Cable stayed bridge is a bridge deck system, the support system of the bridge, the bridge deck system with stiffening beam, the supporting system is composed of steel wire.In 1956, the Stromsun bridge in Sweden began the apex of the modern cable-stayed bridge. With the development of material science and computer science, a lot of cable-stayed bridges have been built at home and abroad. The cable-stayed bridge has been developed rapidly because of its advantages such as large span, good structural performance, simple construction, easy maintenance, low cost and attractive appearance.
2 the girder structure system of the main girder structure system can be divided into four different systems according to the combination of the girder tower and the cable tower:Floating system: Tower Pier tower girder girder consolidation, separation, in addition to support at both ends, all the rest of the cable suspended, this system does not provide effective support for the transverse beam, to the temperature shrinkage and creep force structure, the cross section deformation and internal force changes smoothly, uniform stress, but must be in the cantilever construction in the tower at the temporary consolidation.Support system: Tower Pier tower girder girder consolidation, separation, set the vertical support in the tower, a three span continuous beam or cantilever beam with elastic support, the latter is in a cross hinge or a hanging hole, a hanging hole to a certain length, in order to avoid the side load, resulting in hanging hole excessive tilt.Tower beam consolidation system: the tower beam is fixed and supported on the pier, the stay cable is an elastic support, which can be used for continuous beam or cantilever beam.Rigid frame system: the beam pier is mutually consolidated to form a rigid structure with multi point elastic supports.3 overview of cable-stayed bridge construction process: the construction of cable-stayed bridge erection method in general there are three common methods: support method, push method and cantilever construction method. The first two methods used in the early construction of cable-stayed bridge, the cable-stayed bridge grew up in modern, especially from the tower to the cantilever construction on both sides of the multi span cable-stayed bridge with missile, inclined cable segment support.
And so on, which make it develop rapidly.The main feature of the cable-stayed bridge is to use the cable as the elastic intermediate support, which is used to improve Liang Kua.Improve the span of the beam. Of course, the elastic supporting effect of the inclined cable on the beam can only be fully realized when the cable is in a tight state. So it is necessary to pre pull the cable before the load. This pretension can also reduce the stress variation of inclined cables, cable stiffness increase, thereby improving the stress condition of the structure, in addition, axial horizontal component of inclined cables on the girder of the pressure can enhance the crack resistance of the girder, saving the amount of high strength steel. Cable stayed bridge is a composite structure composed of cable, tower and beam. In cable-stayed bridge. The beam and the tower are the main load-bearing components, and the whole structure is formed by the cable group. According to the way of supporting beam, including connection beam and tower or piers, composed of the parent structure of different forms, but all through the beam in the form of inclined cables hanging elastic support on the tower, the intermediate elastic support (inclined cables) to enhance the stiffness of the beam, forming a multi point elastic variable cross section support continuous beam, cantilever beam, single T rigid frame and continuous rigid frame. The 1 main girder according to different material combined into three types of steel, concrete and steel beam with concrete bridge deck. The steel beam is divided into two types: steel truss and solid beam. The section of the beam is shown as follows: the section of concrete beam is as follows:
