Structural Engineering and Mechanics

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Experimental study on seismic performance of coupling beams not designed for ductility

  • Lam, S.S.E. (Department of Civil and Structural Engineering, The Hong Kong Polytechnic University) ;
  • Wu, B. (Department of Civil Engineering, South China University of Technology) ;
  • Liu, Z.Q. (School of Civil Engineering, Harbin Institute of Technology) ;
  • Wong, Y.L. (Department of Civil and Structural Engineering, The Hong Kong Polytechnic University)
  • Received : 2006.04.10
  • Accepted : 2007.11.27
  • Published : 2008.02.20
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Abstract

Seismic performance of coupling beams not designed for ductility is examined. Eight 1:4 scale coupling beam specimens, with seven reinforced concrete sections and one composite section, were tested under cycles of push-pull action. Characteristics of the specimens include moderate shear span ratio in the range of 2.5-3.5, high main reinforcement ratio at 3-4% and small to large stirrup spacing with 90- degree hooks. All the reinforced concrete specimens failed in a brittle manner. Displacement ductility of specimens with large stirrup spacing (${\geq}$140 mm) is in the range of 3 to 5. Seismic performance of the specimens is also examined using the ultimate drift angle and the amount of energy dissipated. Correlating the test data, an empirical relationship is proposed to estimate the ultimate drift angle of a class of coupling beams considered in the study not designed for ductility.

Keywords

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