Seismic Response Analysis Of (74+160+74)m Continuous Beam-arch Bridge

Compared with common continuous beam,the continuous beam-arch bridge has the obvious advantages of large span capability,high bearing capacity,good seismic performance and fast construction progress,which are widely used in engineering area.Judging from the previous data,the research and specifications related to seismic resistance of continuous beam arch bridges are not yet mature,So this paper takes the(74+160+74)m continuous beam-arch bridge of Zheng wan Railway as the research object,the seismic analysis model of the bridge is established by the finite element software Midas,and the seismic response analysis under the frequent earthquake and rare earthquake is performed,the main work is as follows:(1)The characteristic,application and research development of concrete-filled steel tube arch bridge and the mechanism,forms and seismic development of earthquake damage is analyzed.(2)The key parts of continuous beam arch bridge are modeled and the interaction method between pile and soil is simulated.The finite element model of full bridge is established by Midas Civil,and the dynamic characteristics of the bridge are analyzed.(3)The displacement,internal force response law of arch ribs,main girders and bridge piers under longitudinal earthquakes,lateral earthquakes and vertical earthquakes are studied to analyze the mechanical characteristics of the members by response spectrum analysis method.(4)Three reasonable seismic waves are selected and the seismic responses of the components under frequent earthquakes are studied using time-history analysis.The results of time-history analysis are compared with those of response spectrum analysis and the applicability of the two methods is analyzed.(5)The plastic hinge is established at the bottom of the pier to analyze the seismic response of the continuous beam arch bridge under rare earthquakes,and to study the safety of piers under rare earthquakes by the dynamic elastoplastic analysis method,.