Abstract: Bridges are the permanent structures which carry vehicular load or other moving load to pass through an obstacle. During the process of construction, we encounter various geometrical constraints and operational constraints due to the existing site condition. It is therefore necessary to identify the constraints in order to provide an efficient planning and optimum design. Thus, the paper presents the analysis and design of a 3-lane highway bridge with constraints. A bridge to carry a three-lane highway across a series of existing rail tracks and sidings underneath and a highway viaduct which the new highway bridge has to pass beneath is to be analysed and designed. A minimum horizontal clearance of 4.5 m shall be provided between any rail and the face of any piers or abutments to the new bridge above ground level, to avoid the need to design these elements for accidental impact. The bridge is designed for the vehicular loads as per IRC-06 2016. The bridge is modelled for simply supported and continuous span with pre-stressed precast SY Girder and SY Edge girder and is compared to that of an I girder with other bridge components having regular dimensions designed as per the India standard codes for the forces acting on the bridge structure. The comparison of displacements, moments and load carrying capacity of the above modelled structures are presented and discussed. Thus from the analysis report obtained, the structural response like displacements, moments and forces for the continuous span SY girder is less compared to that of the I girder for the same cross sectional area. Therefore from this paper it is evident that for the bridges of span greater than 20 m up to 40 m, SY beam provides an economical section.
Keywords: SY girder, I girder, Simply Supported Span, Continuous Span.
Title: Analysis and Design of Three Lane Highway Bridge with Constraints
Author: Madhu M
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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