Research on hybrid seismic test of steel frames based on equivalent stiffness modification of substructure
In order to study the effect of the equivalent stiffness of the experimental substructure on the results of the seismic hybrid simulation,according to the size and bearing capacity of the shaking table,a steel frame mod-el with two pairs,three floors and three spans is designed to do shaking table tests of earthquake simulation based on the natural frequency of the structure and the bearing capacity of the shaking table for shaking table test.According to the symmetry of the structure,the 1/4 and 1/2 structures of the bottom frame are selected as sub-structures,and the boundary degrees of freedom of the sub-structure are reduced based on the principle of structural deformation coordination.A dual-channel actuator technology is designed to simulate the boundary conditions of the test substructure,and then the hybrid simulation test of the designed three-story steel frame model is carried out.The results are consistent with the shaking table test,which indicates that when the seismic performance test of structural shaking table is influenced by such factors as table size and load-bearing,the hy-brid simulation based on the equivalent stiffness of the substructure can provide effective way for the structure seismic analysis.
shaking table testhybrid simulationsub-structuresequivalent stiffnessdegree of freedom reduc-tion
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