Effect of cable stiffness on the responses of a cable stayed bridge

Bridges are crucial in providing efficient transportation, infrastructure, and their design significantly influences structural performance, durability and over all safety. This study focuses on the comparative analysis of cable stay-bridge with different cable stiffness. The aim is to evaluate and distinguish their structural characteristics to improve bridge design and construction. Finite element analysis and simulation tools (MIDAS CIVIL) are employed to perform the Parametric analysis of cable stiffness of cable-stayed Bridge under different IRC loading conditions providing insights into their performance metrics such as bending moments, cable forces, deflection and Tower base moment. Cable stiffness is considered in two ways: the first is cable area and the second one is modulus of Elasticity of the cable. Economic contributions are crucial in infrastructure projects and this study evaluates the most economic section of cable stiffness. A three span fan type cable stayed-bridge of length 420m is considered. The Cable area is reduced by 5 to 20 percent, and also Modulus of Elasticity of cable are altered as per cable type.

The finding indicates that increase in cable area has more impact than increase in cable’s modulus of Elasticity. This study contributes towards Structural and working field engineers.