Method and system for confirming seismic force of grid structure and storage medium

Abstract

The invention provides a grid structure seismic force confirmation method and system and a storage medium, and the method comprises the steps: combining a generated grid structure model with a main structure model in a design process of a grid structure, and carrying out the elastic time-history analysis of the whole structure model, thereby obtaining the acceleration time-history data of each support node on the grid structure, and carrying out the calculation of the acceleration time-history data. And according to the time history data of the acceleration at each support node, analyzing and obtaining the seismic force amplification coefficient at each support node, taking the maximum value or the weighted average value thereof as the seismic force amplification coefficient of the grid structure, and obtaining the seismic force which can be borne by the grid structure in practice. Based on elastic time-history analysis and acceleration time-history data at the support nodes, the seismic force amplification coefficient of the whole structure is obtained according to the seismic force amplification coefficient of each support node of the grid structure, and then the seismic force borne by the grid structure is analyzed and obtained, so that optimization guidance is performed on design and construction of the grid structure, and the design and construction efficiency is improved. And the safety of the grid structure is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of grid structures, and particularly relates to a method, a system and a storage medium for determining seismic forces of a grid structure. Background Art

[0002] A grid structure is an efficient, stable and aesthetic structural form. In a grid structure, multiple bars are connected through nodes to form a stable three-dimensional structural system capable of bearing various loads. Due to the advantages of light weight, high strength, large stiffness, good stability and easy construction of the grid structure, it has been widely used in the construction field.

[0003] In the process of simulating the design of a building with a grid structure, when the grid structure is installed on the main structure of the building using finite stiffness supports, the stiffness gap between the main structure and the finite stiffness supports is often relatively large. Therefore, when conducting grid structure simulation design, the grid structure is often set with the ground as the installation scenario to conduct various conventional load simulations to confirm the performance of the designed grid structure; this design method is simple and fast and is currently the main design method used in the industry.

[0004] However, seismic force loads are different from other conventional loads. Since seismic forces will be transmitted to the grid structure through the main structure during the action process, when analyzing the grid structure with the ground as the installation scenario according to the existing technology, the simulated seismic forces obtained will be smaller than the actual seismic forces received, resulting in insufficient seismic force bearing capacity of the designed and constructed grid structure and posing a great safety risk to people's lives and property in actual use. With the increasingly wide application of grid structures in buildings, it is of great significance to confirm the actual seismic forces received by the grid structure during the design process. Summary of the Invention

[0005] In order to solve the technical problem in the background art that when simulating the design of a building with a grid structure, the seismic forces received in the grid structure simulation analysis are smaller than the actual seismic forces received, resulting in insufficient seismic force bearing capacity of the designed and constructed grid structure and posing a safety risk to people's lives and property in actual use, the present invention provides a method, a system and a storage medium for determining seismic forces of a grid structure.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a method for confirming seismic forces of a grid structure, and the method for confirming seismic forces of the grid structure includes:

[0008] S1: Generate a grid structure model and a main structure model, and combine the grid structure model with the main structure model to obtain an overall structure model;

[0009] S2: Perform elastic time-history analysis on the overall structural model to obtain the time-history data of the acceleration at each support node of the grid structure;

[0010] S3: Analyze and obtain the seismic force amplification factor at each support node according to the time-history data of the acceleration at each support node;

[0011] S4: Take the maximum value or its weighted average of the seismic force amplification factors at all the support nodes as the seismic force amplification factor of the grid structure;

[0012] S5: Obtain the actual seismic force suffered by the grid structure based on the seismic force amplification factor of the grid structure.

[0013] Optionally, step S1 includes:

[0014] S1.1: Generate the grid structure model with the ground as the installation scenario;

[0015] S1.2: Generate the main structure model;

[0016] S1.3: Import and combine the grid structure model and the main structure model to obtain the overall structural model.

[0017] Optionally, step S2 specifically includes:

[0018] S2.1: Select seismic wave parameters;

[0019] S2.2: Perform elastic time-history analysis on the overall structural model according to the seismic wave parameters to obtain elastic time-history analysis data;

[0020] S2.3: Obtain the time-history data of the acceleration at each support node according to the elastic time-history analysis data.

[0021] Optionally, in step S2.1, the seismic wave parameters include the number of seismic waves, direction, and the maximum value of the seismic acceleration time history.

[0022] Optionally, step S3 specifically includes:

[0023] S3.1: Take the maximum absolute value according to the time-history data of the acceleration at each support node to obtain the maximum value max(a zi ) of the acceleration time history at each support node, where i = 1, 2... n, and n is the number of support nodes;

[0024] S3.2: Divide the maximum value max(a zi ) of the acceleration time history at each support node by the maximum value a of the seismic acceleration time history used in the elastic time-history analysisg ; Obtain the seismic force amplification coefficient K at each support node during elastic time history analysis ei , where i = 1, 2…n, and n is the number of support nodes

[0025] Optionally, in step S4, the process of obtaining the weighted average of the seismic force amplification coefficients at all the support nodes is as follows: Calculate the weighted average of the seismic force amplification coefficients at each support node according to the relationship between seismic force, seismic acceleration, and representative value of gravity load, as well as the relationship between the seismic force received by the support and the total seismic force; Take the weighted average of the seismic force amplification coefficients at each support node as the seismic force amplification coefficient of the space grid structure

[0026] Optionally, in step S4, the process of obtaining the weighted average of the seismic force amplification coefficients at all the support nodes specifically includes

[0027] S4.1: Obtain the seismic force F received by each support node evki , the representative value of gravity load G at each support node ei and the peak acceleration a at each support node zi ;

[0028] S4.2: According to the equations

[0029] F evki = G ei × a zi ,

[0030]

[0031] F evk = (∑F evki )

[0032]

[0033] Obtain the weighted average of the seismic force amplification coefficient K e ;

[0034] where, F evki is the seismic force received by each support node, unit: KN, F evk is the total seismic force received by the space grid structure, unit: KN; G ei is the representative value of gravity load at the support node, unit: KN; a zi is the peak acceleration at each support node, unit cm / s 2 ; a g is the maximum value of the seismic acceleration time history used in elastic time history analysis, unit cm / s 2 ; K e is the weighted average of the seismic force amplification coefficients at each support node;

[0035] S4.3: Using the weighted average value K of the seismic force amplification factors at each support node e as the seismic force amplification factor of the space truss structure.

[0036] In a second aspect, the present invention also provides a system for confirming the seismic force of a space truss structure, which is used for any one of the above-mentioned methods for confirming the seismic force of a space truss structure, and includes:

[0037] A modeling unit, configured to generate a space truss structure model and a main structure model, and combine the space truss structure model with the main structure model to obtain an overall structure model;

[0038] A processing unit, configured to perform an elastic time history analysis on the overall structure model to obtain the time history data of the acceleration at each support node of the space truss structure;

[0039] According to the time history data of the acceleration at each support node, analyze and obtain the seismic force amplification factor at each support node; or take the maximum value or its weighted average value among the seismic force amplification factors at all the support nodes as the seismic force amplification factor of the space truss structure;

[0040] Based on the seismic force amplification factor of the space truss structure, obtain the actual seismic force received by the space truss structure;

[0041] An output unit, configured to output the actual seismic force received by the space truss structure.

[0042] Optionally, when the processing unit obtains the weighted average value of the seismic force amplification factors at all the support nodes, according to the relationship between the seismic force and the seismic acceleration and the representative value of the gravity load, and the relationship between the seismic force received by the support and the total seismic force, calculate the weighted average value of the seismic force amplification factors at each support node; use the weighted average value of the seismic force amplification factors at each support node as the seismic force amplification factor of the space truss structure;

[0043] Based on the seismic force amplification factor of the space truss structure, obtain the actual seismic force received by the space truss structure.

[0044] In a third aspect, the present invention also provides a storage medium, in which instructions are stored, and the instructions are generated based on any one of the above-mentioned methods for confirming the seismic force of a space truss structure.

[0045] The beneficial effects of the present invention are:

[0046] (1) The present invention provides a method for confirming the seismic force of a grid structure. During the design process of the grid structure, after combining the generated grid structure model and the main structure model, elastic time history analysis is performed on the overall structure model to obtain the acceleration time history data at each support node of the grid structure. According to the acceleration time history data at each support node, the seismic force amplification factor at each support node is analyzed and obtained; the maximum value or its weighted average of the seismic force amplification factors at all support nodes is taken as the seismic force amplification factor of the grid structure, so as to obtain the seismic force that the grid structure will actually be subjected to. In the present invention, based on elastic time history analysis and the acceleration time history data at the support nodes, according to the seismic force amplification factors of each support node of the grid structure, the seismic force amplification factor of the entire structure is obtained, and then the seismic force received by the grid structure is analyzed and obtained, so as to optimize and guide the design and construction of the grid structure, improve the seismic protection performance, and ensure the safety of the grid structure.

[0047] (2) At the same time, in the method for confirming the seismic force of the grid structure of the present invention, through the relationship between seismic force and seismic acceleration and the representative value of gravity load, as well as the relationship between the seismic force received by the support and the total seismic force, the weighted average of the seismic force amplification factors at each support node is calculated; the weighted average of the seismic force amplification factors at each support node is used as the seismic force amplification factor of the grid structure, so as to obtain a more accurate seismic force amplification factor and the overall actual seismic force of the entire grid structure, optimize and guide the design and construction of the grid structure. At the same time, because a more accurate seismic force amplification factor is adopted, the economy and safety are taken into account, and it has more comprehensive advantages. Description of the Drawings

[0048] Figure 1 is a schematic diagram of the method for confirming the seismic force of the grid structure in the present invention;

[0049] Figure 2 is a schematic diagram of the grid structure and the main structure in the present invention;

[0050] Figure 3 is an engineering structure model diagram in which the main structure is a concrete frame structure in the example of the present invention;

[0051] Figure 4 is a schematic diagram of the initial version of the grid structure model generated in the example of the present invention;

[0052] Figure 5 is a schematic diagram of obtaining the acceleration time history data of each support node in the X direction and the Y direction in the example of the present invention;

[0053] Figure 6 is a schematic diagram of the numbering of each support node in the grid structure in the example of the present invention;

[0054] Figure 7 It is a schematic diagram of the seismic force amplification factor at each support node in the X direction in the example of the present invention;

[0055] Figure 8 It is a schematic diagram of the seismic force amplification factor at each support node in the Y direction in the example of the present invention;

[0056] Figure 9 It is a schematic diagram of another method for confirming the seismic force of the space frame structure in the present invention. Specific implementation manners

[0057] The present invention provides a method, a system and a storage medium for confirming the seismic force of a space frame structure, which are used to obtain the actual seismic force amplification factor and the seismic force received by the space frame structure during the construction process of the space frame structure.

[0058] Next, in conjunction with the accompanying drawings, the specific implementation manners of the present invention will be further described. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and cannot be used to limit the protection scope of the present invention.

[0059] In the prior art, during the process of simulating and designing a building with a space frame structure, since the space frame structure is often installed on the main structure of the building with finite stiffness supports, and the stiffness gap between the main structure and the finite stiffness supports can often reach 1 to 3 orders of magnitude, when simulating and designing the space frame, the space frame structure is often taken as the installation scenario on the ground to conduct various conventional load simulations, such as conventional loads such as dead load, live load, wind load, snow load, etc., to confirm the performance of the designed space frame structure; this design method is simple and fast, and is the main design method currently used in the industry.

[0060] The magnitudes of these conventional loads have little relation to the main structure, so they can generally be directly input for simulation during the simulation process.

[0061] However, the seismic force load is different from other conventional loads. Since the seismic force will be transmitted to the space frame structure through the main structure during the action process, when the space frame structure is simulated and analyzed with the ground as the installation scenario according to the prior art, the simulated seismic force received by it will be smaller than the actual seismic force received, which will cause the load simulation of the designed and built space frame structure to be inaccurate, and bring great safety risks to people's lives and property in actual use.

[0062] In the prior art, when confirming the seismic force load of a grid structure, the simulated input seismic force is generally directly multiplied by an empirical coefficient. Since seismic force is closely related to mass, this method has a certain feasibility when the mass of the grid structure is small. However, with the increasingly widespread application of grid structures in buildings, grid structures are also applied on a larger scale in various large buildings. This empirical method for determining seismic force can no longer meet the usage requirements and will also bring many uncertain safety hazards. Therefore, it is of great significance to confirm the actual seismic force received by the grid structure during the design process.

[0063] Embodiment 1

[0064] See Figure 1 , which shows a schematic diagram of a method for confirming the seismic force of a grid structure described in the present application. The method for confirming the seismic force of a grid structure includes the following steps:

[0065] S1: Generate a grid structure model and a main structure model, and combine the grid structure model with the main structure model to obtain an overall structure model;

[0066] S2: Conduct an elastic time history analysis on the overall structure model to obtain the time history data of the acceleration at each support node of the grid structure;

[0067] S3: Analyze and obtain the seismic force amplification factor at each support node according to the time history data of the acceleration at each support node;

[0068] S4: Take the maximum value or the weighted average of the seismic force amplification factors at all the support nodes as the seismic force amplification factor of the grid structure;

[0069] S5: Based on the seismic force amplification factor of the grid structure, obtain the actual seismic force received by the grid structure.

[0070] In this embodiment, during the design process of the grid structure, after combining the generated grid structure model and the main structure model, an elastic time history analysis is performed on the overall structure model to obtain the acceleration time history data at each support node of the grid structure. Based on the acceleration time history data at each support node, the seismic force amplification factor at each support node is analyzed and obtained; the maximum value among the seismic force amplification factors at all support nodes is taken as the seismic force amplification factor of the grid structure, so as to obtain the seismic force that the grid structure will actually receive. In the present invention, based on the elastic time history analysis and the acceleration time history data at the support nodes, the maximum seismic force amplification factor among many support nodes of the grid structure can be obtained as the seismic force amplification factor of the entire structure, and in a relatively conservative manner, the seismic force received by the grid structure is analyzed and obtained, so as to optimize and guide the design and construction of the grid structure, improve the seismic protection performance, and ensure the safety of the grid structure.

[0071] Optionally, step S1 in the present invention includes:

[0072] S1.1: Generate the grid structure model with the ground as the installation scenario;

[0073] S1.2: Generate the main structure model;

[0074] S1.3: Import and combine the grid structure model and the main structure model to obtain the overall structure model.

[0075] Specifically, when generating the grid structure model with the ground as the installation scenario, 3D3S software can be used for design; when generating the main structure model, YJK software or PKPM software can be used for design; after generating the grid structure model and the main structure model, the grid structure model can be imported into YJK software or PKPM software for combination to obtain the overall structure model; and an elastic time history analysis is performed on the overall structure model in subsequent operations.

[0076] Optionally, step S2 in the present invention specifically includes:

[0077] S2.1: Select seismic wave parameters;

[0078] S2.2: According to the seismic wave parameters, perform an elastic time history analysis on the overall structure model to obtain elastic time history analysis data;

[0079] S2.3: According to the elastic time history analysis data, obtain the acceleration time history data at each support node.

[0080] Optionally, in step S2.1 of the present invention, the seismic wave parameters include the number, direction, and maximum value of the seismic acceleration time history of the seismic wave.

[0081] Specifically, when performing elastic time history analysis in this embodiment, the relevant requirements in the national standard "Code for Seismic Design of Buildings GB / T 50011-2010" should be met. Generally, two methods are adopted: using 3 seismic waves (1 artificial wave and 2 natural waves) or 7 seismic waves (2 artificial waves and 5 natural waves). The selected seismic waves should also meet the requirements in Article 5.1.2-3.

[0082] Through elastic time history analysis, the time history data curves of the acceleration of each support node are obtained. For example, after performing elastic time history analysis with the YJK software, in the "Post-processing - Node Deformation" module, select the seismic wave condition and acceleration, pick up the grid support nodes in the model and add them, and then generate a data table to obtain the time history data of the acceleration of the support nodes.

[0083] Specifically, in this embodiment, the time history data of the acceleration of each support node may specifically include the X direction and the Y direction that are perpendicular to each other on the horizontal plane.

[0084] Optionally, in step S3 of the present invention, it specifically includes:

[0085] S3.1: According to the time history data of the acceleration at each support node, take the maximum absolute value to obtain the maximum value max(a zi ) of the acceleration time history at each support node, where i = 1, 2...n, and n is the number of support nodes;

[0086] S3.2: Divide the maximum value max(a zi ) of the acceleration time history at each support node by the maximum value a g of the seismic acceleration time history used in the elastic time history analysis; to obtain the seismic force amplification factor K ei at each support node during elastic time history analysis, where i = 1, 2...n, and n is the number of support nodes.

[0087] Specifically, in this embodiment, divide the maximum value of the acceleration time history at each support node by the maximum value a g of the seismic acceleration time history of each seismic wave during the elastic time history analysis. Since the seismic force and the seismic acceleration are in a proportional relationship, the seismic force amplification factor received by each support node under each seismic wave can be obtained. Take the maximum value among the seismic force amplification factors received by each support node under each seismic wave to determine the seismic force amplification factor of the entire grid structure in a more conservative manner, and combine it with the seismic force data from the simulation test to obtain the actual seismic force received by the grid structure. Based on the actual seismic force received, optimize the safety assessment of the grid structure.

