DISPLACEMENT–BASED SEISMIC DESIGN OF SKEW RC BRIDGE PIERS | ||
| The International Conference on Civil and Architecture Engineering | ||
| Article 27, Volume 7, 7th International Conference on Civil and Architecture Engineering, May 2008, Pages 52-68 PDF (942.28 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/iccae.2008.45505 | ||
| Authors | ||
| AYMAN HUSSEIN HOSNY KHALIL1; SHEHAB MOURAD2; MOHAMED NOUR FAYED3; MOHAMED ABDEL AZIZ4 | ||
| 1Associate Professor, Department of Structural Engineering, Ain Shams University. | ||
| 2Associate Professor, College of Engineering , King Saud University, Saudi Arabia. | ||
| 3Professor, Department of Structural Engineering, Ain Shams University. | ||
| 4Structural Engineer, Dar Al-Handasah Consultants (Shair and Parteners), Giza, Egypt. | ||
| Abstract | ||
| Current bridge codes and standards apply ordinary bridge seismic design procedures to skew bridges neglecting the torsional and bilateral effects during the seismic excitations. As a result, there is a need to investigate the seismic behaviour of skew bridge piers. This paper highlights the important features of displacement based seismic design. Then, it provides the details and the results of a theoretical parametric study to assess the seismic performance of skew bridge’s piers. The theoretical study parameters are the skew angle, the pier height to thickness ratio, and the vertical reinforcement ratio. A commercial nonlinear finite element software package, Strand 7, was used in the analysis. A force controlled pushover analysis with triangular load pattern was applied to push pier models. The performance relationships of secant stiffness, length of the formed plastic hinge, and displacement ductility to pier geometry, and vertical reinforcement ratio were developed for skew bridge’s piers. Results show that displacement ductility for skewed piers is very sensitive to the variation of the skew angle at low skew angles especially for low vertical reinforcement ratio. Further, the displacement ductility is reduced as the amount of vertical reinforcement increased with the confining reinforcement ratio being constant. It was also shown that the effect of skew angle becomes less significant for small skew angles and for short piers. Finally, the secant stiffness changed significantly with skew angle variation for short piers. | ||
| Keywords | ||
| Skew bridge’s piers; displacement based seismic design; displacement ductility; secant stiffness; plastic Hinge | ||
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