Lateral-torsional coupled seismic response of sliding base-isolated structuresdue to the eccentric superstructure
Wang Jian-qiang1;Ding Yong-gang2;Li Da-wang3
1．School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China;2．School of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou 450052, China;3．School of Civil Engineering, Shenzhen University, Shenzhen 518060, China
Abstract： Lateral-torsional coupled seismic response of sliding base-isolated structures under bi-axial ground excitations is carried out. The influence of eccentricity and torsional stiffness in the superstructure is studied. It is shown that the influence of the mass eccentricity in the superstructure is more remarkable than that of the stiffness eccentricity in the superstructures. The seismic response of the base-isolated structure can be effectively diminished by decreasing the mass eccentricity in the superstructure. Even though the mass eccentricity is small, the influence of which should be take into account in the design of the base-isolated structure. The torsional stiffness of the superstructure has great impact on the response of the superstructure than which on the response of the isolation layer. Seismic response of the superstructure can be effectively diminished by increasing the torsional stiffness of superstructure.
2009, Vol. 28 
