Structural Engineering and Mechanics

  • 제67권3호
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  • Pages.255-265
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  • 2018
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Prestress force effect on fundamental frequency and deflection shape of PCI beams

  • Bonopera, Marco (Bridge Engineering Division, National Center for Research on Earthquake Engineering) ;
  • Chang, Kuo-Chun (Department of Civil Engineering, National Taiwan University) ;
  • Chen, Chun-Chung (Bridge Engineering Division, National Center for Research on Earthquake Engineering) ;
  • Sung, Yu-Chi (Bridge Engineering Division, National Center for Research on Earthquake Engineering) ;
  • Tullini, Nerio (Department of Engineering, University of Ferrara)
  • 투고 : 2018.02.27
  • 심사 : 2018.05.17
  • 발행 : 2018.08.10
⟨ 이전 논문 다음 논문 ⟩

초록

The prestress force effect on the fundamental frequency and deflection shape of Prestressed Concrete I (PCI) beams was studied in this paper. Currently, due to the conflicts among existing theories, the analytical solution for properly considering the structural behavior of these prestressed members is not clear. A series of experiments were conducted on a large-scale PCI beam of high strength concrete with an eccentric straight unbonded tendon. Specifically, the simply supported PCI beam was subjected to free vibration and three-point bending tests with different prestress forces. Subsequently, the experimental data were compared with analytical results based on the Euler-Bernoulli beam theory. It was proved that the fundamental frequency of PCI beams is unaffected by the increasing applied prestress force, if the variation of the initial elastic modulus of concrete with time is considered. