《Bridge engineering handbook桥梁工程手册-19斜拉桥》.pdf

19 Cable-Stayed Bridges 19.1 Introduction 19.2 Configuration General Layout • Cables • Girder • Tower 19.3 Design Permanent Load Condition • Live Load • Thermal Loads • Dynamic Loads 19.4 Superlong Spans 19.5 Multispan Cable-Stayed Bridges Man-Chung Tang 19.6 Aesthetic Lighting T.Y. Lin International 19.7 Summary 19.1 Introduction Since the completion of the Stromsund Bridge in Sweden in 1955, the cable-stayed bridge has evolved into the most popular bridge type for long-span bridges. The variety of forms and shapes of cable- stayed bridges intrigues even the most-demanding architects as well as common citizens. Engineers found them technically innovative and challenging. For spans up to about 1000 m, cable-stayed bridges are more economical. The concept of a cable-stayed bridge is simple. A bridge carries mainly vertical loads acting on the girder, Figure 19.1. The stay cables provide intermediate supports for the girder so that it can span a long distance. The basic structural form of a cable-stayed bridge is a series of overlapping triangles comprising the pylon, or the tower, the cables, and the girder. All these members are under predominantly axial forces, with the cables under tension and both the pylon and the girder under compression. Axially loaded members are generally more efficient than flexural members. This contri