Analysis Of Earthquake Vulnerability Of The High Pier And Short Tower Cable-stayed Bridge

Based on the analysis of the vulnerability of the high pier and short tower cable-stayed bridge under earthquake,this paper uses the incremental dynamic analysis method based on the seismic vulnerability analysis theory to consider the effect of seismic wave traveling wave on the high pier and short tower cable-stayed bridge.Under the issue of seismic vulnerability,the research on seismic vulnerability under the action of uniform longitudinal excitation and multi-point excitation of longitudinal bridge is carried out.The main research contents are as follows:(1)Combining the mechanical characteristics of the high pier and short tower cable-stayed bridge and related research results of seismic vulnerability theory,to explore the problems in structural vulnerability analysis of the high pier and short tower cable-stayed bridge under random ground motion Clarify the problems that should be solved when conducting seismic vulnerability analysis on the high pier and short tower cable-stayed bridge,and determine the goals,content,and methods that need to be studied.(2)Based on the analysis of the seismic performance of the high pier and short tower cable-stayed bridge,the seismic analysis method suitable for the high pier and short tower cable-stayed bridge is determined,that is,the incremental dynamic analysis method is adopted for the seismic response of the high pier and short tower cable-stayed bridge Analysis,and comprehensively summarize the damage criterion and damage index in the process of using the incremental dynamic analysis method,and provide the theory and method for the seismic vulnerability analysis of the high pier and short tower cable-stayed bridge.(3)According to the structural characteristics and seismic response behavior of the high pier and short tower cable-stayed bridge,the constitutive relations of elements and materials involved in the finite element modeling of the high pier and short tower cable-stayed bridge are selected,loads,boundary conditions and The pile-soil interaction simulation and other issues are summarized in detail;the strong earthquake database provided by PEER is used as the basis for wave selection,considering the random characteristics of ground motions,determining the principles and methods for selecting random ground motions,and considering the effects of traveling wave effects for ground motion The seismic vulnerability analysis of the high pier and short tower cable-stayed bridge underneath lays the foundation.(4)Based on the theory and method of seismic vulnerability analysis of the bridge structure,the selected 12 amplitude-modulated seismic waves are respectively launched along the longitudinal bridge in the direction of uniform excitation and seismic vulnerability analysis under multi-point excitation to carry out safety for the actual project At the same time,it provides guidance for the remedial measures of similar bridge structures under different damage states,and finally provides reference for the seismic performance evaluation of high-pier and low-stay cable-stayed bridges based on the calculation and analysis results.