Finite element analysis of skew box-girder bridges under IRC-A loading

Abstract

A study on simply supported single-cell skew reinforced concrete box-girder bridge is presented herein. The analysis is carried out using a finite element based software SAP 2000 v.14.0.0. An existing model is considered first to validate the present results with the reported one. A convergence study is then performed for the model, considered for investigation, to decide the mesh size for ensuring reliable results. Total 64 models, subjected to dead load and IRC class-A wheel load, are considered for investigation. An exhaustive parametric study is carried out in which the maximum bending moment, maximum shear force, maximum torsional moment, and reactions in girders are calculated. Further, stresses and vertical deflection of bridges are calculated. The results are presented in the form of force ratios between the skew bridge and the straight bridge. The skew angle effect, up to 30°, is almost negligible on forces and deflections, and thus such bridges can be analyzed as a straight one. The influence of other factors like span, span to depth ratio, and girder spacing are also considered for investigation. The results obtained in the syudy may be useful to the design of skew box-girder bridges.