Novel hybrid test method based on multi-scale model updating

A technology for model updating and hybrid testing, applied in instrumentation, geometric CAD, design optimization/simulation, etc., which can solve problems such as discrepancies, changing the stress state of structures, and constitutive model errors

Active Publication Date: 2020-02-14
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0005] However, due to the complexity of the seismic motion, there are certain errors in the test results of the hybrid test evaluation. There are two main sources of error in the hybrid test, one is the incompleteness of the boundary conditions of the test substructure, and the other is the constitutive model error. When the physical substructure When there are many degrees of freedom in the boundary of the structure, due to the limitations of loading equipment, test site and test funds, the boundary conditions are often difficult to fully realize, and the lack of boundary conditions will inevitably change the stress state of the structure and affect the accuracy of st

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specific Embodiment approach 1

[0025] Specific embodiment one, a kind of novel mixed test method based on multi-scale model update, comprises the following steps:

[0026] Step 1. Discretize the overall structure to be measured into a numerical model of the overall structure in the finite element analysis software, and simultaneously select a substructure for providing a model parameter update part in the numerical model of the overall structure;

[0027] Step 2. Solve the structural motion equation in the time integration module, and send the displacement of the dynamic degree of freedom of the overall structure to the corresponding degree of freedom in the numerical model of the overall structure, and use the displacement of the current step and the model parameters of the previous step in the finite element analysis In the software, a nonlinear static analysis is performed on the numerical model of the overall structure, and the calculated displacement on the boundary degrees of freedom of the test substr...

specific Embodiment approach 2

[0046] Specific implementation mode 2. A new hybrid test method based on multi-scale model update. In this embodiment, the hybrid test of the concrete frame structure with anti-buckling braces is taken as an example. In order to fully understand the concrete frame The seismic response of the structure under real earthquake action and the failure sequence of each component in the overall structure require experimental research on the overall structure. When conducting the overall structural test research, it is necessary to build a large-scale full-scale buckling-resistant braced frame structure, and then use a hybrid However, since this kind of test is often completed in the laboratory, and it is impossible to build a large-scale full-scale anti-buckling braced frame structure in the test, a hybrid test method is used to study the concrete frame structure equipped with buckling-resistant braces. Seismic performance is the only feasible method under the existing technology and t...

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Abstract

The invention discloses a novel hybrid test method based on multi-scale model updating, and belongs to the technical field of structural engineering anti-seismic tests. The method comprises the following steps: step 1, discretizing a to-be-measured overall structure into a numerical model of the overall structure, and selecting a substructure for providing a model parameter updating part; step 2,solving a structure motion equation, carrying out nonlinear static analysis, and sending the calculated displacement on the boundary freedom degree of the test substructure to an actuator connected with the test substructure; step 3, loading the test piece by the actuator in the step 2 according to the displacement calculated by the finite element analysis software, and sending the actually measured displacement and counterforce to a parameter estimation module; step 4, carrying out online estimation on constitutive model parameters; and step 5, repeating the step 2 to the step 4 until the test is finished. Complex structures containing different types of components can be selected as test substructures, so that material hierarchy and component hierarchy numerical model parameter updatingcan be realized at the same time.

Description

technical field [0001] The invention relates to a large-scale engineering structure hybrid test method, belonging to the technical field of structural engineering seismic tests. Background technique [0002] Hybrid test is a structural seismic test method that combines laboratory physical loading with computer numerical simulation. It can complete large-scale structural dynamic tests and evaluate the seismic response and seismic performance of the overall structure. [0003] When evaluating the seismic response and seismic performance of building structures, the research on the seismic performance of building structures has developed from the seismic performance of structural parts to the research on the seismic performance of the overall structural system. In terms of single finite element analysis and traditional seismic test methods, the ordinary finite element analysis mainly uses finite element software to establish a finite element model of the building structure for s...

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Application Information

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IPC IPC(8): G06F30/23G06F30/13G06F119/14
Inventor 孟丽岩刘家秀王涛吴斌王贞宁西占许国山杨格
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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