity segmentation step by increasing the size of the grid, but also shortens the solution time by reducing the number of grids.

[0095] For example, the jacket foundation model established by the CAD software can be divided into coarse grids by finite element software, and the grid division process can be performed automatically without special control.

[0096] S103: respectively determining stress conditions of the conductor rack foundation grid model under a plurality of simulation conditions, and obtaining a plurality of first stress results respectively corresponding to a plurality of regions included in the conductor rack foundation model.

[0097] The simulated working condition is to simulate the actual situation of the jacket foundation, so that the stress condition of the jacket foundation model under the simulated working condition can simulate the working state of the jacket foundation under the actual situation.

[0098] By dividing the jacket foundation model into multiple grids, the effect of discretizing the solid model is achieved, tens of thousands of nodes are obtained, and then numerical calculations are performed on each node, that is, tens of thousands of differential equations are calculated, and then repeated iterations are performed to obtain an acceptable "accurate value", that is, the calculation result, so as to determine the stress condition of the jacket foundation grid model under the simulated working condition, and obtain multiple first stress results corresponding to multiple regions included in the jacket foundation model. Among them, the jacket foundation includes multiple structures, each of which can be a region included in the jacket foundation model.

[0099] It can be understood that both the jacket foundation grid model and the jacket foundation model are models established for the jacket foundation, and both can describe various areas included in the jacket foundation. The jacket foundation grid model is more suitable for calculating the force on the jacket foundation.

[0100] S104: From the plurality of first force results, determine an area corresponding to a first force result greater than a first preset force threshold as a target area.

[0101] The jacket foundation includes multiple structures, and different regions of the jacket foundation may be subjected to different forces due to different materials, welding processes, etc. Therefore, from multiple first force results, the region corresponding to the first force result greater than the first preset force threshold can be determined as the target region, and the force on the target region may be greater, which may cause the risk of damage.

[0102] Therefore, based on the first preset stress threshold, the target area where the stress may be greater can be quickly screened out, that is, the area where there may be problems in the jacket foundation.

[0103] S105: establishing a regional sub-model for the target region, and dividing the regional sub-model into a plurality of grids based on the second size to obtain a regional grid model.

[0104] Since the jacket foundation grid model is obtained based on the larger first size, the force results for the target area obtained based on the jacket foundation grid model may be inaccurate, but the error is acceptable. Therefore, a regional sub-model can be established for the target area, and the regional sub-model can be divided into multiple grids based on the second size to obtain a regional grid model. The second size is smaller than the first size, that is, the regional sub-model is divided into multiple grids based on the smaller size to obtain a regional grid model, so that the force situation can be analyzed in detail later, and the accuracy of the target area analysis can be improved.

[0105] Although the second size is smaller, since the regional sub-model is smaller, it will not spend too much time on entity segmentation, and the number of grids will not be large, the solution time will be short, and it will not cause problems that are not conducive to the rapid delivery of engineering results.

[0106] S106: respectively determining the stress conditions of the regional grid model under a plurality of simulation conditions, and obtaining a plurality of second stress results respectively corresponding to the regional grid models.

[0107] Therefore, by finely dividing the regional sub-models in small sizes, the stress conditions of the target area can be analyzed in detail, that is, the stress conditions of the regional grid model under various simulation conditions can be determined respectively, and multiple second stress results corresponding to the regional grid model can be obtained, thereby determining the stress-strain information of the regional grid model based on the multiple second stress results.

[0108] S107: Determine stress and strain information of the regional grid model according to the plurality of second force results.

[0109] It can be seen from the above technical solution that after obtaining the jacket foundation model and multiple simulation conditions, the jacket foundation model is divided into multiple grids based on a first size greater than a preset threshold, that is, based on a larger size, to obtain a jacket foundation grid model, and the stress conditions of the jacket foundation grid model under multiple simulation conditions are determined respectively, and multiple first stress results corresponding to multiple regions included in the jacket foundation model are obtained. From the multiple first stress results, the region corresponding to the first stress result greater than the first preset stress threshold is determined as the target expectation. The stress of the target region may be large, which may be a region with problems in the jacket foundation. In order to improve the accuracy of the target region analysis, a regional sub-model is established for the target region, and the regional sub-model is divided into multiple grids based on a second size less than the first size, that is, based on a smaller size, to obtain a regional grid model, and the stress conditions of the regional grid model under multiple simulation conditions are determined respectively, and multiple second stress results corresponding to the regional grid model are obtained. Then, based on the multiple second stress results, the stress-strain information of the regional grid model is determined, so as to analyze the strength of the region corresponding to the regional grid model based on the stress-strain information.

