Nonlinear Analysis Of Hollow Slab Bridge Strengthened By External Prestressing

With the increase of traffic volume and the increasing problem of vehicle overload,there are more and more problems of bridge diseases,which result in the decline of bridge carrying capacity,which threatens the development of our economy and the people's life and property.Bridge damage is inevitable,so the bridge maintenance and reinforcement is one of the most critical part of the bridge construction project.The method of repairing and strengthening the bridge commonly used in engineering is the external prestressing reinforcement method.The external prestressing reinforcement method can not only be used directly in the new construction,but also is suitable for the maintenance and reinforcement of the old bridge.It has the advantages of not affecting the traffic,the flexible arrangement of the cable can be exchanged,convenient maintenance,and the bearing capacity of the bridge can be improved for a long time.Experts and scholars at home and abroad have done an in-depth study on the system of external prestressed reinforcement.However,the current study on the folding linear in external prestressed hollow slab bridge is not very adequate.In this paper,the failure test of the hollow slab bridge is carried out.Simulation analysis of hollow slab bridge with external finite element software ABAQUS.The stress state of the hollow plate bridge in the process of external load is strengthened and the different steering Effects of Block Radius and Anchorage Position on External Prestress Reinforcement.Based on the finite element modeling and analysis of the existing T-beam test,it is proved that the concrete smeared crack model is reliable.The influence of the placement shape,the anchoring position and the number of the steering block on the external prestressing reinforcement of the external prestressed tendons in vitro is considered.In this paper,the effect of different height steering block and different anchoring position on the effect of strengthening single hollow slab is studied,and the reasonable turning block height and anchorage position are obtained.The finite element software ABAQUS was used to analyze the hollow slab bridge nonlinearly with the failure experiment of Dong meng jiang nv Bridge.The stress state of the hollow slab bridge under external load and the stress state after the external prestressed reinforcement were simulated.Through the comparison and analysis of the simulation results before and after reinforcement,the load deflection curve and stress curve of the hollow slab beam are obtained.It is proved that the prestressing method can obviously reduce the deformation of the bridge and improve the bearing capacity of the bridge.