[0088] Specifically, the maximum value a g of the seismic acceleration time history of each seismic waveThe value shall be determined according to the relevant requirements in the "Code for Seismic Design of Buildings GB / T 50011-2010".

[0089] Optionally, referring to Figure 9 , in step S4 of the present invention, the process of obtaining the weighted average of the seismic force amplification factors at all support nodes is as follows: According to the relationship between seismic force and seismic acceleration and the representative value of gravity load, as well as the relationship between the seismic force received by the support and the total seismic force, calculate the weighted average of the seismic force amplification factors at each support node; use the weighted average of the seismic force amplification factors at each support node as the seismic force amplification factor of the space grid structure.

[0090] Optionally, in step S4 of the present invention, the process of obtaining the weighted average of the seismic force amplification factors at all the support nodes specifically includes:

[0091] S4.1: Obtain the seismic force F evki received by each support node, the representative value of gravity load G ei at each support node, and the peak acceleration a zi at each support node;

[0092] S4.2: According to the system of equations

[0093] F evki = G ei × a zi ,

[0094]

[0095] F evk = (∑F evki )

[0096]

[0097] obtain the weighted average K e of the seismic force amplification factors;

[0098] wherein, F evki is the seismic force received by each support node, unit: KN, F evk is the total seismic force received by the space grid structure, unit: KN; G ei is the representative value of gravity load at the support node, unit: KN; a zi is the peak acceleration at each support node, unit cm / s 2 ; a g is the maximum value of the seismic acceleration time history used in the elastic time history analysis, unit cm / s 2 ; K e is the weighted average of the seismic force amplification factors at each support node;

[0099] S4.3: Use the weighted average value K of the seismic force amplification factors at each support node e as the seismic force amplification factor of the space truss structure.

[0100] In this embodiment, through the relationships between seismic force and seismic acceleration, the representative value of gravity load, and the relationship between the seismic force on the support and the total seismic force, the weighted average value of the seismic force amplification factors at each support node is calculated; using the weighted average value of the seismic force amplification factors at each support node as the seismic force amplification factor of the space truss structure, so as to obtain a more accurate seismic force amplification factor for the entire space truss structure and the actual seismic force suffered by the whole, optimize and guide the design and construction of the space truss structure. At the same time, due to the use of a more accurate seismic force amplification factor, both economy and safety are taken into account, and the space truss structure can be more reasonably optimized and designed during the design and construction process, with more comprehensive advantages.

[0101] Embodiment Two

[0102] Second, the present invention also provides a system for confirming the seismic force of a space truss structure, which is used for any one of the methods for confirming the seismic force of a space truss structure described in the above Embodiment One, and includes:

[0103] A modeling unit, which is used to generate a space truss structure model and a main structure model, and combine the space truss structure model with the main structure model to obtain an overall structure model;

[0104] A processing unit, which is used to perform an elastic time-history analysis on the overall structure model to obtain the time-history data of the acceleration at each support node on the space truss structure;

[0105] According to the time-history data of the acceleration at each support node, analyze and obtain the seismic force amplification factor at each support node; obtain the maximum value or its weighted average value among all the seismic force amplification factors at all the support nodes as the seismic force amplification factor of the space truss structure;

[0106] Based on the seismic force amplification factor of the space truss structure, obtain the actual seismic force suffered by the space truss structure;

[0107] An output unit, which is used to output the actual seismic force suffered by the space truss structure.

[0108] Optionally, when the processing unit obtains the weighted average value of the seismic force amplification factors at all the support nodes, according to the relationships between seismic force and seismic acceleration, the representative value of gravity load, and the relationship between the seismic force on the support and the total seismic force, calculate the weighted average value of the seismic force amplification factors at each support node; use the weighted average value of the seismic force amplification factors at each support node as the seismic force amplification factor of the space truss structure;

[0109] Based on the seismic force amplification factor of the grid structure, obtain the actual seismic force received by the grid structure.

[0110] It should be noted that the grid structure seismic force confirmation system provided in this embodiment corresponds to the grid structure seismic force confirmation method provided in Embodiment 1. Its implementation process and beneficial effects are also similar, and will not be elaborated here.