[0110] Therefore, the stress condition of the jacket foundation model is roughly calculated based on a larger size, and then the target area where problems may occur is screened out. Finally, the stress condition of the target area where problems may occur is finely calculated based on a smaller size. Therefore, there is no need to consider fine modeling of each area of ​​the jacket foundation model, but only fine modeling is performed on the target area where problems may occur, which shortens the time for solving the stress of the jacket foundation, and further shortens the time for determining the strength of the jacket foundation.

[0111] As a possible implementation method, the simulated working condition is to simulate the actual working condition of the jacket foundation. Since the real environment is complex and changeable, if a simulated working condition is established for each real environment, the workload is large. Based on this, the embodiment of the present application sets a variety of preset working conditions based on a variety of real environments, and obtains the required simulated working conditions through different combinations of one or more preset working conditions. The following is a detailed description.

[0112] First, a load parachute can be established at the bottom of the jacket foundation model. The load parachute is used to evenly distribute the point load on the jacket foundation model to achieve load transfer. Then, multiple first local coordinate systems are established at the center of the load parachute. According to the multiple first local coordinate systems and multiple preset working conditions, multiple simulation working conditions are obtained. The simulation working conditions are used to describe the stress conditions of the jacket foundation model at different angles and directions under different preset working conditions.

[0113] Among them, the first local coordinate system includes three mutually perpendicular coordinate axes, and different coordinate axes represent the forces of the payload parachute in different directions, such as the x-axis, y-axis and z-axis included in the spatial rectangular coordinate system. The first local coordinate system includes the target first local coordinate system and other first local coordinate systems. The target first local coordinate system is one of the multiple first local coordinate systems, and the other first local coordinate systems are the first local coordinate systems other than the target first local coordinate system among the multiple first local coordinate systems. Moreover, the other first local coordinate systems are obtained by rotating the target first local coordinate system based on the target axis, and the target axis is one of the three coordinate axes. For example, the other first local coordinate systems are obtained by rotating the target first local coordinate system based on the z-axis.

[0114] The embodiment of the present application does not specifically limit the number of the first local coordinate systems, and those skilled in the art can set it according to actual needs. It is understandable that the more the number of the first local coordinate systems, the higher the subsequent solution accuracy and the longer the calculation time. As a possible implementation method, it has been found through research that when the number of the first local coordinate systems is 7, the solution accuracy and the calculation time can be balanced. Continuing to take the transition section as an example, since the transition section is a symmetrical structure, 7 first local coordinate systems are established at the center of the load parachute, namely 0°, 15°, 30°, 45°, 60°, 75° and 90°, respectively. For example, the 0° coordinate system is used as the target first local coordinate system, and the remaining first local coordinate systems are other first local coordinate systems. The 15° coordinate system is based on the z-axis and is obtained by rotating the 0° coordinate system by 15°. The z-axis direction of the coordinate system is consistent with the direction of the coordinate system in the load simulation software (such as Bladed).

[0115] The preset working condition is a pre-set general working condition, which is not specifically limited in the embodiments of the present application, and can be set by those skilled in the art according to actual needs. The following two cases are used as examples for explanation.

[0116] Case 1: If the simulation working condition includes a unit working condition, a unit force or a unit moment is applied to different coordinate axes included in each first local coordinate system to obtain a plurality of unit working conditions, wherein the unit force or the unit moment is a preset working condition.

[0117] For example, taking one of the seven first local coordinate systems as an example, six unit loads are applied to the first local coordinate system, namely, applying a unit force to the x-axis, which can be expressed as Fx=1kN, applying a unit force to the y-axis, which can be expressed as Fy=1kN, applying a unit force to the z-axis, which can be expressed as Fz=1kN, applying a unit moment to the x-axis, which can be expressed as Mx=1kNm, applying a unit moment to the y-axis, which can be expressed as My=1kNm, and applying a unit moment to the z-axis, which can be expressed as Mz=1kNm. Thus, 7×6=42 unit working conditions are established.

[0118] Case 2: If the simulated working condition includes a combined working condition, multiple extreme loads are applied to different coordinate axes included in each first local coordinate system to obtain multiple combined working conditions, among which the preset working condition is the working condition composed of the extreme load, and the extreme load is the load corresponding to the actual extreme working condition.

[0119] For example, taking the 12 kinds of limit loads included in the Bladed software as an example, a variety of limit loads are applied to different coordinate axes included in each first local coordinate system, and 7×12=84 combined working conditions are obtained.

[0120] As can be seen from the foregoing, the target area may be subjected to greater force, and it may be an area where problems exist in the jacket foundation. The target area under fatigue conditions and the target area under extreme conditions are respectively described below as examples.

[0121] Case 2: Target area under extreme working conditions.

[0122] The extreme working condition refers to the simulation working condition including the aforementioned combined working condition. For example, after obtaining 84 combined working conditions, the stress conditions of the jacket foundation grid model under the 84 combined working conditions are determined respectively, and multiple first stress results corresponding to multiple areas included in the jacket foundation model are obtained. From the multiple first stress results, the area corresponding to the first stress result greater than the first preset stress threshold is determined as the target area, and the target area is the area that is prone to problems under the extreme working condition.

[0123] A regional sub-model is established for the target area. As a possible implementation method, the mesh of the regional sub-model established for the extreme working condition can be precisely controlled, and the mesh of the area where danger may occur can be processed according to the specification rules. Based on the second size, the regional sub-model is divided into multiple meshes to obtain a regional mesh model. The following is an explanation of the multiple second force results corresponding to the regional mesh models.

[0124] First, various stress conditions of the jacket frame foundation grid model under various unit conditions are determined respectively, and various first displacement boundary information of the jacket frame foundation grid model under various unit conditions are obtained respectively. Among them, the first displacement boundary information is used to describe the deformation of the jacket frame foundation grid model after being stressed, and the stress condition of the jacket frame foundation grid model can be roughly reflected through the deformation.

[0125] Then, the first displacement boundary information corresponding to the regional grid model is determined from the multiple first displacement boundary information; and the second displacement boundary information corresponding to the regional grid model is determined according to the first displacement boundary information corresponding to the regional grid model and the target area. Since the stress conditions of different areas of the basic grid model of the conductor rack are different, correspondingly, the deformations of the multiple areas of the conductor rack based on the grid model after being stressed will be different, so it is necessary to determine the first displacement boundary information corresponding to the target area from the multiple first displacement boundary information. The first displacement boundary information corresponding to the target area can only roughly reflect the stress conditions of the target area. According to the first displacement boundary information corresponding to the regional grid model and the target area, the second displacement boundary information corresponding to the regional grid model is determined. The second displacement boundary information is used to describe the deformation of the regional grid model after being stressed, and the stress conditions of the regional grid model can be accurately reflected through this deformation.

[0126] As a possible implementation method, after determining the target area, the first displacement boundary information corresponding to the target area can be directly determined to reduce the amount of calculation. For example, the first displacement boundary information of the regional grid model corresponding to the jacket foundation grid model under the above 7×6=42 unit working conditions is extracted to obtain the first displacement boundary information of 7×6=42 regional grid models.

[0127] Finally, according to the second displacement boundary information corresponding to the regional grid model, the stress conditions of the regional grid model under various combination working conditions are determined respectively, and a plurality of second stress results corresponding to the regional grid model are obtained.

[0128] For example, the 12 extreme working conditions calculated by the Bladed software are combined with the above 42 sub-model unit working conditions to obtain a plurality of second force results corresponding to 7×12=84 regional grid models.

[0129] As a possible implementation method, if the simulated working condition includes a combined working condition, the preset strength threshold corresponding to the target area is obtained, and if the stress-strain information is greater than the preset strength threshold, the target area is a dangerous area. For example, the plurality of second force results corresponding to the 84 regional grid models obtained above are processed to obtain the stress-strain information of the weld and the plate under the corresponding working condition, and compared with the predetermined design value (preset strength threshold) to determine whether the ultimate strength is met.

