Analysis On Strength And Stability Of Footbridge Under Working State

Nowadays,with the rapid development of urban construction and the expanding population,the problem of increasing traffic and pedestrian dense has become increasingly prominent,Steel structure pedestrian bridge is a new type of structural style,because of the advantages of steel structure,meeting the development needs of cities and towns,it has been widely used in recent years.Due to the increasing concentration of pedestrians,the load on the steel structure pedestrian bridge is increasing,and its strength and stability are unsure to meet the design requirements.Therefore,in view of this situation,taking steel structure pedestrian bridge car as the research object,the strength and stability of pedestrian bridge car are verified through numerical simulation analysis,a series of optimization schemes are proposed,which provides a reference for the application of such structure in bridge and the evaluation of similar bridges.The details are as follows:This paper introduces the development and current situation of pedestrian bridge car with steel structure,points out the importance of strength and stability analysis of pedestrian bridge car with steel structure,expounds the research on pedestrian bridge at home and abroad,and puts forward the safety of steel structure pedestrian bridge car.Based on the evaluation criteria related to steel structure pedestrian bridge car,the selection of pedestrian bridge car on steel,the size of the model,and the strength and stability analysis standard of steel structure are determined.Using MIDAS software,static analysis of the pedestrian bridge car under working condition is carried out to study the safety and design rationality of the vehicle under static load.The results show that under the normal load when the maximum combined stress of pedestrian bridge box structure bottom bar less than the ultimate stress of the member.,no strength damage and instability damage occur.Again for box end of steel plate thickness,cabinet ministers stem section size and horizontal bar at the bottom of the box section size were analyzed.The results show: at the bottom of the steel plates of different thickness and different section size of the transverse rod for affects obviously the stress of the box structure,but the stress results are less than the limit stress of steel,and different sizes of cross section bar at the bottom had little impact on the frame structure.Finally,Abaqus software was used to conduct a comparative study on the most unfavorable parts of the 30 mm thick steel box and the 10 mm thick steel box,and the bearing capacity analysis of the member under the stress condition is carried out.The research results show that under the normal load,the partial components of the pedestrian bridge car can fully withstand the design requirements of the structural forces and the use of functions.