[0111] Embodiment 3

[0112] Thirdly, the present invention also provides a storage medium, in which instructions are stored, and the instructions are generated based on any of the grid structure seismic force confirmation methods provided in Embodiment 1 above.

[0113] Specifically, the storage medium described in the present invention may specifically include a random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk or CD-ROM. It should be noted that those skilled in the art can specifically select the form and type of the storage medium according to actual production and use requirements, and no further limitation is made in this embodiment.

[0114] It should be noted that those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working process of the above storage medium can refer to the corresponding process in Embodiment 1 above, and will not be elaborated here.

[0115] Embodiment 4

[0116] In order to more clearly explain the grid structure seismic force confirmation method provided in Embodiment 1 of the present invention, specific explanations are given through examples in this embodiment.

[0117] Exemplarily, referring to Figure 3 , a project structure model diagram with a concrete frame structure as the main structure is shown. The upper part of the main structure has a grid structure roof, and the grid structure is as shown in the green part in Figure 3 . During the design process, the grid structure adopts a regular square pyramid grid, and the grid structure is connected to the lower main body by elastic spherical bearings with limited stiffness to form a combined system of a concrete frame structure and a grid structure.

[0118] In order to simulate and analyze the actual seismic force received by the grid structure in this project during use, the grid structure seismic force confirmation method provided in Embodiment 1 is used to simulate and confirm the seismic force received by the grid structure, as follows.

[0119] S1: Generate a grid structure model and a main structure model, and combine the grid structure model with the main structure model to obtain an overall structure model, as shown in Figure 3As shown

[0120] Specifically, according to the engineering design plan, the form-finding of the space grid structure is carried out, and the space grid structure is generated with the ground as the installation scenario. The corresponding loads are input into the space grid design software, and section optimization and design are carried out to generate the initial space grid structure model. In this project, the space grid design software used is 3D3S software, and the generated space grid structure model is as Figure 4 shown

[0121] The generated space grid structure model is imported into the main structure design software to assemble into an overall structure model. The main structure design software used in this project is YJK software.

[0122] S2: Conduct elastic time history analysis on the overall structure model to obtain the time history data of the acceleration at each support node of the space grid structure.

[0123] Specifically, use the main structure design software to conduct elastic time history analysis on the overall structure model. When conducting elastic time history analysis, according to the relevant requirements in the national standard "Code for Seismic Design of Buildings GB / T50011-2010", specifically select two methods: using 3 seismic waves (1 artificial wave, 2 natural waves) or 7 seismic waves (2 artificial waves, 5 natural waves). The selected seismic waves should meet the requirements in Article 5.1.2-3.

[0124] In this example, referring to Figure 5 , select to use 3 seismic waves for elastic time history analysis. After conducting elastic time history analysis, in the "Post-processing - Node Deformation" module of the main structure design software, select the seismic wave condition and acceleration, pick up the space grid support nodes in the model and add them, and then generate a data table to obtain the time history data of the acceleration of each support node in the X direction and Y direction, where the X direction and Y direction are perpendicular to each other on the horizontal plane.

[0125] Among them, the schematic diagram of the numbers of each support node in the space grid structure in this example is as Figure 6 shown

[0126] After conducting elastic time history analysis on the overall structure model, the time history data of the acceleration a zi of each support node in the X direction and Y direction are obtained.

[0127] S3: According to the time history data of the acceleration at each support node, analyze and obtain the seismic force amplification factor at each support node.

[0128] Specifically, according to the time history data of the acceleration at each support node obtained in step S2, by taking the maximum absolute value in the corresponding direction, the maximum value max(a zi ) of the acceleration time history of each support node in the corresponding direction is obtained, and divided by the maximum value a of the seismic acceleration time history used in the time history analysisg to obtain the horizontal seismic force amplification factor K at each support node under the action of each seismic wave during the elastic time history analysis ei .

[0129] Furthermore, the corresponding direction here means that when the seismic force method coefficient in the X direction needs to be obtained, the seismic wave condition is selected as "Seismic Wave (0 degrees)" to obtain the time history data in the X direction; if the seismic force method coefficient in the Y direction needs to be obtained, the seismic wave condition is selected as "Seismic Wave (90 degrees)" to obtain the time history data in the Y direction.