[0130] Case 1: Target area under fatigue condition.

[0131] The fatigue condition refers to the simulation condition including the aforementioned unit condition. For example, after obtaining 42 unit conditions, the stress conditions of the jacket foundation grid model under the 42 unit conditions are determined respectively, and a plurality of first stress results corresponding to a plurality of regions included in the jacket foundation model are obtained. From the plurality of first stress results, the region corresponding to the first stress result greater than the first preset stress threshold is determined as the target region, and the target region is the region that is prone to problems under the fatigue condition.

[0132] A regional sub-model is established for the target area, and based on the second size, the regional sub-model is divided into multiple grids to obtain a regional grid model. As a possible implementation method, a shell unit can be applied to the surface of the regional grid model so as to extract stress and strain information of the regional sub-model at the weld based on the shell unit. The following is an explanation of the multiple second force results corresponding to the regional grid models.

[0133] First, a second local coordinate system is established at the weld toe position of the regional grid model, wherein the second local coordinate system includes a first coordinate axis, a second coordinate axis and a third coordinate axis, wherein the first coordinate axis is parallel to the weld, the second coordinate axis is perpendicular to the weld, and the third coordinate axis is perpendicular to the first coordinate axis and the second coordinate axis. For example, a second local coordinate system is established at the weld toe position of the regional grid model, and the second local coordinate system may be a spatial coordinate system including an x-axis, a y-axis and a z-axis, wherein the x-axis is parallel to the weld, and the y-axis is perpendicular to the weld.

[0134] Then, according to the multiple unit working conditions, multiple stress components of the regional grid model in the three coordinate axis directions in the second local coordinate system are determined. At this time, the stress component is the second force result mentioned above.

[0135] For example, according to the specific relationship between load and stress, the fatigue time history load (i.e., the load whose magnitude and direction change with time) and the unit stress under the aforementioned 42 unit conditions (or the multiple second force results calculated in the second local coordinate system) are combined and calculated to obtain the three stress components of the shell unit under the corresponding simulation conditions, which can be expressed as σ x , σ y and τ xy Then the weld is calculated by the critical plane method (CPA) to obtain the stress spectrum at the weld toe, and the stress spectrum is subjected to rain flow statistics to obtain stress-strain information. Thus, the strength of the target area is determined by the fatigue time history load, or in other words, the calculation is performed using the time series load instead of the Markov matrix, which reduces the amount of calculation.

[0136] As a possible implementation method, the fatigue time-history load can be obtained based on the jacket foundation model (e.g., extracting the fatigue time-history load of the jacket foundation model at the target area according to the required working conditions), so that the fatigue time-history load can reflect the coupling effect of multiple loads. The target area is analyzed based on the fatigue time-history load, which is consistent with the actual physical world, avoids safety hazards to the jacket and improves the safety of the jacket foundation.

[0137] As a possible implementation method, multiple stresses in the three coordinate axis directions of the regional mesh model in the second local coordinate system can be determined first, and then the stress components can be determined based on the stresses. For example, in the second local coordinate system, the stress perpendicular to the weld is the first normal stress, which can be expressed as sy. The stress parallel to the weld is the second normal stress, which can be expressed as sx. The stress parallel to the weld is the shear stress, which can be expressed as sxy.

[0138] As a possible implementation method, the type of welds included in the regional grid model can be determined according to the welding specifications; the extrapolated reference points corresponding to the welds can be extracted according to the type of welds; and the multiple stress components of the regional grid model in the three coordinate axis directions in the second local coordinate system can be determined according to the extrapolated reference points corresponding to the welds and multiple unit working conditions.

[0139] For example, if the welds included in the current target area are welded based on the International Welding Association specification IIW, the weld toe type can be determined based on the provisions of IIW. If it is a type a weld (i.e., subsequent processing is performed along the surface of the structure), the extrapolated reference points are respectively at 0.4t and 1t from the weld toe, and t is the thickness of the tower wall used for interpolation. If it is a type b weld (i.e., subsequent processing is performed along the edge of the structure), the extrapolated reference points are at 4mm, 8mm, and 12mm from the weld toe. The APDL program of Ansys (a finite element software) is used to extract the sx, sy, and sxy of the shell unit under different unit conditions, thereby obtaining multiple stresses in the three coordinate axis directions of the pipe node model in the second local coordinate system under different simulation conditions, and determining the stress components based on the stresses.

