Damage Evaluation And Performance Assessment Of Steel-concrete Test Model Structure Due To Earthquakes

ABSTRACT:Damage is the main reason to destroy the structural function and cause its collapse, how to evaluate the damage extent of structure due to earthquake has always been a key issue in the field of earthquake engineering. To research the damage process of structure due to earthquakes, studies on the damage evaluation of a3-story steel-concrete test model structure are conducted, and the performance-based probabilistic seismic demand analysis of structure is also carried out. The main works are as follows,(1) The team prophase finished3-story steel-concrete model structure shaking table tests data including the displacement responses, the acceleration responses, the strain responses, the hysteretic energy dissipation, and the test phenomena are analyzed. The original Park-Ang two-parameter damage model for member is improved, and the parameters of the improved damage model are determined according to the shaking table tests data.(2) A finite element model of structure based on fiber element is established through ABAQUS software, and the elastic-plastic seismic analysis is conducted. The displacement responses of simulation are updated according to shaking table tests data, which are applied to the improved damage model to evaluate the damage process of structure, and comparison with the test displacement responses is also conducted. Results indicate that the improved damage model using the revised displacement responses can more accurately describe the damage process of structure, which can be used to evaluate the seismic performance of structure.(3) On the basis of performance-based earthquake engineering (PBEE) framework proposed by pacific earthquake engineering research (PEER) center located in the west of America, the probabilistic seismic demand analysis (PSDA) of the steel-concrete test model is conducted and4performance levels are defined. According to the results of incremental dynamic analysis, the vulnerability study of structure is conducted and the seismic fragility curves taking the maximum inter-story drift angle as variable are determined. Combined the vulnerability analysis with seismic hazard analysis, the seismic demand hazard curves of50years for structure are obtained, and the seismic performances of structure are assessed from the perspective of probability.