SEISMIC ANALYSIS OF LONG-SPAN CONNECTED STRUCTURES UNDER MULTI-SUPPORT AND MULTI-DIMENSIONAL EARTHQUAKE EXCITATIONS

Seismic response of long-span connected structure under multi-dimensional and multi-support excitation is investigated. Algorithms for seismic analysis of long-span connected structure under multidimensional and multi-support excitation are first established, and the effect of different earthquake components and wave passage effect are analyzed. And then numerical simulation is carried out on a long-span connected structure under one-dimensional and three-dimensional, uniform and travelling wave excitations. The results show that seismic response will be increased if multi-dimensional earthquake excitation was considered; Wave passage effect will greatly amplify the seismic responses of vertical earthquake components; the seismic responses of different elements can either be increased or decreased if wave passage effect was considered, and great influence of wave passage effect was noticed for braces near connections between the main tower and corridor; furthermore, the dominant internal force of the corridor structure may be increased by 14.69% under travelling wave excitation. Therefore, it is necessary for a seismic design of long-span connected structure to take into account multi-dimensional and multi-support earthquake excitations.