ANALYSIS OF BOX TYPE MULTI-BARREL SKEW CULVERT

As the numbers of bridges comes up it has become healthy to provide box type multi-barrel skew culvert where traffic moves on the top of continuous slab and water flows through barrels underneath it. Present situation of traffic requirements demand straight alignment of road in view of the fast traffic and this in turn necessities the use of skew crossings. By providing this type of alternatives, bridge span is in direction of road, we can directly provide skew culvert. So, there is no need for provide approaches on both side in form of curve which will solve land acquisition problem and project becomes faster and economical. Modelling and analysis of the skew bridge deck and box is to be done in STADD PRO and/or in SAP. For single cell analysis separate worked out manually with considering all load combination guided in IRC-6. The problem consisting of two lane road width (7.5m) and span of 20m. Each barrel is dimension has 5m by 5m. For dead load, live load, earth pressure, water pressures are considering and for various load combination it will be analysed and for critical design will be made. For analysis, Culvert is designed for 0degree skewness for single, two, three and, four barrels. Further comparative study is carried out for different skew angles 10degree, 20degree, 30degree, 40degree, 50degree and, 60degree.Parametric study also done for the given problem statement by considering various skew angles for comparing bending moments. Another study done for different support condition on base slab.