Analysis Of Vehicle Safety Under Cross Wind On The Road Bridge

Because the bridge is often in the valleys or the surface of the ocean,the deck wind field is relatively complex,the typhoon,tornadoes,thunderstorms happen all the time,the weather will be accompanied by strong winds,with the relative higher position,Cross winds on bridge deck is much larger than the ground or sea level.Therefore,the wind on both sides of the bridge is likely to affect vehicle’s safety and cause accidents.So,it is very important to study the wind environment of bridge.This paper analysis the existing literature on the research achievements of bridge cross wind,on the basis of the research achievements,study the safety of driving under the side wind of bridge.By comparing the variety of existing models,taking the accumulation of more typical models as the research object,analyze the parameters of the models of aerodynamic force correlation.Study different bridge ramp at the same time,curve parameters,adherent rate and related parameters,selection of suitable simulation numerical,then according to the selection of related parameters of the analysis of the vehicle on bridge deck skid and roll the stress of the two cases,two kinds of state boundary condition is given.After the analysis of the windbreak structure on bridge deck wind environment and the influence of the aerodynamic force,this paper uses fluid mechanics software to simulate the deck wind environment on the bridge.studied the windbreak leak rate,the number of windbreak and windbreak shape bridge wind speed influence coefficient and the influence of the aerodynamic force on bridge deck,the study found that,with the increase of height of windbreak drag coefficient increasing trend of the structure of the bridge and the increased lift coefficient is negative.Through contrast the main girder bridge deck on the numerical simulations of the flow around,and carries on the statistical analysis of wind field on bridge deck,and the traffic on the bridge deck is wind conditions,determine the scope of the mountainous area highway bridge safe driving of surface wind speed.after using numerical simulation of wind environment of windbreak and bridge,the bridge of wind tunnel test,wind environment through test vehicle aerodynamic parameters of various operating conditions on safe driving wind speed under different ventilation curtain set are analyzed in comparison.The results of the study has certain reference meaning for bridge safety management,and at the same time the research related windbreak conclusion can provide reference for the setup and selection of bridge windbreak,to ensure the safety of highway bridge crane,raise the level of road traffic safety operation.