Long-span Bridge Seismic Response Analysis

Currently, the earthquake is one of the most serious natural disaster to endanger people.And predicting the earthquake is a hard nut to crack of world at the same time. So carring onseismic response analysis of structure，which finds damageable parts， becomes moreimportant to the structure of quakeproof and to reduce the disaster, on the bridge structureparticularly. Because whether the bridge structure is safe is close to connect with theunimpeded roads, national property and personal safety. The bridge structure is the importantpart of constituting the lifeline system, is the vital point structure of the transportation, and isplaced in the very and important position in anti-shake relief. If the bridge structure in theearthquake severely damaged or collapsed, its repair, restoration difficulty is much greaterthan the other structures.According to the above-mentioned reason, to carry on seismic response analysis aboutlong-span bridges becomes very meaningful. This article makes use of finite element method,the IDA analysis to combine together with nonlinear time history analysis, carries on seismicresponse analysis of a long-span continuous rigid frame bridge. The main contents are asfollows：（1）Make use of a procedure OpenSees，build up finite element model of long-spancontinuous rigid frame bridge，and carry on nonlinear finite element time-history analysis ofbridge model to find damageable parts of bridge model. During the analysis process，makeuse of Excel VBA to write a program on dealing with datas.（2）Make use of incremental dynamic analysis to adjust the importation of theearthquake wave，Each of the seismic peak acceleration will be adjusted to0.1g. Afteradjusting the seismic waves，the seismic wave input to the model for seismic responseanalysis.（3）Under the condition of keep others conditions of bridge model, increase overallheights of piers to carry on nonlinear time history analysis，come to the conclusion ofdamageable parts of bridge model.