Seismic Response Analytical Method For Bridge Structure-Based Seismic Design

Earthquake is a kind of natural disaster which is difficult to predict and the damagedegree is very great,occurrence of the strong motion often leads to the tremendous lifeandproperty loss。Structural failures in recent earthquakes have exposed the weakness ofcurrent design procedures and shown the need for new concepts and methodologies ofseismic performance evaluation for building structures。To meet needs of engineeringdesign,based seismic design method was developed,it can be achieved mainly byPush-overanalysis。Push-over analysis can get more information than static elastic analysisand easy to operate。Currently the Push-over analytical method is mostly applied at construct thestructure,show the advantage of easy to understand。as the key positions in thecommunication and transportation system,Once Bridge Structure are destroyed inearthquakes,there will be great difficulties for the emergency managements and bridgesrestoration, It have the important meaning that Push-over analytical method apply to thebridge anti- earthquake design。In this dissertation ,the first,The basic theories,step of analysis about Push-overanalysis method are systemically discussed。the principe of the capacity spectrum arediscussed The inelastic response demand spectrum of four site condition is gotten byemployed Vidic's strength reduction factors method based on response spedtrum ofChinese code for different engineering seismic resistance design, The inelastic responsedemand spectrum can be employed to Calculate real bridges structural seismic resistancecapacity。Secondly,use single tower cable-stayed bridge of four steel wires face which is themain bridge of nancangdao interchange of the fast road engineering on the city center cityarea in Tianjin city,is the engineering background,making use of the large and in generaluse software ANSYS,got the motive characteristic of the model,the bridge structure isassessed by the nonlinear time-history analysis procedure,the capacity of bridge structures is developed;carried on the Push-over analysis to the bridge,the results of two method is nearby the same, show the accuracy of the Push-over method。It showed that the Push-over method not only has the advantage of the image, keeps the view and easy to understand ,but also have the same accuracy as the time-history analysis。...