Research on elastic-plastic failure behavior of steel double-layer grids structure system (36X36 m)used in the badminton practice gymnasium under strong earthquake wave

摘要

In this paper, the analysis on dynamic failure behaviors of steel double-layer grids supported by circumjacent steel columns used in a gymnasium with the function of earthquake victims shelter under strong earthquake wave is carried out under EL-Centro wave with SAP2000, and the appraisal results on their anti-failure performances are presented based on the plastic-hinge theory. In the analysis, the geometric and material nonlinear effects are considered simultaneously. The plastic development level of the rods, the deformed shape and the failure type and the ductility are estimated by plastic hinge principle. The results show that the failure model of the structure under the earthquake wave action is the complicated combination of strength failure and elastic-plastic dynamic local buckling in deferent areas of the structure; When the structure reached its failure critical limit, the development of the plastic hinges is not sufficient and only 9.95% of the rods enter into their plastic stage; Its critical failure peak acceleration of EL earthquake wave when applied in the combination of two directions is 1499.1 gal, which is 3.75 times more than the official seismic fortification level of 8 degree (major earthquake, 0.4 g) and can be served as earthquake victims shelter in the area of 8 degree seismic fortification; Its displacement ductility coefficient is 5.585, which shows the structure owns good energy dissipation capacity.