Cable Force Optimization Study Of Concrete Arch Bridge With The Casting Catilever Method

Cantilever construction arch bridge was constructed by the juncture pier, and the temporary tower was used in constructing. When one steel wire was fixed on the segment of main arch ring, the other steel wire was fixed on anchor block, so a cable-stayed structure was formed, then the forward basket was moved to next arch ring to continue construct until the arch ring was closed. When constructing, they were bearing system including cable, tower and arch ring. In the system temporary cables was an elastic intermediate supports, the moment of section was decreased by them.Some works should be done mainly in the following aspects in the paper:1、Based on a careful study of Chinese related literature, the construction method of bridge several commonly used and construction process are expounded, and the advantages and disadvantages of the various methods of construction are analyzed and summarized.2、Using Midas/Civil and ANSYS finite element software to build cable-stayed cantilever arch bridge finite element model, the conduct construction stage analysis, after finished bridge of the research Force characteristics.3、Based on the influence matrix method, Midas/Civil unknown load coefficient function was utilized to optimize the cable force of the fastening stay in the construction stage. The objective function was the sum of squares of the bending moment of the arch rib section under dead load and live load in the finished stage, and the adjustable vector was the cable force of the8pairs of fastening stays in the longest cantilevered state before the closure of the arch bridge. After the optimization of the cable force, the arch bending moment of Xinmi Bridge in the finished stage under dead load and live load at the same time was significantly reduced。4、Based on first-order optimization, ADPL parameterized modeling was used to the optimization study of the cable force of the fastening stay of the cantilever casted arch bridge. The optimization process was divided into two steps. The first step was to optimize the cable force in the cantilever pouring stage aiming to the tensile stress level of the arch ring in the cantilever pouring stage. And the second is to optimize the cable force step in the finished bridge state aiming to the sum of squares of the bending moment。5、Based on first-order optimization, considered the live load effect in the operation stage, an optimization study on the cable force of the fastening stay of the cantilever casted arch bridge was conducted, thus to make the structure to be qualified for the reasonable operation stage. As compressive stress is the main mechanical characteristic of an arch bridge, the bending moment level and the eccentricity of the key section of the bridge in the operation stage were used as the target optimization functions to study how to improve the reasonable cable force of the mechanical performance of the arch ring in the operation stage。...