[0140] As a possible implementation method, if the simulated working condition includes a unit working condition, the stress-life SN curve can be obtained; the fatigue strength of the target area at the weld is determined based on the stress-strain information and the SN curve. Among them, the SN curve is used to characterize the relationship between fatigue strength and fatigue life. For example, the Palmgren-Miner damage of the weld is obtained by combining the SN curve, and the fatigue strength safety factor SRF of the weld is obtained by taking the 25-year cumulative damage D=1 as the reference.

[0141] As a possible implementation method, the embodiment of the present application provides a specific implementation method of S105, that is, establishing a regional sub-model for the target area, dividing the regional sub-model into multiple grids based on the second size, and obtaining a specific implementation method of the regional grid model.

[0142] Specifically, a regional sub-model is established for the target area, the key area of ​​the regional sub-model is determined based on the welding specification, the key area is divided into multiple grids based on the third size, and the other areas are divided into multiple grids based on the second size to obtain a regional grid model.

[0143] Among them, the third dimension is smaller than the second dimension, and the other areas are the areas other than the key areas in the regional sub-model. Therefore, the key areas of the regional sub-model determined based on the welding specification are the areas that need to be analyzed intensively, and the stress conditions of the areas can be calculated finely based on finer dimensions to obtain more accurate results.

[0144] In addition to the method for determining the strength of a jacket foundation provided in the embodiment of the present application, a device for determining the strength of a jacket foundation is also provided, such as Figure 2 As shown, it includes: an acquisition unit 201, a division unit 202, a determination unit 203 and a screening unit 204;

[0145] The acquisition unit 201 is used to acquire the jacket basic model and multiple simulation conditions;

[0146] The division unit 202 is used to divide the jacket basic model into a plurality of grids based on a first size to obtain a jacket basic grid model, wherein the first size is greater than a preset threshold;

[0147] The determining unit 203 is used to respectively determine the stress conditions of the conductor rack basic grid model under the multiple simulation conditions, and obtain multiple first stress results corresponding to multiple regions included in the conductor basic model;

[0148] The screening unit 204 is configured to determine, from the plurality of first force results, an area corresponding to a first force result greater than a first preset force threshold as a target area;

[0149] The division unit 202 is further configured to establish a regional sub-model for the target region, and divide the regional sub-model into a plurality of grids based on a second size to obtain a regional grid model, wherein the second size is smaller than the first size;

[0150] The determining unit 203 is further used to respectively determine the stress conditions of the regional grid model under the multiple simulation conditions, and obtain multiple second stress results corresponding to the regional grid model respectively;

[0151] The determining unit 203 is further configured to determine stress-strain information of the regional mesh model according to the plurality of second force results.

[0152] It can be seen from the above technical solution that after obtaining the jacket foundation model and multiple simulation conditions, the jacket foundation model is divided into multiple grids based on a first size greater than a preset threshold, that is, based on a larger size, to obtain a jacket foundation grid model, and the stress conditions of the jacket foundation grid model under multiple simulation conditions are determined respectively, and multiple first stress results corresponding to multiple regions included in the jacket foundation model are obtained. From the multiple first stress results, the region corresponding to the first stress result greater than the first preset stress threshold is determined as the target expectation. The stress of the target region may be large, which may be a region with problems in the jacket foundation. In order to improve the accuracy of the target region analysis, a regional sub-model is established for the target region, and the regional sub-model is divided into multiple grids based on a second size less than the first size, that is, based on a smaller size, to obtain a regional grid model, and the stress conditions of the regional grid model under multiple simulation conditions are determined respectively, and multiple second stress results corresponding to the regional grid model are obtained. Then, based on the multiple second stress results, the stress-strain information of the regional grid model is determined, so as to analyze the strength of the region corresponding to the regional grid model based on the stress-strain information.

