With concentrated plastic hinge theory and SAP2000 software

the elastic-plastic time history analysis of a gym with roof structure of single-layer cylindrical reticulated shell supported by circumjacent steel columns is carried out under different earthquake ground motions.In the analysis both geometric and material nonlinear effects are taken into consideration.The node displacement responses

its plastic hinge distributions

and the deformation mode and failure patterns are obtained.The results show that:under earthquake ground motions

the assessed value of the failure peak of earthquake ground motions is 1260 Gal and its corresponding maximum vertical displacement is 1/163 of the short span

which could meet the requirements of the"earthquake refuge and relief system".The structure failure type is elastic-plastic dynamic buckling.Before buckling the number of the bars with plastic hinges is limited and its plastic development degree is not sufficient.Based on meeting the requirement of the stability capacity

the singlelayer cylindrical reticulated shell has a vemarkable seismic potential capacity.