Rational Cable Force Optimization Method Research Of Railway Cable-stayed Bridge

At present, in order to solve the problem of urban transportation, urban rail transit as a new form of urban traffic continues to be used, its representative is the city subway, light rail and urban fast railway. Rail transit in China started relatively late, with the development of rail transit, cable-stayed bridge is gradually applied to rail transit, in 2006, China first seat rail transit oblique stayed bridge in Changchun marks the completion China rail transit of the cable-stayed bridge; 2014 opening Caijiaying Jialing River rail bridge is the first span of dedicated railway cable-stayed bridge; recently under construction with Chongqing rail link Gao jia garden Jialing River Railway Special cable-stayed bridge.Now people to track traffic on the cable-stayed bridge research is relatively small, in order to meet the needs of the train running smoothly, rail traffic on the bridge alignment requirements is relatively high, and oblique stayed bridge is a flexible system, with the increase of the span, the deflection of the bridge will increase, cable-stayed bridge cable force can be adjusted, through the adjustment of cable force, cable- stayed bridge linear control. Therefore, cable-stayed bridge cable force optimization is Chinese and foreign scholars have been studied. This paper takes Chongqing City Garden Gao rail cable-stayed bridge as the engineering background to study the optimization of cable force of cable-stayed bridge.The main work of this paper is:①Firstly, this paper collected has been built and is building a cable-stayed bridge, introduces the current development situation of domestic and foreign cable-stayed bridge, according to the structure and characteristics of cable-stayed bridge, structural analysis on the basic theory of cable-stayed bridge, static analysis, dynamic analysis and calculation for stability analysis and nonlinear analysis and structure;②followed by the introduction of the cable stayed bridge reasonable a principle to determine the state of the bridge, cable force optimization basic concept, determine the reasonable finished bridge state commonly used method(force balance method, from the point of view of energy method, comprehensive optimization method), the advantages and disadvantages of the analysis and comparison of various methods and applicability.③The people of the cable-stayed bridge cable force optimization problem is not a good solution, the method mainly relied on the experience of repeated trial, finally find a set of reasonable cable force, the process is complex, large amount of calculation, and the efficiency is very low, this paper is on the basis of previous experience, to linear control as the target of optimization of cable force, taking into account the different position, response of girder alignment on cable force change, put forward different weights of control points, manual intervention by the weighted method, the optimization result is the different weighted coefficients are different, so the main contents of the study is to identify a set of reasonable weight to achieve rapid adjustment coefficient, the purpose of cable. In this paper, through the project, I identified three different weight coefficients through three methods, and compared with the calculation, and determined a reasonable weight coefficient.