With the development of the enhanced materials and techniques for analysis of bridge, long span cable-supported bridges are introduced. Cable-supported bridges comprise both suspension and cable-stayed high strength bridge systems. Both these forms of cable-supported bridge are flexible structures in behavior. These flexible systems are susceptible to the dynamic effects of wind and earthquake loads. With the increasing span of the bridge, the flexibility of the bridge is escalating. In this paper, an attempt is made to enhance the rigidity of long span bridge . For enhancing the rigidity of the bridge in lateral and vertical directions, a different configuration of the cable-stays of long span cable-stayed bridge is considered. To understand the response of the long span cable-stayed bridge, the modal time history analysis is carried out in SAP2000 software. The parameter considered to analyze the cable-stayed bridge is dissimilar to cable-stays configuration. The behavioral response of the bridge is presented in the form of a time period in lateral and vertical direction for structural members of the bridge.

The demand for bridges is increasing day-by-day with the increasing population and their needs. To provide easy transportation in the metro city, the long span bridges requirements are increasing day-by-day. In the 20th century, development and research in the field of the bridge engineering took place largely to fulfill the need for the very long span bridges. With the development of new material and techniques for analysis, very long span cable-supported structures came into practice. In general, for very long span bridges, the high strength steel cables are used as structural load resisting elements (Krishna, 2001). In cable-stayed bridge configuration, the cables are directly connected from pylon to the deck. In the suspension bridge, the main cable is supported between two pylons, and the suspenders are connected vertically to the deck from the main cables (Podolny, 1986). The combination of the above two types of cable-supported bridge results in a very long span hybrid cable-stayed suspension bridge (Starossek, 1996).

A parametric study was carried out for static, dynamic and seismic loadings of the cable-stayed bridge and discussed in this paper. Also, the significant stayed cable configurations of the cables are incorporated with special inclination of stayed cable with the vertical axis passes through the connection of deck and cable stays.

Structural Engineering Journal, Cable-stayed bridge, Cable-stays configuration, SAP2000, Modal time history
analysis.