Analysis of the Interaction between Stair and Frame under Horizontal Earthquake Action Based on ETABS

Two computer models of concrete frame with staircase were made and the seismic-performance of the models in elastic-phase was calculated by adopting base shear method, spectrum analysis by ETABS.The results show that including staircase into models will change the seismic performance of frame structure significantly.The paper proposes that the computer model with staircase and the response spectrum analysis should be used firstly in the seismic design of concrete frame with staircase.