Dynamic Analysis On Qingcaobei Super-large Suspension Bridge

Suspension bridge is one of the bridges with greatest spanning ability. Along withthe improvement of bridge construction and increasement of span, the power problemother than static problem is more prominent. The suspension bridge is a structure easyto vibrate, the cable is of great flexibility and the effect of non-linear factors issignificant, hence under the earthquake load, wine load, vehicular load and otherdynamic motivation, the bridge structure have obvious dynamic response. Thus, theanalysis of the dynamic properties of suspension bridge is of certain reference value forgetting well knowledge of its mechanical characteristics, the optimization design ofbridge and engineering practice.This paper makes an exploration and research basing onFuling Qingcaoibei Yangtze River Bridge and dynamic characteristics analysis ofsuper-large suspension bridge.This paper mainly studies the following contents:â‘ Systematacially deduce the computation theory of dynamical analysis ofsuspension bridge for providing powerful theoretical basis of computing and analyzingdynamic response of suspension brige. Meanwhile, briefly summarize the analyzingprocess of suspension bridge by finite element software Midas/civil2010, anddemonstrate its adaptability.â‘¡Through the real simulation of structure, such as cable systems, bridge deck,main column tower, and so on, establish the dynamic analysis model of suspensionbridge. On this basis, to get the natural frequency of vibration, natural period ofvibration and vibration mode of corresponding order for Qingcaoibei Yangtze RiverBridge and further to demonstrate its correspondence to the self-vibration law of similarbridges.â‘¢Moreover, carry out the impact analysis of dynamic parameters by modifyingpartial parameters of suspension bridge, such as stiffness of stiff girder, main columntower, and dead load of bridge deck, to come to a conclusion. And then, change thesimplified simulation mode of stiff girder, to analyze the effect of different simulationmode for self vibration characterics of suspension bridge and demonstrate the feasibilityof various simulation modes.â‘£Through the earthquake response analysis of suspension bridge, combining theinformation of longitudinal+vertical and horizontal+vertical, mutural check betweenresponse spectrum analysis and dynamic time-history analysis, to preliminarily estimate the earthquake resistant behavior of Fuling Qingcaoibei Yangtze River Bridge andpropose to add reinforcing bars for section of tower bottom in aseismatic design.