SEISMIC BEHAVIOR OF LONG-SPAN CONNECTED STRUCTURES UNDER MULTI-SUPPORTED AND MULTI-DIMENSIONAL EARTHQUAKE EXCITATIONS

摘要

More and more connected structures with long-span corridors have been constructed during these years.As the span of corridor increases,h is necessary to consider their earthquake behaviour and insure aseismic safety.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 multi-dimensional and multi-support excitations are firstly established.Then,numerical simulation of a newly constructed connected structure with a span of 1 I0ta is performed.The influences of different earthquake components are compared and also the coupling effect is investigated under multi-dimensional earthquake excitation.Further,the influence of travelling-wave effect is analysed by comparing the seismic responses of the structure under multi-supported excitation with different apparent velocities.The results show that seismic responses will be increased if multi-dimensional earthquake excitation is considered,and wave-passage effect will greatly amplify the seismic responses of vertical earthquake components.