Research The Methods Of Cable Force Design And Construction Control On Special Single Tower Concrete Cable Stayed Bridge

In recent years,many designers designed a variety of special-shaped cable-stayed bridge,thus,the role of the bridge is not limited to the transportation of more given its landscape.Always,the complexity of the terrain make the span asymmetric in single tower cable-stayed bridge.These conditions will increase the difficulty of force analysis for cable-stayed bridge.The force of cable-stayed bridge is complex,and many construction processes.The cable force of the cable-stayed bridge is a crucial role in the rationality of the bridge.So a reasonable bridge design cable force and reasonable construction cable tension are very important to cablestayed bridge.And cable-stayed bridge is still a lot of problems.Such as: because the finite element analysis software is not fine enough,in the establishment of the calculation model the error of selected parameters and the actual parameters,causing the construction results and design expectations are not closed;cable force design unreasonable lead to the main beam deviation from the design requirements,The process is cumbersome,time-consuming and inefficient;construction monitoring methods are not perfect,so that the construction process of the guidance is not enough,resulting in construction errors and other issues.Based on the Riverside Bridge,this paper studies the cable force design method and construction control method of cable-stayed bridge,and compares the characteristics of various methods.According to the technical scheme of Riverside Bridge,a reasonable cable force design method and construction control method are selected for practical construction guidance.In order to improve the cable-stayed bridge and the optimization of the cable force,the construction error of the cable-stayed bridge is reduced,the construction control effect of the cable-stayed bridge is improved,and the construction quality of the cable-stayed bridge is ensured.Based on the existing research results,the finite element analysis software MIDAS-CIVIL is used to establish the full-bridge finite element model.Under the action of the bridge load and the second stage live load,the feasible method is selected according to the actual situation of the bridge.after force optimization.Based on the comparison of the cable force and the dead load and the two-stage live load to calculate,and compared the reasonable shape and force and the main force of tower with the calculated results.Guiding the design of Cable Force.In this paper,the rigid beam support method,the minimum bending moment method and the influence matrix method are used to optimize the cable force of the bridge.The Upright iteration method is used to optimize the tension of the stay cable under the different working conditions.Reduce construction error.Using adaptive monitoring method to carry out the bridge constructio n monitoring,through the construction site measured data of the specific circumstances,do a detailed analysis.Real-time follow-up construction records,from the construction phase of the problem to predict the construction phase of the error,according to the error situation to amend the relevant parameters and construction details.To ensure the quality of construction.Through the study of this paper,we can see that the rigid continuous support beam method,the bending energy minimum method and the influence matrix method are used in the optimization of the cable force of the special-shaped single-tower cable-stayed bridge together integrate,and the optimization effect is good.In the process of using the bending energy minimization method to determine the initial bridge state,the CIVIL is used to enlarge the cross-sectional area of the pylon beam by 100 times and the axial stiffness is constant.The initial cable force distribution is uniform.The combination of matrix method and upright iteration method to determine the tension of stayed cable can solve the nonlinear problem of cable-stayed bridge and solve the linear problem between cable forces.In the cable force optimization of cable construction.Solving the least square solution of the optimiza t io n equation by using MATLAB can improve the optimization efficiency.In order to ensure the safety of the structure,through theoretical analysis,adjust the sequence of cable tension reasonable can ensure the safety of the beam,and avoid the much tensions and saving time,solve the problem of the large tensile stress in main beam,correct and accurate guidance construction.So that made the final bridge state to meet the design requirements.