ANALYSIS AND DESIGN OF STEEL TRUSS BRIDGE FOR MASS RAPID TRANSIT SYSTEM

Abstract

Trusses are used in bridges to transfer the gravity load of moving vehicles to supporting piers. Among the various types of bridges plate girder bridges, truss bridges and box girder bridges are more commonly used. Recently Indian Railways has either constructed several world class bridges or they are in the process of Construction. Howrah Bridge, also known as Rabindra Setu, is to be looked at as an early classical steel bridge in India. . Some of the trusses that are used in steel bridges Truss Girders, lattice girders or open web girders are efficient and economical structural systems, since the members experience essentially axial forces and hence the material is fully utilized. Members of the truss girder bridges can be classified as chord members and web members. Generally, the chord members resist overall bending moment in the form of direct tension and compression and web members carry the shear force in the form of direct tension or compression. Due to their efficiency, truss bridges are built over wide range of spans. Truss bridges compete against plate girders for shorter spans, against box girders for medium spans and cable-stayed bridges for long spans. In this research, a study has been carried out to find out the efficient and economical option best suited for obligatory situations in metro viaduct. In the first part of this report, background of the study and literature review of the previous study is presented. Initially two type of steel bridges are adopted in this study, first one is Pratt truss bridge and another one is Arch truss bridge. The present work is carried out considering metro viaduct in Delhi which is in zone 4 region. Members of truss bridge are designed manually. STAAD.Pro.V8i software is used throughout this study for the structural modeling and analysis of bridge. Weight of steel truss bridge is calculated and comparison is done on the basis of it.