A Comparative Study on T-beam Girder and Box Girder Bridges for Different Skew Angles

To cater the need of rapid urbanisation construction of bridges becomes the need of the time.It is often found that there is a need to change the layout of the bridge or to skew it by certain angle due to the presence of natural or man-made obstacles like river crosses, important structures, etc. Due to this it is often necessary to construct bridges with a certain skew angle.Skew angle can be defined as the angle subtended by the center line of the support and the global vertical direction.The response of the bridge structure depends on many factors like the cross-sectional parameters, span of the bridge, skew angle, type of live load, etc.In the current dissertation a study is carried out to understand the behavior of a two lane skew T-beam bridge and a skew box girder bridge for a fixed span of 20m and skew angles of 10°, 20°, 30°, 40°, 50° and 60°.The live load considered on the bridge are IRC Class AA Tracked and IRC Class A Train.Modeling and analysis of all the bridge models was performed in SAP2000 (Version 14) software after validating it with the values obtained by manual calculations.The analysis results for bending moment on girders/web, shear force on girder/web and bending moment on deck slab are obtained and compared with the results obtained for a normal bridge along with the comparison for different live loads.