The Studies On Dynamic Performance And Wind Resistant Security Of Suspension Bridge During The Constriction Process

In 20 centuries the early part of 80's, our country has started to get into Suspension Bridges construction's ages. The Suspension Bridge's biggest across path of record is break continuously very quickly. With increasing span length of suspension bridges, it certainly will cause some new problems. For example, the dynamic performance of each part of structure, and the problem of aerostatics stability for Suspension Bridges in wind load. Among them the aerostatics wind load is the key load to the Control design of Suspension Bridges. At the design stage, we are be requested that the wind load of the part of Suspension Bridges must be estimated exactly.After introducing the Suspension Bridges dynamic analysis method and the theories against the wind, in this paper, By taking the RunYang Bridge and the Xi HouMen Suspension Bridge as example, use MIDAS——the finite element procedure. According to the design request and construction characteristics of the XiHouMen Suspension Bridge, establish construction process of calculation model. Imitate construction process the spot prognosticate data. Make use of finite element method to carry on the analysis of structure motive function in the construction stage of Suspension Bridges. At the meantime, Has considered the main cable and the rope tower interaction. Discovers the key factors to achieve the goal to enhance the critical wind speed and reduces the oscillation amplitude. Considering the influence of wind load in the construction stage, carry on the aerostatics stability of suspension bridge's analysis and comparison, and main parameters that affect aerostatics stability of Suspension Bridges are pointed out. For example, with the initial angle of attack increases, the Suspension Bridges' aerostatics stability will drop.In the meantime, give some improvement and suggestion for the dynamic performance of Suspension Bridges. And Propose some measures to the design against the wind and construction of Suspension Bridges.