Mechanical Investigation Of The Main Structure Of Double-Tower Cable Stayed Bridge

Computer aid engineering is a rapid developing information technique. It is an important tool for the numerical analysis of engineering structures and industrial products, and provides an effective manner for engineers to make design of new productions. Usually, it can be yielded to perform static, dynamical and transient response analyses for designed devices, predict the capabilities in use in virtual environment and make optimized design.The Sutong Bridge is located at Nantong section of Yangtse River. It is the nearest sea bridge on Yangtse River. Sutong Bridge includes north shore connection expressway, cross river bridge and south shore connection expressway. Sutong Bridge has four top scale aspects in the world. It has the longest single span, the deepest foundation, the highest tower and the longest cable. Sutong Bridge will be a milestone in the history of bridge building. In order to build such large scale double–tower cable stayed bridge, that it is more than one thousand meters long, without any destroy risks. Key technical investigation must be implemented to ensure the problems be resolved before the bridge being constructed. Under this background, a finite element technique in the CAE technique area is used to make numerical analyses for main structure, especially in static and vibrational analyses. The results will play important role to predict the capability of the bridge.The main structure of The Sutong Bridge will be double-tower cable stayed structure. It is a structure of complex spatial statically indeterminate structure. It will be suitable to been analyzed by spatial structural mechanics. The present paper will use the three-dimensional finite element method to calculate static force and vibrational modes of this main structure which has spatial distributed rods, plates and beams.In the present paper, the first, the internal static force of the upper structure is calculated by the finite element method with the spatial rod elements, spatial beam elements and spatial plate elements, in which the cable is modeled by the spatial rod elements, the cable towers is modeled by the spatial beam elements and the main bridge beam is modeled by the spatial plate elements. After the internal force calculations of the cable towers and main bridge beam, the streamline shape steel box beams are modeled the three-dimensional structure and the stresses and deformations are calculated. The second, the present paper investigates the vibrational behaviors of Sutong Bridge. The basic frequency and vibration modes are studied, including symmetric side bending modes, longitudinal moving modes, the first symmetric vertical bending mode, the first antisymmetric vertical bending mode and tower and beam side coupling bending modes. The study is able to provide reliable evaluations for bridge design to bear earthquake and wind forces.The detailed investigations of the present paper including the following terms: 1. The structural and mechanical models of static internal force analysis of the upper main structure...