The Slide Mechanism And Treatment Of Large Longitudinal Slope Of Girder Bridge

This paper mainly analyzes and studies the sliding mechanism and disposal countermeasures of the large longitudinal slope girder bridge.The first three chapters analyze the sliding mechanism of large longitudinal girder bridge.First of all,the main research content and direction of this paper are formulated by investigating the research status at home and abroad.Then,the working mechanism of the support and the influence of vehicle acceleration and braking load on the large longitudinal slope girder bridge are analyzed theoretically,and the finite element software is used to establish a model for calculation and analysis.The main reasons for the longitudinal slide of the large longitudinal slope girder bridge are found to be related to the void of the support,temperature effect,vehicle acceleration and braking.Through the study,the following conclusions are drawn: ○1 The working state of the large longitudinal slope bridge support mainly includes two stages: shear deformation and friction slip;○2 Vehicle-bridge coupling vibration has little effect on the longitudinal displacement of the bridge;○3 Temperature change has a certain effect on the slide of the main girder;○4 The bearing void has a great influence on the main girder’s downward slide.The fourth chapter is the study of large longitudinal slope bridge disposal countermeasures,by collecting data,studying the large longitudinal slope bridge in prevention and treatment of countermeasures,from the longitudinal linear optimization of bridge design,the design optimization of pier girder consolidation,limit design can effectively avoid this problem,if the large longitudinal slope bridge appeared sliding situation,Can take the main girder reset,replace the support and other measures to solve the problem;In addition,increasing the width of the cover beam at the expansion joint can effectively reduce the risk of the beam body falling,which is conducive to the safety of the structure.Finally,combined with the analysis of the engineering case,the restoration method and monitoring points of the case bridge are introduced.