Research On The Isolation Efficiency Of A Self-isolated Structure With Recoverable Function

Self isolation structure is an isolation structure with part of its load-bearing components as self isolation components.At present,the self isolation components are mainly concrete-filled steel tubular columns,but the self isolation efficiency is poor due to the insufficient stiffness reduction and lack of energy dissipation capacity of concrete-filled steel tubular columns in the self isolation layer.Therefore,in this paper,for the self isolation structure of concrete-filled steel tubular columns in the dormitory building of Pengzhou middle school,the rocking column is proposed Based on the mechanical properties of self isolation components with restorable function and relevant current seismic codes,the design criteria are established,and the restorable self isolation efficiency is discussed by using nonlinear seismic time history response analysis The design criteria are verified.This article mainly carried out the following work:(1)The establishment of self isolation component with recoverable function: combined with the existing research of swing column and other components with recoverable function,it is concluded that swing column can be used as self isolation component,and through the change of mechanical properties of swing column before and after adding damping element,the influence of parameters of swing column and damping element on the mechanical properties of self isolation component with recoverable function is analyzed,and then the conclusion with recoverable function is obtained The constitutive relation of the self isolation component with recoverable function(rocking column and damping element).(2)The establishment of design criteria for self isolated structure with recoverable function: the design level target of self isolated structure with recoverable function is "no damage in moderate earthquake,repairable in large earthquake,no collapse in super large earthquake",and the specific design rules and design process are given according to the mechanical properties of self isolated components with recoverable function and relevant current seismic codes.(3)Verification of recoverable function,self isolation efficiency and design criteria of self isolation structure with recoverable function: according to the design criteria of self isolation structure with recoverable function,the self isolation structure with recoverable function(sisrf)is designed for the self isolation structure with concrete filled steel tubular column(siscfstc)of dormitory building of Pengzhou middle school.The nonlinear finite element models of siscfstc and sisrf are established Based on the nonlinear seismic time history response analysis of the two structures under medium,large and super large earthquakes,the self isolation efficiency and the recoverable function of the self isolation structure with recoverable function are discussed.In addition,the effectiveness of the design criteria is also discussed.