[0153] Therefore, the stress condition of the jacket foundation model is roughly calculated based on a larger size, and then the target area where problems may occur is screened out. Finally, the stress condition of the target area where problems may occur is finely calculated based on a smaller size. Therefore, there is no need to consider fine modeling of each area of ​​the jacket foundation model, but only fine modeling is performed on the target area where problems may occur, which shortens the time for solving the stress of the jacket foundation, and further shortens the time for determining the strength of the jacket foundation.

[0154] As a possible implementation, the tower bottom of the jacket foundation model has a load parachute, and the load parachute is used to evenly distribute the point load on the jacket foundation model; the device also includes a simulation condition determination unit, which is used to:

[0155] A plurality of first local coordinate systems are established at the center of the payload parachute, wherein the first local coordinate system includes three mutually perpendicular coordinate axes, and different coordinate axes represent the forces of the payload parachute in different directions. Other first local coordinate systems are obtained by rotating the target first local coordinate system based on the target axis. The target first local coordinate system is one of the plurality of first local coordinate systems, and the other first local coordinate systems are first local coordinate systems other than the target first local coordinate system in the plurality of first coordinate systems, and the target axis is one of the three coordinate axes.

[0156] The multiple simulation working conditions are obtained according to the multiple first local coordinate systems and the multiple preset working conditions. The simulation working conditions are used to describe the stress conditions of the jacket foundation model in different angles and directions under the different preset working conditions.

[0157] As a possible implementation, the device further includes a simulation condition determination unit, which is used to:

[0158] Applying unit force or unit moment to different coordinate axes included in each of the first local coordinate systems to obtain multiple unit working conditions, wherein the simulation working conditions include the unit working conditions; or,

[0159] A plurality of limit loads are applied to different coordinate axes included in each of the first local coordinate systems to obtain a plurality of combined working conditions, the simulated working conditions include the combined working conditions, and the limit loads are loads corresponding to actual limit working conditions.

[0160] As a possible implementation manner, if the simulated operating condition includes the combined operating condition, the determining unit 203 is further configured to:

[0161] Respectively determining various stress conditions of the jacket basic grid model under the various unit working conditions, and respectively obtaining various first displacement boundary information of the jacket basic grid model under the various unit working conditions, wherein the displacement boundary information is used to describe the deformation of the jacket basic grid model after being subjected to stress;

[0162] Determining first displacement boundary information corresponding to the regional grid model from the multiple types of first displacement boundary information;

[0163] Determining second displacement boundary information corresponding to the regional grid model according to the regional grid model and first displacement boundary information corresponding to the regional grid model;

[0164] According to the second displacement boundary information corresponding to the regional grid model, the stress conditions of the regional grid model under the multiple combined working conditions are determined respectively, and a plurality of second stress results respectively corresponding to the regional grid model are obtained.

[0165] As a possible implementation manner, if the simulated operating condition includes the unit operating condition, the determining unit 203 is further configured to:

[0166] Establishing a second local coordinate system at the weld toe position of the regional grid model, the second local coordinate system comprising a first coordinate axis, a second coordinate axis and a third coordinate axis, the first coordinate axis is parallel to the weld, the second coordinate axis is perpendicular to the weld, and the third coordinate axis is perpendicular to the first coordinate axis and the second coordinate axis;

[0167] According to the multiple unit working conditions, multiple stress components of the regional grid model in the three coordinate axis directions in the second local coordinate system are determined, and the stress components are the second force results.

[0168] As a possible implementation manner, the device further includes a judging unit, configured to:

[0169] If the simulated working condition includes the combined working condition, a preset strength threshold corresponding to the target area is obtained, and if the stress-strain information is greater than the preset strength threshold, the target area is a dangerous area;

[0170] If the simulated working condition includes the unit working condition, a stress-life SN curve is obtained, and the fatigue strength of the weld is determined according to the stress-strain information and the SN curve, and the SN curve is used to characterize the relationship between fatigue strength and fatigue life.

[0171] As a possible implementation manner, the determining unit 203 is specifically configured to:

[0172] Determining the type of welds included in the regional grid model according to welding specifications;

[0173] According to the type of the weld, extracting an extrapolated reference point corresponding to the weld;

[0174] According to the extrapolated reference point corresponding to the weld and the multiple unit working conditions, multiple stress components in the three coordinate axis directions of the regional grid model in the second local coordinate system are determined.

