【正文】
epth of bridge pier foundation rock. In this case, just on the bridge structure can be extended with two beams out of a beam from each shore, and in the two ends of the beam anchorage basis. This simple structure is more rigid frame bridge with static characterization, and each root anchorage of the beam cantilever bridge called such an infrastructure, and perhaps this most simple and familiar example is the cantilever bridge diving board. Cantilever bridge in general, the gap between the cantilever tip is closed, the road to provide a continuous deck. But if the point of this bridge in its closed off, then do not need each other to set the root cantilever support which can maintain stability. Cantilever is usually only the middle of the gap is closed rigid frame bridge. So while filling grain extended cantilever span. Suspension bridge in the absence than in the case of the middle pier cantilever bridge across the greater distance. Suspension of the support system is a continuous flexible cables by the ends of the anchor, the suspension bridge is the simplest example of highaltitude highwire acrobat with the circus wire. The original suspension bridge is often a very small few that is tied to steel rails and provide a foothold. At the level of the modern suspension bridge on the road is suspended by the cable on both sides of the roadway below. Arch is the opposite effect on the suspension bridge, suspension bridge cables in the freedom of those who provide support force where it is from the bridge pillars at both ends of its fixed upward. As different in shape, suspension bridge cables tend to stretch all the points of the pillars of the bridge tends to squeeze everywhere. For these reasons, suspension of the cable must be as much as possible to prevent the exte