Study And Optimization Of The Mechanical Behavior Of The Cable-Stayed Bridge

The stress state of the curved vase-shaped main tower is complex,the internal force has a great influence on the construction of the structure,and the spatial effect is obvious.The stress of the bridge tower directly affects the stability and safety of the cable-stayed bridge.In order to ensure that the force,line shape and stress of the tower are satisfied during the construction process and after the completion of the bridge,it is necessary to carry out every stage of the tower construction.Perform rigorous calculation analysis and monitoring,and adjust and optimize measures as necessary.In this paper,a curved vase-shaped bridge tower cable-stayed bridge over the Lancang River Bridge in South Anhui was used as the engineering background.After the plane analysis,the space tower physical unit simulation analysis was performed.The stress distribution and development characteristics of the curve-shaped vase-shaped tower are The overall grasp;Quta in the construction process there is a large eccentricity effect,under the bridge working conditions,using the minimum strain energy method,the minimum bending energy method to optimize the number and location of the tower column prestressing,to optimize the force during the construction phase for the purpose of adjusting the tower column pre Parameters such as stress stretching time,pre-stress curvature,temporary cross bracing,and local pre-stress are used to obtain the results of the stress of the vase-shaped pylons.The actual stress of the monitoring is compared with the theoretical stress in the model to verify the reliability of the theoretical calculation and the optimization measures.Accuracy,so as to provide reference for the design and construction of the same type of tower structure.The research content of this article includes:(1)This paper introduces the basic theory of cable-stayed bridge analysis and the necessity of spatial analysis for the pylon of cable-stayed bridge with complex structure,and introduces the finite element MIDAS/FEA calculation software of large space entity;The stress state of the curved vase-shaped bridge tower is complex,the structure safety and the linear control are difficult At the same time,the bridge tower construction process and the force state of the bridge affect the safety and stability of the whole bridge,in order to ensure the pylon in the construction process and after the bridge does not appear the undesirable stress,puts forward the construction monitoring necessity,and introduces the construction monitoring content.(2)Based on Minnan Minjiang Bridge,the Midas/Civil calculation software was used to establish the full-bridge finite element calculation model.The installation sequence of the main beam was used to perform full-scale calculation of the full-bridge,and the static structure was obtained.Situation,data of cable tension after completion of bridge,etc.;proposed the eccentricity effect of the tower,and the Midas/Civil calculation software used the minimum strain energy method and the minimum bending energy method to calculate the number and position of the tower prestress.Optimized design;Through Midas/FEA space calculation software,the internal force distribution and stress development trend of the bridge tower cable-stayed bridge in the entire construction process and the prestressing force of the beam were analyzed in detail.The tower's own space stress characteristics and key areas of focus are overall grasped.(3)According to the stress distribution of curve-shaped vase-shaped towers,the stress-influencing parameters of the towers are analyzed,and the number of prestressing tendons,the timing of prestressing,the pre-stressed curvature,and the temporary cross-support are adjusted for the purpose of optimizing the force of the tower.The parameters get the optimized results of the curve vase column.(4)Through monitoring the stress of the tower during the construction process,the monitoring data is compared with the theoretical values to verify the correctness of the optimized design of the force and to provide reference for the design and construction of the same type of tower structure.