Structural Engineering and Mechanics

  • 제55권2호
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  • Pages.379-398
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  • 2015
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Redistribution of moments in reinforced high-strength concrete beams with and without confinement

  • Lou, Tiejiong (CEMUC, Department of Civil Engineering, University of Coimbra) ;
  • Lopes, Sergio M.R. (CEMUC, Department of Civil Engineering, University of Coimbra) ;
  • Lopes, Adelino V. (Department of Civil Engineering, University of Coimbra)
  • 투고 : 2015.03.01
  • 심사 : 2015.06.16
  • 발행 : 2015.07.25
⟨ 이전 논문 다음 논문 ⟩

초록

Confinement is known to have important influence on ductility of high-strength concrete (HSC) members and it may therefore be anticipated that this parameter would also affect notably the moment redistribution in these members. The correctness of this "common-sense knowledge" is examined in the present study. A numerical test is performed on two-span continuous reinforced HSC beams with and without confinement using an experimentally validated nonlinear model. The results show that the effect of confinement on moment redistribution is totally different from that on flexural ductility. The moment redistribution at ultimate limit state is found to be almost independent of the confinement, provided that both the negative and positive plastic hinges have formed at failure. The numerical findings are consistent with tests performed on prototype HSC beams. Several design codes are evaluated. It is demonstrated that the code equations by Eurocode 2 (EC2), British Standards Institution (BSI) and Canadian Standards Association (CSA) can well reflect the effect of confinement on moment redistribution in reinforced HSC beams but the American Concrete Institute (ACI) code cannot.

키워드

참고문헌

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피인용 문헌

  1. Effect of relative stiffness on moment redistribution in reinforced high-strength concrete beams vol.69, pp.14, 2017, https://doi.org/10.1680/jmacr.15.00499
  2. Moment redistribution in two-span prestressed NSC and HSC beams vol.50, pp.6, 2017, https://doi.org/10.1617/s11527-017-1116-5
  3. Flexural behavior of UHPC-RC composite beam vol.22, pp.2, 2016, https://doi.org/10.12989/scs.2016.22.2.387
  4. A comprehensive FE model for slender HSC columns under biaxial eccentric loads vol.73, pp.1, 2015, https://doi.org/10.12989/sem.2020.73.1.017