Bowstring Arch Bridge Crane Cable Force Optimization And Adjustment Of Research And Implementation

As a kind of bowstring arch bridge with beautiful appearance at the same time, suitable for city or soft soil foundation built on the bridge, the bridge at home and abroad on the architecture occupies a very important position, and its construction method and design theory are more mature and perfect. But with the rapid development of modern society, new materials, new construction methods emerge in endlessly, vehicle flow and load also unceasingly increases, these are for the further development of bowstring arch bridge, puts forward the new challenge. Bowstring arch bridge, the bridge as the dead load state of the internal force distribution and size is measured quality design one of the major criteria, reasonable into bridge state when the arch rib, girder in constant, under the influence of live load and bending stress small and uniform stress state. But in general case, due to the design, construction and structure their various limitations, requests each bridge meet such a stress state is not realistic. But no matter what kind of structure system, can always by adjusting the boom of the tension structure in the deterministic loads, some reaction force performance goals to achieve optimal, solving this group of optimal boom tension, is boom hanger forces optimization.About cable force optimization, many scholars both at home and abroad to do a lot of research work, and puts forward a variety of optimization method, the commonly used optimization method can fall into four categories:(1) the designated stress or displacement of the state of cable force optimization, such as rigid support continuous beam method and zero displacement method; (2) the unconstrained hanger forces optimization, such as bending moment and bending energy method of least squares of the minimum method; (3) the constrained optimization of cable force, if use cable quantity minimum method and the maximum deviation minimum method; (4) the optimization of the cable force influence matrix method. Almost all the above methods is to pull the optimization of the cable-stayed bridge cable force, and according to the bowstring arch bridge, the optimization of the boom of cable force of literature is rare. This paper will reference cable-stayed bridge cable force and the optimization of the influence matrix method, the use of Midas Civil optimization software, a constrained minimum energy method to study the bowstring arch bridge, the bridge as the state boom of cable force optimization.In this paper, a span of 80 m with the flexible tie bar reinforced concrete arch bridge as the engineering background, the peso strength before and after optimization in the construction phase and use phase into a bridge static stress, structural stability, structural natural vibration characteristic. The main conclusions of this paper and the results are as follows:1. The cable force optimization has a great influence on the static characteristics of the structure, the optimized cable force can satisfy the engineering design requirements.2. The cable force optimization little impact on the dynamic performance of the structure, do little to improve the stability of the structure. The structure of the whole stiffness depends mainly on the arch ribs and the rigidity of the tie bar, derrick arrangement, and the way the wind brace layout.