Study On The Characteristics Of Dynamic And Seismic Response Of The Suspension Bridge With Long Span

Modern suspension bridge is a large soft and highly non-linear bridge structure ofthe rope suspension system,because that has the advantages of large spanning capacityand sleek structure, this structure becomes the first choice for long-span bridges. Thisclassic bridge load-bearing components is suspension, boom and the main tower, themain tower bear the full weight of the bridge and vehicles, wind load and other externalloads,so its safety is the top of the security of the whole bridge. Earthquake loads, windloads, the movement of vehicles and load power incentives have the strong sensitivity,therefore, the dynamic performance of suspension bridge is one of the structural designof critical control steps.This paper with Longjiang bridge as the engineering background builds theestablishment of a sound suspension bridge dynamic characteristics analysis of thespatial finite element model. Dynamic analysis of suspension bridges must determinethe staticequilibrium position and internal force state, therefore, this paper based onsegmental catenary theory, established a suspension bridge to bridge calculation ofmain cable curve iteration, the last make procedure finds out analysis of suspensionbridge main cable into the bridge alignment calculation. In addition, are alsoconsidering pile-soil interaction and not considering pile foundation two conditions forthe suspension bridge static and dynamic characteristics were calculated, and the twomodel of the dynamic characteristics of a comparative analysis,and draw someimportant conclusions.Through this article to the suspension bridge seismic response analysis of thedemonstration, the expectations are implemented that provides the reference of seismicdesign of suspension bridge, that want to master and understand the seismic response ofthe bridge designers provides case, at the same time for designers build reasonableseismic system, take effective measures provide a scientific basis. Study of the bridgeseismic response of the bridge seismic design theory can be rich, can also provide thebasis for identification of bridge reinforcement, so it has important practicalsignificance.