Pivotal Technically Researching Of Continuous Beam Bridge In Plane Rotated Constructional Controlling

For the present stage, the swiveling study of continuous beam bridge mostly concentrate on static characteristics,and the dynamic Study of swing course relatively small. Studying on the Stability of swivel process mostly used standardized method to calculate and the current situation of finite element simulation, to research the key technologies of swiveling bridge.Relying on the swivel bridge project in Nanjing, in this paper, we mainly use the method of theoretical calculation and finite element simulation to analysis the force of ball joint and the swiveling stability of whole bridge. Specific work and major achievements include the following aspects:1. Setting up the stress calculation method of parallel rotation ball joint. Based on the contact stress of elastic mechanics solving boundary between spheres, considering the process of ball joint parallel rotation and work together by traction and friction, we can calculate principal stress of ball joint suffered under complex stress state, and derive normal stress intensity conditions according to the theory of the yield strength. Then by finite element analysis software ANSYS to build the model of ball joint, and simulate actual stress state. And combining the calculation methods of ball joint at rest state to competently analyze the precise calculation method based on strength theory, Through specific engineering case shows, we may make the concision that the deviate calculation of strength theory is about 7.5%, which is high accurate.2. Using the way of theoretical analysis to study the stability control measures of swiveling. Before swiveled, we may set wheel brace, temperate consolidation and slide way to prevent the process of swiveling. By the way of unbalance counterweight, control measurement and the way of monitoring the stress key parts to control the swivel stability.Relying on practical projects and checking the wind stability of lateral and portrait. We can find continual beam bridge structure does not be instable and have high anti-overturning safety factor in the swing.3. The FEM of swing stable factors. The mainly swing factors are the main pier height,swing speed acceleration and so on. By numerical simulate method, setting support project the FEM swing bridge, with seven kinds of pier height, we can make the conclusion of swing stability be decreased with the pier height. By simulating different speed and accelerate conditions, we can make the conclusion of stress with the square of speed be proportional, and approximately linear change with acceleration. Swiveling speed and acceleration have great imprecation on stability, and we have to strictly control swing speed and acceleration.