[0175] As a possible implementation manner, the dividing unit 202 is specifically configured to:

[0176] Establishing a regional sub-model for the target area, and determining a key area of ​​the regional sub-model based on welding specifications;

[0177] Based on the third size, the key area is divided into multiple grids, and based on the second size, other areas are divided into multiple grids to obtain the regional grid model, the third size is smaller than the second size, and the other areas are areas in the regional sub-model except the key area.

[0178] The present application also provides a computer device, see Figure 3 , which shows a structural diagram of a computer device provided in an embodiment of the present application, such as Figure 3 As shown, the device includes a memory 310 and a processor 320:

[0179] The memory 310 is used to store program codes and transmit the program codes to the processor;

[0180] The processor 320 is configured to execute any one of the strength determination methods for a jacket foundation provided in the above embodiments according to the instructions in the program code.

[0181] An embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store a computer program, wherein the computer program is used to execute any one of the strength determination methods for a jacket foundation provided in the above embodiments.

[0182] The embodiment of the present application also provides a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. A processor of a computer device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the strength determination method for the jacket foundation provided in various optional implementations of the above aspects.

[0183] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0184] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0185] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0186] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0187] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for determining the strength of a jacket foundation, characterized in that: The method comprises: Obtain the basic model of the jacket and various simulation conditions; Based on a first size, dividing the jacket basic model into a plurality of grids to obtain a jacket basic grid model, wherein the first size is greater than a preset threshold; Respectively determining the stress conditions of the conductor frame foundation grid model under the multiple simulation conditions, and obtaining a plurality of first stress results corresponding to a plurality of regions included in the conductor foundation model; From the plurality of first force results, determine an area corresponding to a first force result greater than a first preset force threshold as a target area; Establishing a regional sub-model for the target area, dividing the regional sub-model into a plurality of grids based on a second size to obtain a regional grid model, wherein the second size is smaller than the first size; Respectively determining the stress conditions of the regional grid model under the multiple simulation conditions, and obtaining a plurality of second stress results respectively corresponding to the regional grid model; The stress and strain information of the regional mesh model is determined according to the plurality of second force results.

2. The method according to claim 1, characterized in that The tower bottom of the jacket frame foundation model has a load parachute, and the load parachute is used to evenly distribute the point load on the jacket frame foundation model; the method also includes: A plurality of first local coordinate systems are established at the center of the payload parachute, wherein the first local coordinate system includes three mutually perpendicular coordinate axes, and different coordinate axes represent the forces of the payload parachute in different directions. Other first local coordinate systems are obtained by rotating the target first local coordinate system based on the target axis. The target first local coordinate system is one of the plurality of first local coordinate systems, and the other first local coordinate systems are first local coordinate systems other than the target first local coordinate system in the plurality of first coordinate systems, and the target axis is one of the three coordinate axes. The multiple simulation working conditions are obtained according to the multiple first local coordinate systems and the multiple preset working conditions. The simulation working conditions are used to describe the stress conditions of the jacket foundation model in different angles and directions under the different preset working conditions.

3. The method according to claim 2, characterized in that The obtaining of the plurality of simulation working conditions according to the plurality of first local coordinate systems and the plurality of preset working conditions comprises: Applying unit force or unit moment to different coordinate axes included in each of the first local coordinate systems to obtain multiple unit working conditions, wherein the simulation working conditions include the unit working conditions; or, A plurality of limit loads are applied to different coordinate axes included in each of the first local coordinate systems to obtain a plurality of combined working conditions, the simulated working conditions include the combined working conditions, and the limit loads are loads corresponding to actual limit working conditions.

