Parameter identification of a shear-type building based on seismic response with unknown ground motion
In recent years,special attentions have been given to the structural safety and dynamic performance of bridges and buildings especially under seismic load.Therefore,regarding a group of structures in a specific region,it is quite important to know the seismic excitation as the input for further evaluations.One of the two purposes of this paper is to know the real excitation using the input inversion,and the other is to obtain the structural responses that are not recorded or observed.A method is proposed for the structural parameters identification and ground motion inverse of shear-type structures under unknown seismic excitation with observations of structural absolute acceleration responses.The structural dynamic equation is firstly converted to a form based on the equation of motion,and parameters above the first story of a shear structure can be directly identified by using least squares method.Then,stiffness parameter of the first story can be identified from the characteristic equation.Assuming that the response of the structure of the last few seconds are damped free vibration,damping parameter can be identified.Finally,in the transformation space,it is assumed that the seismic input is equal for any three adjacent sampling moments,the input ground motion can be identified.Numerical simulation of a six-story structure demonstrated that structural parameters and ground motion history can be accurately identified by using proposed inversion algorithm.
transform space method least squares method structural parameter identification unknown seismic excitation ground motion inversion
J.Yang L.Sun Y.Xia
Department of Bridge Engineering,Tongji University,Shanghai,China Department of Bridge Engineering,Tongji University,Shanghai,China;State key Laboratory for Disaster
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
3386-3393
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）