Research On Stress Distribution And Construction Control Of Concrete Double Side Box Girder Cable Stayed Bridge

Based on the construction of Langzhong the fourth Jialing River Bridge using finite element software MIDAS/FEA entities of the whole bridge model is established,bilateral of concrete box girder cable-stayed bridge construction stage was calculated.From the deformation and stress of main girder and cable force analyses,makes up for the traditional plane truss analysis on the space is insufficient,and through the calculation results of bilateral box girder construction control provides theory basis,further perfect the construction monitoring scheme.This article main research content includes:(1)After consult relevant literature,this paper introduces the modern of the cable-stayed bridge concrete girders section form and its characteristics,as well as the concept,the development of the construction control and content.(2)Using finite element software MIDAS/FEA langzhong jialing river four main bridge entity model is established,and according to the actual construction schemes for the construction phase of formal analysis,the main girder during construction in the process of deformation and stress state,the cumulative deformation of phase and the cable force,analysis on the space distribution characteristics.(3)Introduced the four langzhong jialing river bridge construction monitoring precision and general requirements,according to the entity model calculation and analysis of main girder deformation law,puts forward its main girder camber control method in different locations section respectively,is different from the past using the same at a cross section camber,provide a reference for the same type of bridge construction control.(4)According to the main girder stress state of the cantilever stage,in the most unfavorable section is installed on a larger stress strain gauge,the monitoring of the main girder stress situation.This paper introduces the general method of cable force measurement and characteristics,and details the vibration method,the operation of the matters needing attention.Summarizes the influencing factors of deviation of cable tower and rectification method.