Application and research on responses of large space structure under multi-support seismic excitation

Based on the 'Code for seismic design of buildings (2010)', seismic analysis under multi-support excitation should be done to structures with large dimension. The time-history seismic analysis method is popular among the main methods used for multi-support seismic analysis. In confirming the multi-support earthquake wave, the traveling wave effect and local site effect are two critical factors. Generally, there are two methods to make multi-support excitation analysis in finite element program. One is the compulsory boundary condition method, and the other is the big-mass method. The paper suggests taking the overload element and overload proportion as the evaluation index to the influence of multi-support seismic analysis. At the same time, some common conclusions are summarized in the paper based on the analysis experience of some projects. Such conclusions include that the torsion effect will be increased under multi-support seismic analysis and then result in adverse effect on the corner and side members. The earthquake input synchronization will be reduced under multi-support seismic analysis and then decrease the structure translational displacement. Generally, the influence of multi-support seismic analysis will be increased along with the reduction of traveling wave velocity while be decreased along with the increase of the building height.