Analysis Of The Influence Of Tied Arch Bridge Bracing Arrangement On Seismic Response And Wind Load

In our country,with its vast territory,complex terrain and developed water system,the construction of bridges occupies an extremely important position in traffic engineering.With the development of various construction technologies and the optimization of materials and structures,the research on through arch bridges has attracted extensive attention of many experts and scholars.With Zhang Chen and other scholars,the resistance of through arch bridges has been studied.The seismic performance of concrete filled steel tubular structure is considered to be better.Yong He Li and others have studied the random seismic response analysis of leaning arch bridges.They believe that increasing the angle of stable arch ribs and the number of transverse braces can improve the lateral seismic performance of arch bridges.Song Fuchun and other scholars have studied the transverse elastic stability of steel tube arch bridges with truss ribs and basket-lifting Arch Bridges with transverse braces.They believe that proper selection of transverse bracing stiffness can ensure that they do not occur.Local instability can also reduce self-weight.However,the research on seismic response of arch bridges with steel structures in the form of transverse bracing arrangement is rare.Aiming at the corresponding seismic analysis of through arch bridge structure under wind load and earthquake accidental load,how to arrange cross brace can make the force of through arch bridge reach an optimization,reduce the influence of earthquake and wind load to a reasonable controllable range,as through arch.A study of bridges.Based on the engineering background of the Second Youhe Bridge,this paper firstly introduces the development process and current situation of arch bridge,secondly introduces the commonly used seismic analysis methods and wind-resistant design theory,which provides theoretical support for the setting and analysis of transverse braces.Finally,it analyses and compares the optimum ratio of seismic wave and windThe main research contents are as follows:(1)Taking the second bridge of Zuohe Bridge as an example and combining Midas/Civil software,the stress state of through steel arch bridge is analyzed and simulated.(2)Based on the Midas/Civil model,the non-linear time-history analysis of the bridge is carried out,and the seismic response analysis is carried out to compare the displacement and internal force of the transverse braces in the main girder and archribs.(3)According to the wind load simulation of the main girder and the wind load simulation of the arch ribs on the windward side(leeward side),the stress of the main girder and the arch ribs under three different bracing arrangements are analyzed.According to the analysis and comparison of bridges under seismic and wind loads,the crossing arrangement of cross braces at the vault roof can improve the structural stability to a greater extent.At the same time,the arrangement of cross braces at the top of arch ribs can simplify the sense of depression of high suspension on the road.The structural effect of cross braces can enhance the stiffness of through arch bridges and restrain the arch ribs.Torsional deformation has a great influence.