Construction Control And Simulation Of Cable-Stayed Bridge With Large Cantilever Box Girder

Extradosed cable-stayed bridge is a new type of bridge structure which is developed in recent years.In terms of structural characteristics,extradosed cable-stayed bridge is a bridge between continuous girder bridge and cable-stayed bridge structure.Based on the characteristics of light structure and beautiful appearance,the bridge is developing rapidly at home and abroad.In order to ensure that the linear and internal forces of the bridge meet the design requirement and construction safety during construction,the bridge construction must be monitored.This paper,based on the project background of xiangjiang extradosed cable-stayed bridge in dongzhou,hengyang,mainly completed the following contents:(1)This paper introduces the origin of the cable-stayed bridge,the development status at home and abroad,and the characteristics of the extradosed cable-stayed bridge.And then this paper expounds the importance of low tower cable-stayed bridge construction monitoring work and introduces the development course and the construction control of the construction monitoring system.This paper briefly summarizes the purpose and importance of construction control.(2)The construction control method,structure calculation method and error adjusting method of the extradosed cable-stayed bridge are studied.The control theory and method of this bridge are determined to ensure that the bridge construction meets the design requirements.(3)This paper introduces the main content of the construction control and the points of attention in the construction process of the pylon cable-stayed bridge in xiangjiang,dongzhou.(4)Using the Midas/civil fem software to build a bridge calculation model,it is the standard to consider the width of the effective wingspan and the internal forces and deformations of each construction phase.The effect of the effective flange width on the calculated results was compared and analyzed.The sensitivity of the design parameters is analyzed and the displacement of sota in each construction stage is studied.Determine the formula of the elevation calculation and calculate the precamber and precamber of the construction.This paper studies the changes of the cable-stayed cable force in each construction stage,and provides the theoretical method for the optimization of the cable forces,which provides a solid theoretical foundation for the actual construction.(5)The simulation software Midas/FEA was used to establish the zero block entity model.The transverse stress analysis of large cantilever under deflection load is carried out.Research under the maximum cantilever state and state into a bridge,the longitudinal and transverse normal stress and principal tensile stress and normal stress principal compressive stress at the top,bottom,web,and the distribution of transverse diaphragm,check whether there is the possibility of cracks.In the zero block construction and the completion of block one construction.The theoretical simulation results are compared with the field measured results,and the two are in good agreement,and the correctness and reliability of the theoretical calculation are verified.It is possible to predict the local stress distribution in the following construction stage by establishing a larger entity model and to guide the actual construction.Ensure the safety of bridge construction and reasonable bridge.