Research on elastic-plastic failure behavior of steel double-layer grids structure system (36×48m) used in the badminton practice gymnasium under strong earthquake wave

摘要

In this paper presents a calculation investigation on the Elastic-plastic incremental dynamic response elastic-plastic analysis of gymnasium practice hall under the loads of EL-Centro earthquake. The appraisal results on their anti-failure performances are presented under strong earthquake action based on the plastic-hinge theory. In the analyses, the geometric and material nonlinear effects are considered simultaneously based on the plastic-hinge theory. The plastic development level of the rod, 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 elasto-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 14.7% of the rods enter into their plastic stage; the maximum displacement of structural failure is 549 cm. Its critical failure peak acceleration of EL earthquake wave when applied in the combination of three directions is 733 gal, which is 1.8 times more than the official seismic fortification level of 8 degree (major earthquake, 0.2 g) and can be served as earthquake victims shelter in the area of 8 degree seismic fortification; Its displacement ductility coefficient is 5.034, which shows the structure owns good energy dissipation capacity.