Study on Dynamic Failure Behaviors of Steel Double-Layer Grids(36×36m) Supported by Tridimensional Truss Columns Used in a Gymnasium under Disaster Earthquake Action

Abstract

The study was carried out under El-Centro wave with SAP2000, and the appraisal results on their anti-failure performances were presented under strong earthquake action based on theplastic-hinge theory. In the analyses, the geometric and material nonlinear effects were considered simultaneously. The plastic development level of the rods, the deformed shape and the failure type and the ductility were 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; When the structure reached its failure critical limit, only 14% of the rods enter into their plastic stage and the development of the plastic hinges is not sufficient; Its critical failure peak acceleration of EL earthquake wave when applied in the combination of three directions is 969gal, which is equivalent 2.425 times to the official seismic fortification level of 8 degree (major earthquake, 0.4g) and it can be served as earthquake victims shelter in the area of 8 degree seismic fortification; Its displacement ductility coefficient is 2.88, which shows the structure owns some energy dissipation capacity.