Design Of Strengthening Scheme And Comprehensive Optimization Analysis For Urban Concrete Bridges

With the increase of the service life of bridges and the increasing traffic volume in cities,the safety and reliability of urban bridge structures are continuously decreasing,which makes the carrying capacity of most bridge structures generally lower and various diseases appear.These bridges can no longer meet the requirements of the rapid development of cities and greatly restrict the development of cities.On the other hand.For the same bridge,there will be different reinforcement schemes,so the optimization of reinforcement scheme is particularly important.Through continuous optimization of the scheme,not only can construction funds be saved and construction period be shortened,but also traffic and social impacts can be reduced.Based on the analysis of the third major disease and bearing capacity of a city bridge,this paper designs two reinforcement schemes,establishes an optimization analysis model for the comprehensive impact quantity of city bridge reinforcement,carries out comprehensive optimization analysis on the reinforcement schemes,determines the optimal scheme,and verifies the accuracy and feasibility of the designed reinforcement scheme and optimization analysis method through the implementation of the optimal scheme.The main research contents are as follows:(1)According to the third part disease of the bridge,the causes of the disease were analyzed firstly,and then the structural checking calculation was carried out,which verified that the shear bearing capacity of the section did not meet the requirements and the width of the section crack exceeded the limit.(2)In view of the insufficiency of its third part bearing capacity,two maintenance and reinforcement schemes are proposed,one is to demolish and rebuild its upper structure,the other is to adopt structural reinforcement,that is,to increase its bearing capacity by increasing its cross section and external prestressing.(3)It is verified that the structural reinforcement scheme can improve the bearing capacity of the third box girder,increase the structural safety,reduce the crack and deformation development in the later stage of the girder,and meet the requirements of normal use.(4)Establish a comprehensive optimization analysis model,analyze and demonstrate the two schemes from six aspects such as construction cost,construction period,traffic impact,social impact,service life,and bearing capacity improvement ratio,quantify the impact factors,and determine the optimization scheme by analyzing the comprehensive impact value of urban bridge reinforcement optimization.(5)Use the optimized reinforcement scheme to reinforce the bridge,and verify the accuracy of the optimization results and the necessity of the scheme optimization through the implementation of the scheme.