DOI QR코드

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Response of lap splice of reinforcing bars confined by FRP wrapping: application to nonlinear analysis of RC column

  • Pimanmas, Amorn (Sirindhorn International Institute of Technology, Thammasat University) ;
  • Thai, Dam Xuan (Civil Engineering Department, The National University of Civil Engineering)
  • 투고 : 2009.09.28
  • 심사 : 2010.09.13
  • 발행 : 2011.01.10

초록

This paper presents a nonlinear analysis of reinforced concrete column with lap splice confined by FRP wrapping in the critical hinging zone. The steel stress-slip model derived from the tri-uniform bond stress model presented in the companion paper is included in the nonlinear frame analysis to simulate the response of reinforced concrete columns subjected to cyclic displacement reversals. The nonlinear modeling is based on a fiber discretization of an RC column section. Each fiber is modeled as either nonlinear concrete or steel spring, whose load-deformation characteristics are calculated from the section of fiber and material properties. The steel spring that models the reinforcing bars consists of three sub-springs, i.e., steel bar sub-spring, lap splice spring, and anchorage bond-slip spring connected in series from top to bottom. By combining the steel stress versus slip of the lap splice, the stress-deformation of steel bar and the steel stress-slip of bars anchored into the footing, the nonlinear steel spring model is derived. The analytical responses are found to be close to experimental ones. The analysis without lap splice springs included may result in an erroneous overestimation in the strength and ductility of columns.

키워드

피인용 문헌

  1. Behaviour of fiber reinforced concrete beams with spliced tension steel reinforcement vol.43, pp.5, 2012, https://doi.org/10.12989/sem.2012.43.5.623
  2. Influence of FRP wrapping on reinforcement performances at lap splice regions in RC columns vol.116, 2017, https://doi.org/10.1016/j.compositesb.2016.10.069
  3. Strain penetration of high-strength steel bars anchored in reinforced concrete beam-column connections vol.72, pp.3, 2019, https://doi.org/10.12989/sem.2019.72.3.367