Analysis And Construction Optimation For Large Span Stiff Skeleton Arch Bridges

With the construction of long-span arch bridge,the development of high-strength economic aggregate materials makes the construction technology of large-span skeleton arch bridge widely used in the construction of large-span skeleton arch bridge.In this paper,Nanpanjiang Bridge(main span 416 m of the skeleton arch bridge)as the research object.The contents of this paper include the following aspects:(1)By summarizing the two kinds of commonly used calculation of arch rib hoisting cable-stayed force method to consider construction process of structural stress,low accuracy,linear and linear expectation of arch rib large deviation problems,ausing the method of the bridge during construction of cable-stayed force and hoisting process of linear calculation.(2)Analyzes the influence of environment temperature on the linear effect of the construction of arch rib,and puts forward the formula for the modification of the influence of temperature on the installation of the section.(3)Based on the improved calculation method of cable force on the response surface model fitting regression response surface method,then the MATLAB of cable-stayed force is optimized,the optimized control points of arch rib forming deformation less than before optimization.(4)Research adopt single construction control in the process of outsourcing concrete pouring method(multipoint balanced load method)structure of adverse stress,by setting the suspension cable way(suspension hang buckle + more balanced load method)can effectively improve the skeleton structure and the stress in the process of outsourcing in the split ring pouring of concrete.(5)Outsourcing by coMParing analysis of concrete with different working face and the number of different segments in the process of construction of frame structure,the stress of the outsourcing of concrete and the effect on the stability of the structure,so as to get the optimal outsourcing concrete construction scheme.The research results of this paper have some reference significance for the construction of long span stiffness skeleton arch bridge.