Dynamic Analysis Of Rigid Hinge In A Multi-Span Cable-Stayed Bridge

Long-span bridge plays important roles in economy as well as in daily traffic. Once it is destroyed by earthquake, it will cause great economic losses and enormous difficulty in the recovery of post earthquake. Thus, correct and effective analysis on the cable-stayed bridge and its key components’reaction to earthquake has a great significance for ensuring the structure’s safety in the earthquake.This paper basing on the theories of seismic response, aims to research a long-span six-tower cable-stayed bridge and rigid hinge’s seismic response by time history method and consider non-uniform excitation. This paper mainly contains the following aspects:1. The present studies on bridge seismic resistance and multi-tower cable bridg, multi-support excitation seismic response analysis method and its equation of motion will be discussed;2. Use of multi-support excitation time history method to analysis the dynamic response of the six-tower cable-stayed bridge with a rigid hinge, and demonstrate the need for further analysis of the rigid hinge, in order to make preparation for the local dynamic analysis of rigid hinge, acceleration process of its key points under four kinds of seismic waves will be recorded;3. The finite element program ANSYS will be applied to establish a finite element spatial analysis model of cable-stayed bridge with rigid hinge, establish appropriate boundary conditions to meet the mechanical characteristics of the rigid hinge, take the key points’ acceleration schedule of the overall analysis as input parameters,and then make time-history analysis of rigid hinge by high-mass method in the Ansys;4. This paper aims to explore the effect of traveling waves on the stress of rigid hinge and analyze its weak points to find out the most possible place for damaging, evaluate the safety and rationality of rigid hinge structure, to provide theoretical basis for the designing and normal use of long-span cable stayed bridges with rigid hinge from the perspective of seismic resistance.