4. The method according to claim 3, characterized in that If the simulated operating condition includes the combined operating condition, the method further includes: Respectively determining various stress conditions of the jacket frame basic grid model under the various unit working conditions, and respectively obtaining various first displacement boundary information of the jacket frame basic grid model under the various unit working conditions, wherein the first displacement boundary information is used to describe the deformation of the jacket frame basic grid model after being subjected to stress; The respectively determining the stress conditions of the regional grid model under the multiple simulation conditions to obtain a plurality of second stress results respectively corresponding to the regional grid model includes: Determining first displacement boundary information corresponding to the target area from the multiple types of first displacement boundary information; Determining second displacement boundary information corresponding to the regional grid model according to the regional grid model and the first displacement boundary information corresponding to the target area; According to the second displacement boundary information corresponding to the regional grid model, the stress conditions of the regional grid model under the multiple combined working conditions are determined respectively, and a plurality of second stress results respectively corresponding to the regional grid model are obtained.

5. The method according to claim 3, characterized in that: If the simulation working condition includes the unit working condition, then respectively determining the stress conditions of the regional grid model under the multiple simulation working conditions to obtain multiple second stress results corresponding to the regional grid model respectively includes: Establishing a second local coordinate system at the weld toe position of the regional grid model, the second local coordinate system comprising a first coordinate axis, a second coordinate axis and a third coordinate axis, the first coordinate axis is parallel to the weld, the second coordinate axis is perpendicular to the weld, and the third coordinate axis is perpendicular to the first coordinate axis and the second coordinate axis; According to the multiple unit working conditions, multiple stress components of the regional grid model in the three coordinate axis directions in the second local coordinate system are determined, and the stress components are the second force results.

6. The method according to claim 5, characterized in that Determining, according to the multiple unit working conditions, multiple stress components of the regional grid model in three coordinate axis directions in the second local coordinate system includes: Determining the type of welds included in the regional grid model according to welding specifications; According to the type of the weld, extracting an extrapolated reference point corresponding to the weld; According to the extrapolated reference point corresponding to the weld and the multiple unit working conditions, multiple stress components in the three coordinate axis directions of the regional grid model in the second local coordinate system are determined.

7. The method according to claim 1, characterized in that The method further comprises: If the simulated working condition includes the combined working condition, a preset strength threshold corresponding to the target area is obtained, and if the stress-strain information is greater than the preset strength threshold, the target area is a dangerous area; If the simulated working condition includes the unit working condition, a stress-life SN curve is obtained, and the fatigue strength of the weld is determined according to the stress-strain information and the SN curve, and the SN curve is used to characterize the relationship between fatigue strength and fatigue life.

8. The method according to claim 1, characterized in that The step of establishing a regional sub-model for the target region and dividing the regional sub-model into a plurality of grids based on the second size to obtain a regional grid model includes: Establishing a regional sub-model for the target area, and determining a key area of ​​the regional sub-model based on welding specifications; Based on the third size, the key area is divided into multiple grids, and based on the second size, other areas are divided into multiple grids to obtain the regional grid model, the third size is smaller than the second size, and the other areas are areas in the regional sub-model except the key area.

9. A strength determination device for a conductor frame foundation, characterized in that: The device comprises: an acquisition unit, a division unit, a determination unit and a screening unit; The acquisition unit is used to acquire the jacket basic model and multiple simulation conditions; The division unit is used to divide the jacket basic model into a plurality of grids based on a first size to obtain a jacket basic grid model, wherein the first size is greater than a preset threshold; The determining unit is used to respectively determine the stress conditions of the conductor frame basic grid model under the multiple simulation conditions, and obtain multiple first stress results corresponding to multiple regions included in the conductor basic model; The screening unit is used to determine, from the plurality of first force results, an area corresponding to a first force result greater than a first preset force threshold as a target area; The division unit is further used to establish a regional sub-model for the target area, and divide the regional sub-model into a plurality of grids based on a second size to obtain a regional grid model, wherein the second size is smaller than the first size; The determination unit is further used to respectively determine the stress conditions of the regional grid model under the multiple simulation conditions, and obtain multiple second stress results corresponding to the regional grid model respectively; The determining unit is further used to determine the stress-strain information of the regional grid model according to the multiple second force results.

10. A computer device, characterized in that: The device comprises a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the method according to any one of claims 1 to 8 according to the instructions in the program code.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program, and the computer program is used to execute the method according to any one of claims 1 to 8.

12. A computer program product, characterized in that The method comprises a computer program or an instruction; when the computer program or the instruction is executed by a processor, the method according to any one of claims 1 to 8 is executed.

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