Research Of Construction Control Of Long-span CFST Basket-handling Arch Bridge

Concrete-filled Steel Tubular basket-handling arch bridge have taken place with the application of concrete-filled steel tubular arch bridges in my country. It occupies a competitive position in field of modern bridges, because of its following advantages: light structure, beautiful model and large crossing ability.This paper makes a historical of review of the development of arch bridges through their early development, their condition of research and their trend of development. On the basis of ZhongMen Bridge of Sanmenkou sea-crossing in XiangSan County in ZheJiang Province, this paper study some contents as follows:(1) This paper detailedly expounds the main content, principles, methods and the influencing factors of construction control.(2) Space model of Concrete-filled Steel Tubular arch bridge was set up by finite element analysis software for bridge structure to analyze structure procedure the construction course. Based on the structure's analysis of the construction, the development of stress and displacement during construction was predicted to provide direction for actual construction.(3) This paper introduce a forward-iteration method for determining the cable tensing forces, which is based on the controlling state of the main rib been formed in one step. this paper implements an analysis on the ZhongMen Bridge by this method. And good results are obtained.(4) This paper studies the shrinking creep of concrete to some extent., which analyzed and contrasted the coefficient of creep of concrete filled steel tubes, develops the calculation formulas of equivalent elastic modulus on the basis of effective elastic modulus, adopts common structure analyses procedure MIDAS to calculate and analyze the redistribution of section stress in the concrete filled Steel tubes arch bridge, and draw some meaningful conclusions.(5) The unilateral rib-assembling of the half-through arch bridge was investigated. The effect of skew angle of cable on the internal force of the bare rid after slacking the cable are studied. Under the real heigth of the main tower, the reasonable layout of the cable for the optimum internal force of the arch in the completion state was presented.