ANALYSIS OF THREE SPAN CONTINUOUS INTEGRAL BRIDGE

Abstract

The long span pre-stressed concrete box girder bridges constructed in India before 1990 were free end cantilever bridges constructed monolithic, integral with the substructure. Such bridges have a central hinge which leads large deflection at the centre of the bridge span. These bridges also suffer severe damages at the hinge locations over a period of time. The bridge is made the three span continuous supported on Poly Tetra Fluro Ethylene (PTFE) bearings and were constructed before 2010. To avoid this hinge at the centre and make bearing free, integral at interior support and having bearings at both ends have been proposed in this research effort. The bridge has been analysed in MIDAS software. To design the R.C.C. sections using ULS and SLS load factors, OASYS software has been used. It has been observed that stresses in entire superstructure and piers are within acceptable limit and found all correct in all respect with economy and ease of construction.