Research On Increasing Section Method Of Masonry Arch Bridge Based On Large Transport

Bulk transport plays an increasingly important role in the current road transport.In all the roads,the bulk car mainly through the second and third level of low-grade highway,these roads use a lower level of design load standards,and highway masonry arch bridge is the low-grade road bridge one of the most important bridge.Therefore,it is very meaningful to evaluate the bearing capacity of the masonry arch bridge and the research of reinforcement.Increasing the cross section reinforcement method has the advantages of obvious reinforcement effect,high economic efficiency,convenient construction and quick application,and extensive use in old bridge reinforcement.Therefore,this paper studies the bearing capacity of masonry arch bridge and the reinforcement of cross section method.The main work is as follows:Firstly,the bearing capacity evaluation and checking method of bridge are studied.Taking into account the large car moving load for the impact of the bridge is very large,different speed of the large car will have a different impact on the bridge,so large cars in the bridge when the vehicle speed should be strictly limited.This paper studies the bearing capacity of bridges from the aspects of traffic speed limit,assuming that the road surface is better and only the vehicle speed is the research object.Based on the finite element model of a certain arch bridge,the dynamic response of the bridge under different vehicle speed is analyzed and calculated by using the transient dynamic analysis method,and then the corresponding impact coefficient is deduced.According to the analysis of the impact coefficient,summed up the bulk of the bridge when the speed limit,that is,to 5km/h uniform bridge the most appropriate for the actual road and bridge transport transport control to provide speed limit reference.Finally,based on the large speed limit bridge,this paper puts forward the method of checking the carrying capacity based on the live load comparison method and the actual load checking method.Secondly,this paper analyzes the internal force and stress of the old bridge before and after the reinforcement of the old bridge,and analyzes the effect of the reinforcement.At the same time,the load capacity of the reinforced concrete bridge is evaluated by the static load test.Carrying capacity to meet the requirements of large transport.Finally,in order to further study the effect of increasing the cross-section method,considering the effect of increasing the cross-section reinforcement position and the reinforcement thickness on the reinforcement effect,the arch arch,Section reinforcement for modeling calculation,the internal force,stress values were compared.And then summarizes its reinforcement effect and sensitivity,which provides practical guidance and reference for the application of this method in actual reinforcement engineering.