The Analysisof Reasonable System Of The Long-spancable-stayedbridge With Hybrid Girder And The Nonlinear Analysis Of The Construction Process

When the bridge into the era of large-span, the geometrical nonlinear problems must be considered in bridge design and construction. With reference to JingYue Yangtze River Highway Bridge, we do a in-depth study in reasonable system of cable-stayed bridge with hybrid girde, and the geometrical nonlinear factors during construction of super long span cable-stayed bridge。The main contents of the research as follows:(1)Base on the ideal conditions of dead load, a reasonable system of cable-stayed bridge with hybrid girder were discussed. Established Calculations of a rational side in the cross-ratio, the minimum tower height, minimum angle and the ratio of two-tower high; discussing how to setting Supporting pier. Therefrom,use them to analyze the rational system of the JingYue Bridge including the reasonable side in the cross-ratio, the minimum tower height, minimum angle, two-tower high ratio , setting auxiliary piers,ect,and put forward my views about them.(2)Elaborated the basic thought of geometric nonlinear theory based on finite element method, and treatment methods on geometric nonlinear of cable–stayed bridge is introduced: two-node catenaries cable element with arbitrary rigid; TL and UL formulation;geometric stiffness matrix of beam element.And solution procedure of geometric method is introduced.(3)Introduced the theory of shrinkage and creep, including Creep coefficient ; Shrinkage strain;Elastic modulus of concrete expression over time;the Relationship Equation of Shrinkage and creep strain and stress and the shrinkage and creep effects on the nonlinear.,With reference to JingYue Yangtze River Highway Bridge, analyze the geometrical nonlinear factors during construction of super long span cable-stayed bridge, especially shrinkage and creep effects on the nonlinear.