Single Column Pier Bridge Lateral Vibration Analysis

Single column pier of continuous beam bridge is often adopted in cityoverpass bridge,in order to minimize the ground traffic,diameter of the piershould be limited, Bridge transverse spacing decreases, the stability coefficientis lower. Bridge as a lifeline project once destroyed in the earthquake, theoccurrence of secondary disasters, serious impact on the post earthquake reliefwork and people’s life and property safety.Thus, the seismic isolation design isnecessary for the bridge structure.Earthquake disaster occurred nearly100years show that, the destructionof bridge earthquake is not only from the longitudinal direction of the bridgegirder falling and damage, There are many shear beam falling and pier fromthe transverse direction of the bridge damage. For example, Kobe earthquakeand the earthquake in Wenchuan, There are a lot of overpass bridge damage isdue to transverse earthquake. Lateral stability overpass single column pier ofcontinuous beam, so the seismic design should arouse our attention.In this paper, Changchun City Road overpass bridge as the engineeringbackground, dynamic analysis model of bridge by using the finite elementsoftware MIDAS CIVIL, shock absorption analysis of bridges, the mainresearch contents are as follows:(1)The steel ball bearing, the laminated rubber bearings and lead rubberbearing three different bearing conditions, based on the dynamics theory of theanalysis model is established for three kinds of power. According to the"guidelines for seismic design of highway bridges" vibration isolation designof bridge structure.Studied the response of the bridge structure under the effectof E2earthquake,Looked at the bridge in the three different kinds of bearingsin response spectrum analysis results,analyzes and compares the results,andfind the rule. (2)To set up three single column pier overpass dynamic model fordynamic time history analysis,study on transverse earthquake,the mechanicalcharacteristics of three span single column pier continuous grider bridge pierswith longitudinal slope,there is also the question of bridge seismic designfocus attention.The result of the response spectrum analysis and time historyanalysis compared,two kinds of method to calculate the bridge seismicresponse results the error is within20%,meet the requirements of thespecification.