Study On Mechanical Performance Of Pedestrian Suspension Bridge With Different Suspenders

Pedestrian suspension bridge structure has the characteristics of good mechanical performance,large span,strong seismic resistance,beautiful structural shape.Therefore,in recent years,pedestrian suspension bridge has become a hot spot in various scenic spots.But the design of pedestrian suspension bridge mostly adopts the design theory and specification of highway suspension bridge,and the theory of pedestrian suspension bridge needs to be improved.Based on the long-span pedestrian suspension bridge in a scenic area,the finite element model of two kinds of pedestrian suspension bridges with different suspenders is established by using midas/civil finite element analysis software.The static,dynamic and comfort of the two suspension bridge models are compared and analyzed.Finally,the vibration control of vertical suspender model is carried out to ensure that the pedestrian is in a comfortable state when crossing the bridge.The main contents of this paper are as follows:(1)By applying two kinds of crowd load,the stress state of each component of the bridge structure is determined.The stress characteristics and displacement variation law of main cable,suspender,wind resistant cable and main beam are summarized,and the influence of different suspender forms on suspension bridge components is obtained.(2)Based on the eigenvalue analysis of two suspension bridges with suspenders,the lateral and vertical accelerations of main girder under each vibration order including pedestrian mass and without pedestrian mass are obtained.(3)According to the German en03-2007 pedestrian bridge specification,the maximum acceleration of the main beam node under each vibration order of the two models is determined and the comfort evaluation is carried out.(4)According to the results of comfort evaluation,the vibration reduction of vertical suspender model is analyzed.By setting up multiple tuned mass damper(MTMD)system,the vibration reduction effect is obvious,and the pedestrian is in a moderate comfortable state.Therefore,MTMD system can be used as a good vibration reduction measure in long-span suspension bridges.