[0130] Furthermore, the maximum value a of the seismic acceleration time history used in the time history analysis g is selected according to Table 5.1.2-2 in the "Code for Seismic Design of Buildings".

[0131] The seismic force amplification factors at each support node obtained are as Figure 7 and Figure 8 shown.

[0132] S4: In this step, the maximum value among the seismic force amplification factors at all support nodes can be taken as the seismic force amplification factor of the space grid structure.

[0133] Referring to Figure 7 and Figure 8 , it can be known that the maximum values of the seismic force amplification factors in the X direction and Y direction at all support nodes in this example are 5.0. If a more conservative design scheme is adopted, the maximum value among the seismic force amplification factors can be taken as the seismic force amplification factor of the space grid structure, that is, 5.0 is used as the seismic force amplification factor at all support nodes to obtain the actual seismic force received by the space grid structure, and corresponding adjustment or strengthening treatment is carried out on the space grid structure.

[0134] Furthermore, referring to Figure 7 and Figure 8 , it can be known that the seismic force amplification factor in the X direction is from 1.5 to 5.0, while the seismic force amplification factor in the Y direction is from 1.8 to 4.0. If the maximum value of 5.0 is directly taken as the seismic force amplification factor at all support nodes for calculation and subsequent processing, it may lead to waste of working hours and materials. For economic and efficiency considerations, a suitable method is also needed to obtain the overall amplification factor during design.

[0135] Therefore, in step S4, the weighted average value of the seismic force amplification factors at all the support nodes can also be obtained: according to the relationship between the seismic force and the seismic acceleration and the representative value of the gravity load, as well as the relationship between the seismic force received by the support and the total seismic force, the weighted average value of the seismic force amplification factors at each support node is calculated; the weighted average value of the seismic force amplification factors at each support node is taken as the seismic force amplification factor of the space grid structure.

[0136] Specifically, obtain the seismic force F evki acting on each support node, the representative value G ei of the gravity load at each support node, and the peak acceleration a zi at each support node;

[0137] According to the system of equations

[0138] F evki = G ei × a zi ,

[0139]

[0140] F evk = (∑F evki )

[0141]

[0142] calculate the weighted average value K e of the seismic force amplification factor;

[0143] wherein, F evki is the seismic force acting on each support node, unit: KN, F evk is the total seismic force acting on the space grid structure, unit: KN; G ei is the representative value of the gravity load at the support node, unit: KN; a zi is the peak acceleration at each support node, unit cm / s 2 ; a g is the maximum value of the seismic acceleration time history used in the elastic time history analysis, unit cm / s 2 ; K e is the weighted average value of the seismic force amplification factors at each support node;

[0144] Through the above steps, obtain the weighted average value K e of the seismic force amplification factors at each support node as the seismic force amplification factor of the space grid structure.

[0145] Through the relationship between the seismic force, seismic acceleration, and representative value of the gravity load, as well as the relationship between the seismic force received by the support and the total seismic force, calculate the weighted average value of the seismic force amplification factors at each support node; use the weighted average value of the seismic force amplification factors at each support node as the seismic force amplification factor of the space grid structure, so as to obtain a more accurate seismic force amplification factor and the overall actual seismic force received by the entire space grid structure, optimize and guide the design and construction of the space grid structure. At the same time, due to the use of a more accurate seismic force amplification factor, both economy and safety are taken into account, and the space grid structure can be more reasonably optimized and designed during the design and construction process, with more comprehensive advantages.

Claims

1. A method for confirming earthquake force of a grid structure, characterized in that: The grid structure seismic force confirmation method comprises: S1: generating a grid structure model and a main structure model, and combining the grid structure model with the main structure model to obtain an overall structure model; S2: performing elastic time history analysis on the overall structural model to obtain time history data of acceleration at each support node on the grid structure; S3: Analyze and obtain the seismic force amplification factor at each support node according to the time history data of the acceleration at each support node; S4: taking the maximum value or the weighted average value of the seismic force amplification coefficients at all the support nodes as the seismic force amplification coefficient of the grid structure; S5: Based on the seismic force amplification coefficient of the grid structure, the seismic force actually exerted on the grid structure is obtained.

2. The method for confirming earthquake force of grid structure according to claim 1, characterized in that: The step S1 includes: S1.1: Taking the ground as the installation scene, generating the grid structure model; S1.2: generating the main structure model; S1.3: Import and combine the grid structure model with the main structure model to obtain the overall structure model.

