Analysis And Design Of Curved U-Shaped Prestressed Precast Girder

Abstract

Since the early 2000s, the importance of infrastructure has grown in de- velopment economics. Infrastructure is now regarded as a prerequisite for sustained economic growth in developing countries. As cities become the en- gines of economic growth, large developing cities face major challenges due to the continuous growth of urban population, private vehicle ownership, con- gestion, and the fragility of public transportation system. Major and metro cities in India has experienced rapid physical and economic growth in recent decades, resulting in severe road traffic congestion. Therefore the need arise to develop high quality metro system as the backbone to the integrated mass transport system. In India generally the bridges are constructed with cast in situ construc- tion technique. Diferent types of the bridge superstructure are constructed in India such as Slab, T-shape, I-shape, Box shape, Arch type etc. Depend- ing upon the requirement of the bridge selection of superstructure has been done. In present scenario, aesthetic of the bridge structure is the important aspect in design of bridge. Generally, in India railway bridges are constructed with steel section. During the Delhi Metro project and Mumbai Metro project the concept of precast prestressed bridge superstructure with U-shaped has been imple- mented. The precast construction reduces time duration of project which result in saving in the cost. The precast girder has good aesthetic as com- pare to cast-in situ girder in construction management. Due to the U shape of girder it will obstruct view of machines part of rail which result in good view of rail. The prestressed precast U-shaped girder may be give new di- mension to bridge superstructure.The U-shaped girder has better scope as it can replace current trend of design of bridge with I,T or Box shaped girder. In present study, the analysis and design of Curved U-shaped prestressed girder for railway loading is done with specification of Concrete bridge rule under Indian Railway Standards.