The Characteristics of Curvature Ductility Factor of Reinforced Concrete Hollow Section Beams

철근콘크리트 속빈 단면 보의 곡률연성지수 특성

  • Lee, Hyung-Joon (Dept. of Civil and Environmental Engineering, Hanbat National University)
  • 이형준 (한밭대학교 건설환경공학과)
  • Received : 2013.10.25
  • Accepted : 2013.12.05
  • Published : 2013.12.31


In highly elevated piers and long span beams, a hollow section is often used to reduce the self-weight and increase the flexural rigidity of members. Numerical analysis was conducted to obtain the moment-curvature curves and curvature ductility factor for the RC hollow section beams under a range of hollow portion sizes and reinforcement conditions in the upper flange and web. The curvature ductility factor was constantly maintained until the hollow portion size($b_i/b_o/h_i/h_o$) was less than or equal to 0.5. The curvature ductility factor decreased sharply if ($b_i/b_o/h_i/h_o$) was 0.7 or more. The curvature ductility factor of the beam decreased if reinforcement was provided in the web of the RC hollow section beam. To obtain the same level of the ductility factor as the singly reinforced section, the reinforcement should be provided in the upper flange as much as the web reinforcement.


Ductility factor;Numerical analysis;RC hollow section beam;Reinforcement condition


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