Cable Force Optimization And Construction Control Of Cable-stayed Bridge With Single Water-drop-shaped Pylon

The cable-stayed bridge is mainly consist of the beam,cable and tower. The cable-stayed bridge is widely used all over the world because of its structure characteristic. Based on the Anhui Guohe River Bridge which is building as an engineering background, several key problems of constrction monitoring are studied in this paper. Such as pre-camber setting method, cable force optimization and secondary cable adjustment control, shrinkage effects analysis of the interface between segmental concrete, temperature effects during the construction monitoring.In this paper, we firstly summarize the domestic and foreign development process of cable-stayed bridge, the structure form of cable-stayed bridge and the related research status.Then we introduce the engineering background and the main research contents of this paper.Based on the analysis of concrete gravity, temporary construction loads, prestress change, cable force change and other factors which effect the alignment of the Guohe River Bridge, we further analyze the pre-camber’s specific setting method and fitting the calculated pre-camber on completed bridge status.This paper introduces some cable force optimization methods and derives calculation formula which based on the calculation of the unstressed length catenary theory.To provide theoretical fundaments for bridge’s construction control, we optimize the final cable force of Guohe River Bridge, calculate non stress length of cable both before and after secondary cable adjustment.For various reasons, the continuity of concrete segmental pouring construction may be interrupted, the shrinkage of after pouring concrete will be constraint by pre segmental concrete. The differences of concrete age before and after the segmental may result in longitudinal cracks which is in the post-poured box girder’s roof and floor. Therefore, it’s necessary for shrinkage effects analysis of the interface between segmental concrete. Analysing before and after segmental concrete pouring time interval, ordinary steel reinforcement ratio and environmental humidity of before and after pouring concrete segment with the influence of shrinkage effects. The results can provide powerful technical support for construction quality.To determine the time of closure and provides theoretical basis for alignment adjustment. This paper analysis the bridge structure displacement and section stress when the cable-stayed bridge in the maximum cantilever phase and the closure stage by the overall warming, overall cooling and temperature gradient. In order to further ensure that the precision of closure of the Guohe River Bridge during cantilever construction, we present the temperature gradient error correction table,which may also applicable as references to the bridges of similar kind.