Seismic Analysis on Long-Span Steel-Truss Arch Bridge with Continuous Rigid-frame

Take Xinguang Bridge of Guangzhou city in China as an example, the paper is focused on the following study: The free vibration on long-span steel-truss arch bridge with continuous rigid-frame is carried out to obtain the natural frequencies and mode shapes. Furthermore under the condition of two steps and two levels probability, this paper examines the different internal forces that are produced in key members of the bridge by subjecting the bridge to earthquakes excitation in transverse direction, longitudinal direction, combined transverse and vertical directions, and combined longitudinal and vertical directions, while considering synchronous seismic time-history excitation and traveling wave seismic time-history excitation. It is found that traveling wave effect and shear wave speed of ground has great influence to the seismic response of large span continuous rigid-framed and steel-truss arch bridge. The conclusion of the paper provides a practical reference for large-span steel-truss arch bridge with continuous rigid frame arch bridge design practice.