Seismic Performance Analysis Of Frame-staircase System Based On MIDAS/Gen

Stairway is an important escape way when earthquake happens. However,earthquake damage in recent years indicates that the frame-stairwell has beendestroyed seriously after earthquake.As a result, seismic performance offrame-staircase system under rare earthquake remains to be further studied.This articlefocuses on how the two support modes of stair landing girder and two layout plans forstairwell’s surrounding column grid influence seismic performance of frame-stairwaysystem.By using MIDAS/Gen of finite element analysis, this article builds six structuremodels in the case of two support modes of stair landing girder and two layout plansfor frame column.Based on response spectrum analysis of six structure models underfrequent earthquake,it concludes how different support modes of stair landing girderand different layout plans for frame column influence structural deformation,Equivalent Base Shear force, frame column and frame beam internal force. By usingloading method with vibration mode load, it analyzes Pushover to four structuremodels under rare earthquake and works out Equivalent Base Shearforce, inter-layerdisplacement and the development state of plastic hinge of structure under performancepoint of rare earthquake. It makes nonlinear dynamic time-history analyses to fourstructure models on the respective effect of El Centro and Taft seismic wave and worksout the time-history response and peak response under rare earthquake of the fourmodels.By the comparison of analysis result of response spectrum under each model infrequent earthquake and the comparison of Pushover analysis result of each model inrare earthquake and comparison of analysis result of nonlinear dynamic time-historyunder each model, it evaluates the influence of support mode of stair landing girder andlayout for frame column on seismic performance of frame-staircase system.Finally,itfinds better support mode of stair landing girder and layout plan for frame column andprovide reference for seismic design of the staircase.