Analysis and discussion of response of torsion coupling under random excitation

In this paper an response of torsion coupling is investigated in base-isolated structure subject to random excitation with equivalent linearization method. Random analysis of eccentric isolated structure is performed with pseudo excitation method and filtered white noise ground excitation model. The power spectrum density and variance is calculated, and translation-torsion coupling response of eccentric structure is discussed. The torsion coupling response can not be ignored and the response of super structure can be reduced by using of base-isolation layer. With the increasing of torsional flexible of isolated layer, the response of structure is decreased as well as torsional effect of eccentric isolated structure.