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CN-121683392-B - Modeling method of finite element model of steel structure combined node

CN121683392BCN 121683392 BCN121683392 BCN 121683392BCN-121683392-B

Abstract

The invention relates to the field of modeling methods of finite element models, in particular to a modeling method of a finite element model of a steel structure combined node. Firstly, preprocessing acquired data to obtain preprocessed data, constructing an initial three-dimensional geometric model based on the preprocessed data, optimizing based on the preprocessed data and the initial three-dimensional geometric model to obtain optimized geometric parameters, outputting a steel structure combination accurate node finite element initial model based on the optimized geometric parameters, the preprocessed data and the initial three-dimensional geometric model, and finally, constructing a nonlinear dynamic response updating formula based on the steel structure combination accurate node finite element initial model to obtain equivalent stress. The method solves the technical problems that the stress synergistic effect of the node component is ignored by single parameter assignment, the modeling efficiency is low, the stress calculation error is large, and different section parameters and load working conditions cannot be accurately adapted.

Inventors

  • TENG ZUNLI
  • HE LAMEI

Assignees

  • 陇东学院

Dates

Publication Date
20260512
Application Date
20260210

Claims (7)

  1. 1. The modeling method of the finite element model of the steel structure combined node is characterized by comprising the following steps of: S1, data acquisition is carried out on a steel structure combination node to obtain acquired data, wherein the acquired data comprises basic design parameters, material mechanical parameters and test piece scale parameters, preprocessing is carried out on the basis of the acquired data to obtain preprocessed data, an initial three-dimensional geometric model is constructed on the basis of the preprocessed data, the geometric parameters are optimized through sine correction on the basis of the preprocessed data and the initial three-dimensional geometric model and in combination with a geometric nonlinear mapping theory, and the optimized geometric parameters are obtained, wherein a specific optimization formula is as follows: Wherein, the Is the optimized geometric parameter; indexing the components contained in the steel structure combined node; the total number of the components contained in the steel structure combined node; is the first Geometric parameter correction coefficients of the individual components; is the first Normalized cross-sectional area of the individual members; Is the first The actual height of the individual components; A component reference height; is the first Geometric powers of the individual building blocks; is the first A geometric nonlinear correction factor for each component; S2, based on the optimized geometric parameters, the preprocessed data and the initial three-dimensional geometric model, performing grid division, component positioning calibration and parameter giving, outputting a steel structure combination accurate node finite element initial model, constructing a nonlinear dynamic response updating formula based on the steel structure combination accurate node finite element initial model, and obtaining equivalent stress through nonlinear weight coefficients of components, linear region division and stress correction items based on Sigmoid nonlinear functions and variable step time attenuation correction items, wherein the nonlinear dynamic response updating formula is as follows: Wherein, the Is formed by combining steel structures at joints Equivalent stress at the moment; is the first Nonlinear weight coefficients of the individual components; is the first The individual members are at The Mises stress at the moment; is the first Stress-strain nonlinear coefficients of the individual members; is the first The individual members are at Strain at time; is the first Stress-strain delta coefficients for the individual components; is the first Attenuation factors of the individual components; The time index of the load action is used; Dividing a linear region and correcting a stress; the correction term is attenuated for the variable step time.
  2. 2. The modeling method of a steel structure combined node finite element model according to claim 1, wherein the S1 specifically comprises: Calculating the geometric parameter correction coefficient of the component based on the column axis pressure ratio of the component in the preprocessed data, and calculating the optimized geometric parameter based on the preprocessed data and the geometric parameter correction coefficient of the component and combining the power correction term and the sine correction term of the normalized height of the component.
  3. 3. The modeling method of a steel structure combined node finite element model according to claim 1, wherein the S2 specifically comprises: based on the optimized geometric parameters, the grid reference size is calculated by combining the component shape and the initial grid size of the initial three-dimensional geometric model, and based on the grid reference size, grid division is performed by combining the preprocessed data.
  4. 4. A method for modeling a steel structure composite node finite element model according to claim 3, wherein the step S2 specifically comprises: On the basis of grid division, calculating the geometric contribution duty ratio of the components based on the component assembly relation of the initial three-dimensional geometric model and the sub-term superposition logic of the optimized geometric parameters, and finely adjusting the relative assembly positions of the components based on the geometric contribution duty ratio of the components to perform component positioning calibration.
  5. 5. The modeling method of a steel structure combined node finite element model according to claim 4, wherein the step S2 specifically comprises: On the basis of component positioning calibration, based on an initial three-dimensional geometric model, combining basic design parameters and material mechanical parameters in the preprocessed data, giving physical and geometric properties to the initial three-dimensional geometric model, and outputting a steel structure combination accurate node finite element initial model.
  6. 6. The modeling method of a steel structure combined node finite element model according to claim 5, wherein the step S2 specifically comprises: And obtaining linear region division and stress correction terms based on the Mises stress of the component, and dividing the elastic, plastic and buckling stages of the stress of the node.
  7. 7. The modeling method of a steel structure combined node finite element model according to claim 4, wherein the step S2 specifically comprises: based on the geometric contribution duty cycle, a nonlinear weight coefficient of the component is calculated.

