Study On Cable Tension Optimization Of Construction Stages And Completed Bridge State Of Suling Mountain Bridge

The sling component has the important function of adjusting internal force and linear state in bridge structure.At present,scholars at home and abroad have studied the cable force optimization of cable-stayed bridge,and have formed many practical theoretical methods.There are relatively few researches on the optimization of suspender force of arch bridge.It is a question of research value and practical significance whether the cable-stayed bridge cable optimization theory can be directly referenced or improved to be applied to the arch bridge.In this paper,taking the steel girder arch bridge-Suling Mountain Bridge(70m+240m+70m)for the engineering background,we carried out to optimize cable tensions of the construction stage and completed bridge state.The work is summarized as follows:1?Systematically reviewed and categorized various methods of bridge cable optimization theory in recent years,and summarized the advantages and disadvantages of various methods.On the basis of the original theory,the constrained energy minimum method and the influence matrix method are selected,which are used for the cable tensions optimization of the bridge state and the construction stage.2?In Suling Mountain bridge construction scheme and design parameters have been confirmed cases,after calculation and referencing engineering experience,putting forward cables in the construction process for the first time tension control for the corresponding period of every beam 1/2 tensioning method.3?Considering the nonlinear structure theory,adopting the combination of influence matrix method thinking and suiting iterative method and using the consideration of construction stage of Midas/civil finite element model for the construction phase of the second tensioning optimized calculation.The successful realization of all the suspenders only two times can make all the lifting bar force to achieve the desired bridge cable force,reduced the construction cost of the repeated tunings.4?Based on the method of minimum energy constraints,to pull pressure of arch rib and the main girder and the bending strain energy as the optimization goal,the sum of the upper and lower bounds cable force,main arch girder key section of the upper and lower bounds of the displacement and bending moment as constraint conditions,established the reasonable Suling Mountain bridge into the completed bridge state of optimization model.5?The advantages and disadvantages of particle swarm optimization(PSO)optimization are analyzed and improved.On the basis of which an improved particle swarm optimization algorithm(IPSO)is proposed.With IPSO as the main optimization algorithm,MATLAB as the invocation platform software,and the ANSYS finite element model is called,which combines with the constrained energy minimum method to optimize the reasonable bridge state of the Suling Mountain bridge.It is concluded that the bridge optimization is more reasonable than that of the design.