Development of Seismic Response Spectrum for Long Span Bridge

The response spectrum has been developing along with the development of long span bridges.In the paper,some exiting problems in code response spectrum for long span bridges,such as long period spectrum value,techniques for response spectrum combination,seismic input direction,synthetical effect coefficient and damping ratio are summarized and discussed.The problems for future studies are pointed out.The results obtained in this paper provide reference values for revising the aseismic design specification of long span bridges.