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Comparison and Study of Different Aspect Ratio of Box Culvert

Author(s):

Ketan Kishor Sahu , Bhilai institute of technology durg chhattisgarh; Shraddha Sharma, Bhilai institute of technology durg chhattisgarh

Keywords:

box culvert, single and double cell, compressive strength

Abstract

A basic assumption in analysis of the box culvert is the displacement and forces are uniform in the longitudinal direction of the culvert. This assumption holds true for certain type of loadings than others. For example soil loading applied to the surface or pavement maybe considered as uniform in the longitudinal direction. Solution therefore is independent of one of the three orthogonal axes and can be formulated in remaining two axes. Thus problem can be treated as two dimensional. Analysis of box culvert is done by stiffness matrix method. The model with respect to support conditions has been considered. Box culvert is assumed as externally determinate assuming discrete boundary conditions. Single cell box structure is assumed as rigid frame structure consisting of top slab, bottom slab and two vertical side walls which forms a closed rigid box frame It is assumed that structure is externally determinate. Also the pressure distribution at the bottom is assumed linear and bottom chord members are continuously supported. Axial and shear deformations are neglected. Based on above assumptions analysis is carried out by staad pro software. It is well known that roads are generally constructed in embankments which come in the way of natural flow of storm water (from existing drainage channels).As, such flow cannot be obstructed and some kind of cross drainage works are required to be provided to allow water to pass across the embankment. The structures to accomplish such flow across the road are called culverts, small and major bridges depending on their span which in turn depends on the discharge. This Paper is devoted to box culverts constructed in reinforced concrete having one, two or three cells and varying their operating conditions and analysis for their design. The cost by considering optimum thicknesses and the cost without considering optimum thicknesses are compared. Accordingly results are presented which justifies that optimum thicknesses presented over here are leads to economical design of box culvert. An attempt is made to generate the charts of bending moments for top and bottom members. Such that from these charts at any intermediate aspect ratio the valves of bending moments can be evaluated. The average percentage reduction in the cost for single cell, double cell and triple cell is presented.

Other Details

Paper ID: IJSRDV3I70101
Published in: Volume : 3, Issue : 7
Publication Date: 01/10/2015
Page(s): 167-175

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