Also because of this, the cable will never “buckle” and highly efficient use of high strength steel materials becomes possible. However, the suspension cable can only sustain the tensile forces, which is different from the compressive forces in the arch. The curve shape of the suspension cables is similar to that of arch. This has led to the installation of dehumidification systems in many of the new and existing bridges. As the existing inventory of suspension bridges have aged, inspections have revealed active corrosion and stress corrosion cracking in many of the wires comprising the main cables. The resulting bridge is very elegant in appearance, and its form clearly expresses its function. The bridge can be erected without any ground-based towers. Suspension bridges are used for spans of 300– 2300 m. The purpose of the stiffening element is to ensure aerodynamic stability and to limit the local angel changes in the deck. The deck can be stiffened by a truss or by girder elements. The main cables can consist of parallel strong wires that are aerially spun in place or prefabricated wire ropes. The deck is suspended by strong ropes running from the deck level to the main cables. These cables act as tension elements and extend from anchors at each of their ends over the tops of the intermediate towers. Suspension bridges ( Figure 18.4) typically consist of two (and sometimes four) parallel cables separated by a distance approximately equal to the roadway deck width that they support. The structural components, classification, analytical method, and construction method of suspension bridges are discussed in this chapter.
In addition, the esthetic appearance of suspension bridges is another advantage in comparison with other types of bridges. Therefore, the deadweight of the bridge structure can be greatly reduced and longer span becomes possible. The whole cross-section of the main cable is highly efficient in carrying the loads and buckling is not problem. The main load carrying member is the main cables, which are tension members made of high-strength steel. Like other cable supported bridges, the superstructure of suspension bridges is constructed without false work as the cable erection method is used. The main cables are suspended between towers and are finally connected to the anchorage or the bridge itself, and vertical suspenders carry the weight of the deck and the traffic load on it.
The basic structural components of a suspension bridge system include stiffening girders/trusses, the main suspension cables, main towers, and the anchorages for the cables at each end of the bridge. Weiwei Lin, Teruhiko Yoda, in Bridge Engineering, 2017 AbstractĪ suspension bridge is a type of bridge in which the deck is hung below suspension cables on vertical suspenders.
0 kommentar(er)
