NUMERICAL EVALUATION OF THE DYNAMIC CHARACTERISTICS OF SUSPENSION BRIDGE WITH MR DAMPER

Suspension bridge is a bridge in which the deck slab of the bridge is hung below the suspension cables on vertical suspenders. Usually, the bridge is designed to connect the communities which are separated by a great distance by topographical barriers such as river, mountains, etc. In a suspended deck bridge, cables suspended via towers hold up the road deck and the weight are transferred by the cables to the towers, which in turn transfer the weight to the ground. Bridge failure, which is generally associated with serious economic and life losses, is defined as the incapacity of a constructed bridge or its components to perform as specified in the design and construction requirements. Principal causes can be divided into internal causes and external causes or natural factors and human factors. Design error, construction mistakes, hydraulic, collision, and overload are the top 5 leading causes of bridge failures, resulting in more than 70% of the bridge failures. Causes of bridge failures are closely related to regional economy, structural type, type of use, material type, and service age. Recently the suspension bridge in Morbi, Gujarat about 230m long connects Darbargarh palace and Lakhdhirji Engineering College separated by Machchu river is collapsed, causing death of at least 135 people and injuries to more than 180 others. This is due to overloading, loss of strength and the occurrence of resonance. In this paper, a suspension bridge is modelled and analyses using ANSYS. Static &Modal analysis of the structure have various configurations were done. MRF is a type of smart fluid in a carrier fluid, usually a type of oil and it can be used as a damper because its force transmission capacity can be controlled by an electro-magnet.