Study On Multi-parameter Performance-based Seismic Design Method For Large Cantilever Overrun High-rise Structure

At present,the size of overrun high-rise is becoming more and more complex,the function is more comprehensive.The structure of large cantilever is popular with architects.The emergence of large cantilever overrun high-rise poses a new challenge to seismic design of structures.The aseismic design method of our country is based on the checking calculation of bearing capacity and interstory displacement angle of small earthquakes,the interstory displacement angle is used to check the deformation of elastic-plastic deformation under large earthquakes.However,large cantilever overrun high-rise internal components can not be comprehensively measured by using interstory displacement angle alone.Thus,a multi-parameter performance-based seismic design method for large cantilever overrun high-rise is proposed in this paper,.It is intended to improve the performance-based aseismic design method by increasing the deformation index of the members to judge the performance level of the large cantilever structure.This paper takes the large cantilever overlimit structure as the research object,the design method of seismic performance based on multi-parameter is studied.The main work of the study is as follows:(1)Design a large cantilever overrun high-rise based on the current specification and determine the preliminary design scheme.Judge the structure beyond the limit and put forward the strengthening measures of the structure design.Use the YJK software to analyze the elasticity of the structure,the elastic-plastic analysis,judge whether the period ratio and displacement ratio of the structure can meet the requirements of the code.Based on the analysis of large cantilever overrun high-rise,the necessity of establishing a multi-parameter performance-based seismic design method for large cantilever overrun high rise is illustrated.(2)Based on the analysis of domestic and foreign codes and related documents,the seismic action level of large cantilever overrun high-rise is determined.The five performance levels,the limit value of interstory displacement angle and the limit value of component deformation index are determined.Propose a multi-parameter performance-based seismic design method and steps for large cantilever overrun high-rise structures.(3)Design a performance-based design method based on a multi parameter performance-based seismic design for large cantilever overrun high-rise,make elastic and elastic-plastic analysis of the structure,judge the performance level of the structure,and verify the feasibility of the multi-parameter seismic performance-based design method of large cantilever overrun high-rise proposed in this paper.