Nonlinear analysis of seismic response of long-span PC cable-stayed bridges

bridge engineering;  cable-stayed bridges;  seismic response;  geometric nonlinearity;  Finite element analysis

Based on the seismic response analysis method of long-span bridges, a spatial finite element model of dynamic analysis of cable-stayed bridges is established. Considering the influence of geometric nonlinearity on the dynamic characteristics and seismic response of the structure, a long-span prestressed concrete cable-stayed bridge was used as the research object, and the seismic nonlinear time history analysis of the bridge was carried out by direct integral method. According to the scheme design of the bridge, the dynamic characteristics of the structure under the connection mode of the two tower girder are compared, and the influence of pile soil effect on the seismic response of the structure is analyzed. The calculation results show that the influence of pile-soil interaction should be considered in the seismic design of long-span cable-stayed bridge. The calculation results of the artificial fitting ground motion and the measured ground motion records of similar sites are quite different, and the most unfavorable load should be taken in the seismic review.