Structural Dynamic Analysis On Kazi Gulf Bridge

Nowadays theories on bridge develop soon. With the development of inclined pull truss T structure, inclined pull consecutive beam and inclined pull consecutive truss, a new structure system has come into being in our country, which is the inclined pull truss initial concrete structure system. The bridge of Kazi gulf is the structure pattern for inclined pull consecutive truss, which combines some small poles gather to become a big structure system, and replaces inclined pull steel wire by initial concrete rigid pull pole. Abroad in the beginning of 80's in last century, this structure pattern had been studied and developed, and believed that it was a potential structure very much to develop big span initial concrete bridge. This paper applies a software ANSYS to calculate the bridge of Kazi gulf in three-dimensional entity model, compute the left bridge under the initial and the gravity before gather together, carry on left bridge and the whole bridge'mode analyses, finally analyze the left bridge under artificial seismic waves. Under the earthquake-respond analyze, the imported wave often use some adjusted waves of EI wave, Taft wave and local Tianjin etc, but these earthquake waves are not good to fit three main factors of earthquake locally estimated together. Here uses the triangle series method to make artificial seismic wave, this kind of earthquake wave considers those factors of the place condition, the travel path, the earthquake source distance, the earthquake class etc. This paper describes,in detail, the displacement, acceleration and shear stress responses of the left bridge under the lengthways and horizontal artificial seismic one acting separately. By analyzed the calculative results thoroughly, some meaningful conclusions have been obtained. At last, the paper also points out the existent problem and further research directions.