Description

Modeling method of finite element model of steel structure combined node Technical Field The invention relates to the field of modeling methods of finite element models, in particular to a modeling method of a finite element model of a steel structure combined node. Background The assembled steel frame beam column node is used as a building structure force transmission core, the mechanical property of the assembled steel frame beam column node directly determines the earthquake-resistant safety of the whole structure, and the assembled steel frame beam column node has extremely strong relevance with section design parameters such as column axial pressure ratio, column section type, flange plate thickness, stiffening rib size and the like, load working conditions such as monotone load, low-cycle repeated load and the like, the modeling precision of the node finite element model is more the reliability which directly influences the earthquake-resistant performance evaluation result, and the assembled steel structure beam column node is a key link of assembled steel structure engineering design and safety management and control. At present, the assembled steel frame structure is increasingly widely applied in the building field, the novel stiffening beam flange node is greatly popularized due to better stress performance, but the node components are complex in composition, the cooperative stress characteristics of the flange plate, the stiffening rib and the side plates are obvious, and higher requirements are provided for the suitability and the accuracy of a modeling method. The low-cycle repeated load test is widely used for testing the mechanical properties of the nodes as a mature standardized method for simulating the earthquake load, and the stress state of the nodes can be truly restored only by accurately adapting to the displacement loading mode in the modeling process. The existing modeling method mostly adopts a single parameter assignment mode, ignores stress synergistic effects of all node components, has insufficient modeling pertinence, lacks effective adaptation to seismic displacement loading in load simulation, is difficult to accurately restore complex stress characteristics of the node components, simultaneously, performs only focusing stress data comparison through model iterative correction, and performs full-dimension verification in an unbonded failure mode, so that modeling efficiency is low, stress calculation errors are large, and the complex stress scene of a novel stiffening beam flange node is difficult to adapt. Disclosure of Invention The invention provides a modeling method of a steel structure combined node finite element model, which aims to solve the technical problems that single parameter assignment ignores the stress synergistic effect of a node component, load simulation and seismic displacement loading adaptability are poor, model correction only focuses on stress and failure mode verification is not combined, modeling efficiency is low, stress calculation errors are large, and parameters of different sections and load working conditions cannot be accurately adapted. The invention discloses a modeling method of a steel structure combined node finite element model, which comprises the following steps: S1, acquiring data of a steel structure combined node to obtain acquired data, preprocessing the acquired data to obtain preprocessed data, constructing an initial three-dimensional geometric model based on the preprocessed data, and optimizing the preprocessed data and the initial three-dimensional geometric model to obtain optimized geometric parameters; S2, outputting a steel structure combination accurate node finite element initial model based on the optimized geometric parameters, the preprocessed data and the initial three-dimensional geometric model, and constructing a nonlinear dynamic response updating formula based on the steel structure combination accurate node finite element initial model to obtain equivalent stress. Preferably, the S1 specifically includes: Calculating the geometric parameter correction coefficient of the component based on the column axis pressure ratio of the component in the preprocessed data, and calculating the optimized geometric parameter based on the preprocessed data and the geometric parameter correction coefficient of the component. Preferably, the S2 specifically includes: and based on the grid reference size, combining the preprocessed data, and carrying out grid division. Preferably, the S2 specifically includes: On the basis of grid division, calculating the geometric contribution duty ratio of the component based on the initial three-dimensional geometric model and the optimized geometric parameters, and carrying out component positioning calibration. Preferably, the S2 specifically includes: Based on the positioning calibration of the component, based on the initial three-dimensional geometric model, parameter giving is carr