Investigation of Skew Curved Bridges in Combination with Skewed Abutments under Seismic Response

The present study investigates the seismic response of skew curved concrete box girder bridges under free vibrations and forced vibrations. A bridge having in plan curvature in combination with the skewed abutments is termed as skew curved bridge. 3 D models of the bridge with varying configurations are generated in the CSiBridge. The curvature angle for the parametric study has been varied as 0°, 30°, 60° and 90° in combination with skew angles of 0°, 15°, 30°, 45° and 60°. Modal analysis and response spectrum analysis for all the bridge models has been performed. Modal response of the various bridge configurations has been presented in graphical form in order to have knowledge of the mode shapes, time periods and fundamental frequencies of the bridges. Furthermore, mode participation factor for three orthogonal directions also have been determined for every configuration of the bridge considered. After performing response spectrum analysis, variation of out of plane bending moment, in plane bending moment, and longitudinal torsion along with the span length under horizontal i.e. longitudinal and transverse and vertical component of seismic excitations has been also presented using graphical representation. Results indicate that increase in skew angle leads to decrease the time period ratios in first vertical mode of vibration. Chandrashekhar Khulhare | P. K. Singhi "Investigation of Skew Curved Bridges in Combination with Skewed Abutments under Seismic Response" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-5 , August 2022, URL: https://www.ijtsrd.com/papers/ijtsrd50536.pdf Paper URL: https://www.ijtsrd.com/engineering/civil-engineering/50536/investigation-of-skew-curved-bridges-in-combination-with-skewed-abutments-under-seismic-response/chandrashekhar-khulhare