ANALYSIS OF CONCRETE BOX GIRDER BRIDGES USING CSI BRIDGE 2014

Abstract

Bridges are the life-line of nation. Now a days any project not only serves the purpose of need, strength and serviceability but aesthetics is a factor that has occupied the major share in finalizing any project’s demand. Thus curved, skewed, sleek, box girders are being constructed these days. Box girders not only look pleasant but also serve the purpose of strength. A parametric study is performed on concrete box girders having different skew angles. Further these box girders are analyzed as post tensioned box girder having different post tensioning forces and comparison is made in responses obtained using CSI Bridge 2014 software. For this purpose four different skewed alignments are considered 0⁰, 5⁰, 10⁰, 15⁰. Again two post tensioned forces 500Kips, 700 Kips are applied. The various responses like torsion, shear force, deflection, bending moment about vertical axis (M3), bending moment about horizontal axis (M2), modal frequencies, longitudinal stresses at soffit at entire girder are studied. Then a tension check is performed to check the stresses coming on soffit of girder before and after post tensioning. The conclusions drawn from the study are discussed further.