Vertical Irregular Structure Pushover Analysis

Seismic design of structures Static analysis routine(such as bottom shear method,modal response spectrum method)is simple to operate,easy to promote,but it only applies to mass,stiffness and strength is more evenly distributed along the height of the structure.Time history analysis results,though relatively accurate,but because of earthquake input model uncertainty and complexity,computational cost and other characteristics,and can not be widely used.With the promotion and development of performance-based seismic design method,Pushover method for calculating a simplified method for seismic action,because of its simple and can effectively evaluate the seismic capacity of the structure,which has been widespread attention and application.However,due to two basic assumptions of the method as a precondition,the accuracy of the results of over-reliance on the selection and determine the target displacement calculation method of lateral load distribution pattern.After analyzing the development,application,basic assumptions,the theoretical basis of Pushover method for its accuracy depends largely on the results of the analysis to determine the target displacement and structured yield levels before and after the selected load distribution pattern of problems.By changing some floors storey establishment of four common vertical irregular RC frame structure with four different levels of lateral load distribution pattern of its Pushover analysis,and then to solve the structure at a predetermined earthquake two common methods target displacement under the action level,the Pushover analysis results compared with results using eight seismic elastic-plastic dynamic process analysis.By displacement can accurately reflect the variation of the structure and the ability to accurately determine the location of the weak layer,analyzed and compared various calculation method of target displacement,lateral load distribution mode applicability to different vertical irregular structure,and Pushover pushover analysis Applicability of vertical irregular RC frame.