Analysis on dynamic failure behaviors of steel double-layer grids used in a hexagon gymnasium under strong earthquake action
In this paper,the elasto-plastic dynamic analysis on dynamic failure behaviors of a steel double-layer hexagon grid used in a swimming gymnasium with the function of earthquake victim shelter under disaster earthquake is carried out under EL-centro wave with SAP2000,and 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 elasto-plastic dynamic buckling of the structure.When the structure reached its failure critical limit,the development of the plastic hinges is not sufficient and only 11.1% of the rods enter into their plastic stage; The ratio of its maximal failure node vertical displacement and its short span is 1/171,which can meet the need for flexible non-structural attachment; Its critical failure peak acceleration of EL earthquake wave when applied in the combination of three directions is 790gal,which is 1.975 times more than the official seismic fortification level of 8 degree (major earthquake,400gal) and can be served as earthquake victims shelter in the area of 8 degree seismic fortification;Its displacement ductility coefficient is 1.6,which shows the structure owns good energy dissipation capacity.
Strong earthquake action Elasto-plastic dynamic response Steel double-layer grid Plastic hinge Seismic performance
P.C.Wu H.W.LI J.Liu
Department of Civil Engineering,Taiyuan University of Technology 79,Yingzexi Street,Taiyuan,030024,China
国际会议
沈阳
英文
383-387
2012-09-26（万方平台首次上网日期，不代表论文的发表时间）