TIME HISTORY ANALYSIS OF BALANCED CANTILEVER BRIDGE

Abstract

Infrastructures are nowadays a huge requirement in metro cities like Hyderabad, Chennai, Delhi, Mumbai and Bangalore etc. The days are evident that the traffic volume intensity has been increased like anything in the recent times. Hyderabad city is a real-time instance of traffic volume which leads to construct the flyovers in the various parts if the city. Generally the flyovers are either simply supported or rigid in nature (Example: PVNR Express Hyderabad, Punjagutta Flyover Hyderabad). These flyovers are known as segmental bridge; they have been meant for small spans and extended for huge length. The areas like traffic intersection this segmental bridge is not adequate where the lengths are prolong in the particular instances a large span bridge or flyover has to be selected where the traffic intersection should not be disturbed. The best suitable bridge for this particular case is balanced cantilever (two overhangs with mid span). To study the behavior of balanced cantilever bridge for a span of 100 m. a bridge is considered and a FEM mathematical model has been generated in CSI Bridge V15. The bridge is assumed to be subjected to real time earthquake in the form of Time History acceleration (Elcentro). The particular bridge is having 100 m total span in which each over hang is of 25 m and mid-span is of 50 m and width of the bridge is about 15.5 m. The parametric profile of the bridge is parabolic. The bridge is having 2 lane and 4 lane o traffic flow and it is subjected to IRC Class AA vehicular load HSN- 44 ASHTO Vehicular load. The bridge is having intermediate supports of bent and bent cap made up off bent beams and bent columns (3 columns).