Seismic Behavior of Circular Reinforced Concrete Bridge Columns under Combined Loading Including Torsion

Reinforced concrete (RC) columns of skewed and curved bridges with unequal spans and column heights can be subjected to combined loading including axial, flexure, shear, and torsion loads during earthquakes. The combination of axial loads, shear force, and flexural and torsional moments can result in complex failure modes of RC bridge columns. This study carried out experimental and analytical studies to investigate the seismic performance of circular RC columns under combined loading including torsion. The main variables considered here were (i) the ratio of torsion-to-bending moment (T/M), (ii) the ratio of bending moment-to-shear (M/V) or shear span (H/D), and (iii) the level of detailing for high and moderate seismicity (high or low spiral ratio). In particular, the effects of the spiral reinforcement ratio and shear span on strength and ductility of circular RC columns under combined loading were addressed. In addition, the effects of torsional loading on the bending moment-curvature, ductility, and energy dissipation characteristics were also considered. The analytical investigation examined the development of existing models for flexure and pure torsion. Interaction diagrams between bending, shear and torsional loads were established from a semi-empirical approach. A damage-based design approach for circular RC columns under combined loads was proposed by decoupling damage index models for flexure and torsion. Experimental and analytical results showed that the progression of damage was amplified by an increase in torsional moment. An increase in the transverse spiral reinforcement ratio delayed the progression of damage and changed the torsional-dominated behavior to flexural-dominated behavior under combined flexural and torsional moments.

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  • Supplemental Notes:
    • This research was sponsored by the U.S. Department of Transportation, University Transportation Centers Program. This dissertation was in partial fulfillment of the requirements for the Degree of Doctor of Philosophy.
  • Corporate Authors:

    Missouri University of Science and Technology, Rolla

    Center for Infrastructure Engineering Studies
    Rolla, MO  United States  65409

    Research and Innovative Technology Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Shanmugam, Suriya Prakash
  • Publication Date: 2009-12

Language

  • English

Media Info

  • Media Type: Web
  • Edition: Final Report
  • Features: Appendices; Bibliography; Figures; Photos; Tables;
  • Pagination: 338p

Subject/Index Terms

Filing Info

  • Accession Number: 01153172
  • Record Type: Publication
  • Report/Paper Numbers: UTC R165, Report No. 00016751
  • Contract Numbers: DTRS98-G-0021
  • Files: UTC, TRIS, USDOT
  • Created Date: Mar 23 2010 1:45PM