Novel hybrid test method based on multi-scale model updating

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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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 structural performance evaluation.

In addition, when the prototype structure is not only a traditional structure composed of a single material, such as a new structure equipped with energy-dissipating and shock-absorbing components, in the past hybrid tests, only the material constitutive model parameters were identified and updated for the main structure, ignoring the importance of The parameter identification and update of the component constitutive model of other important components composed of different materials will inevitably lead to a large difference between the response of the numerical substructure and the real response of the prototype structure during the test

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