3. The method for confirming earthquake force of grid structure according to claim 2, characterized in that: The step S2 specifically includes: S2.1: Select seismic wave parameters; S2.2: performing elastic time history analysis on the overall structural model according to the seismic wave parameters to obtain elastic time history analysis data; S2.3: Based on the elastic time history analysis data, obtain the time history data of acceleration at each support node.

4. The method for confirming earthquake force of grid structure according to claim 3, characterized in that: In step S2.1, the seismic wave parameters include the number and direction of the seismic waves and the maximum value of the seismic acceleration time history.

5. The method for confirming earthquake force of grid structure according to claim 4, characterized in that: The step S3 specifically includes: S3.1: Based on the time history data of the acceleration at each support node, take the maximum absolute value to obtain the maximum value of the acceleration time history at each support node max(a zi ), where i = 1, 2…n, and n is the number of support nodes; S3.2: The maximum value of the acceleration time history at each support node is max(a zi ), divided by the maximum value of the earthquake acceleration time history used in the elastic time history analysis a g ; When elastic time history analysis is performed, the seismic force amplification factor K at each support node is obtained ei , where i=1, 2…n, and n is the number of support nodes.

6. The method for confirming earthquake force of grid structure according to claim 1, characterized in that: In step S4, the process of obtaining the weighted average value of the seismic force amplification coefficients at all the support nodes is as follows: based on the relationship between the seismic force and the seismic acceleration, the representative value of the gravity load, and the relationship between the seismic force exerted on the support and the total seismic force, the weighted average value of the seismic force amplification coefficients at each support node is calculated; and the weighted average value of the seismic force amplification coefficients at each support node is used as the seismic force amplification coefficient of the grid structure.

7. The method for confirming earthquake force of grid structure according to claim 6, characterized in that: In step S4, the process of obtaining the weighted average value of the seismic force amplification coefficients at all the support nodes specifically includes: S4.1: Obtain the seismic force F at each support node. evki , the representative value of gravity load at each support node G ei and the peak acceleration a at each support node zi ; S4.2: According to the system of equations F evki =G ei ×a zi , F evk =(∑F evki ), Obtain the weighted average value of the seismic force amplification factor K e ; Among them, F evki is the seismic force at each support node, unit: KN, F evk is the total seismic force on the grid structure, unit: KN; G ei is the representative value of the gravity load at the support node, unit: KN; a zi The peak acceleration at each support node, in cm / s 2 ; a g The maximum value of the earthquake acceleration used in elastic time history analysis, in cm / s 2 ; K e is the weighted average value of the seismic force amplification coefficient at each support node; i = 1, 2…n, n is the number of support nodes; S4.3: Take the weighted average value K of the seismic force amplification factor at each support node e As the seismic force amplification factor of the grid structure.

8. A grid structure seismic force confirmation system, used in the grid structure seismic force confirmation method according to any one of claims 1 to 7, characterized in that: include: A modeling unit, used to generate a grid structure model and a main structure model, and combine the grid structure model with the main structure model to obtain an overall structure model; A processing unit, used for performing elastic time history analysis on the overall structural model to obtain time history data of acceleration at each support node on the grid structure; Analyze and obtain the seismic force amplification factor at each support node according to the time history data of the acceleration at each support node; obtain the maximum value or weighted average value of the seismic force amplification factors at all the support nodes as the seismic force amplification factor of the grid structure; Based on the seismic force amplification coefficient of the grid structure, obtaining the seismic force actually exerted on the grid structure; The output unit is used to output the actual seismic force exerted on the grid structure.

9. The grid structure seismic force confirmation system according to claim 8, characterized in that: When the processing unit obtains the weighted average value of the seismic force amplification coefficients at all the support nodes, the weighted average value of the seismic force amplification coefficients at each support node is calculated based on the relationship between the seismic force and the seismic acceleration and the representative value of the gravity load, and the relationship between the seismic force on the support and the total seismic force; the weighted average value of the seismic force amplification coefficients at each support node is used as the seismic force amplification coefficient of the grid structure; Based on the seismic force amplification coefficient of the grid structure, the seismic force actually exerted on the grid structure is obtained.

10. A storage medium, characterized in that: The storage medium stores instructions, which are generated based on the grid structure seismic force confirmation method according to any one of claims 1 to 7.

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