Seismic Vulnerability Analysis Of High Pier Continuous Rigid Frame Bridge Based On IDA Method

With the continuous improvement of China’s infrastructure,more and more Bridges appear in people’s lives.In various bridge structures,high pier continuous rigid bridge has become the first choice of the bridge across deep valley rivers because of its strong applicability,convenient construction,and good economy.When an earthquake occurs,the damage degree of the bridge is an important index to evaluate its seismic performance.Therefore,one of the essential parts of seismic work is to analyze the structure’s vulnerability and evaluate its seismic performance through its damage degree.In this paper,the high pier of a continuous rigid bridge is the research goal,considering the structure of the longitudinal bridge of the axial force,selecting the curvature of the pier control section as the damage index based on the IDA method,considering the vertical and horizontal directions,and analyze the pier height difference and background bridge with the influence of the bridge damage probability,the main contents are as follows:(1)By consulting the previous research results,introduce the concept of bridge vulnerability analysis,summarize the establishment process of the vulnerability curve,and make a detailed summary of each process.(2)establish high pier continuous rigid bridge Midas civil finite element analysis model,extract structure under the action of longitudinal PGA,the pier column key section of axial force time,compared with static axis force,analyze the structure of the dynamic axial force effect on damage index and gives the pier column under the action of the longitudinal bridge moving axial force and transverse bridge to constant load axial force,the judgment of the damage state.(3)The IDA method of dynamic time course analysis of the high pier continuous rigid bridge draws the pier column’s vulnerability curve,calculates the bridge system structure’s vulnerability curve,and analyzes and discusses the internal reasons.(4)Establish the model of two pier columns of the background bridge,change the pier column structure form of the original bridge,adopt the model of a whole box hollow pier model and two pier columns of the entire double pier,and draw the vulnerability curve of the pier column and system structure of the two columns of the two models through the vertical bridge and horizontal bridge to the time course analysis.The influence of the pier column form and the pier height on the damage probability is analyzed.