The design involves calculation of the section properties, primary and secondary moments, magnitude and location of the prestressing force, profile of the tendons, losses due to prestressing, shear stresses at different sections. Before starts design dimensions are assumed based on experience. Construction commences from the permanent piers and proceeds in a ' balanced ' manner to mid span. This method has great advantages over other forms of construction in urban areas where temporary shoring would disrupt traffic and services below, in deep gorges, and over waterways where false-work would not only be expensive but also a hazard. It is one of the most efficient methods of building bridges without the need of false work. INTRODUCTION Balanced Cantilever Bridge is so named due to its method of construction. Keywords- Balanced cantilever bridge, Prestressed, I girder, Box girder, Primary and secondary moments and MIDAS Civil I. The design of super structure is performed as per IRC standards.

The bridge structure has been modelled by Finite element Technique using MIDAS Civil and analysis has been performed to get various output such as primary and secondary bending moment, shear forces and torsion quantities at various locations of the bridge. This chapter include the analysis and design of a 50m span prestressed balanced cantilever bridge which comprises of 6 numbers of PreCast Post Tensioned-I Girder 38m long Simply Supported at one end and connected through a Cast-in-Situ Stitch Concrete to a Continuous Balanced Cantilever Box Girder (2x11m). Hence for the medium span in the range of about 35 to 60 m, a combination of supported span, cantilever and suspended span can be adopted and bridge with this type of superstructure is known as balanced cantilever bridge. But unyielding supports are required for continuous construction.

If continuous spans are used, the governing bending moment can minimised and hence the individual span length can increase. Balanced cantilever bridges are used for special requirements like 1) Construction over traffic 2) Short lead time compared to steel 3) Use local labour and materials.

Midas civil tendons