Seismic performance of vertical irregular hybrid spatial structures

Abstract

Shanghai pudong international airport terminal building 2 has total floor area of 400 thousand square meters and constitutes a terminal building, a boarding hall and mass transit stations. Its total length and width are 414 and 150 meters, respectively. In addition, it is a hybrid spatial structure, in which the upper steel roof and lower RC frame are assembled with Y-shaped steel columns. It could also be classified as a vertically irregular structure due to irregular dirstribution of the transverse stiffness. Up to now, no Chinese Design Code can be applied efficiently to this type of structure. The objective of this paper is to study the seismic performance of this hybrid spatial structure by means of nonlinear time history analyses when subjected to seismic excitations. Some important responses such as internal force, displacements are monitored and compared between different cases. The seismic performance of this structure is evaluated. The study attempts to investigate the weak point and accumulates the analytical evidence for establishing related design guidelines for such complex hybrid spatial structures in the future.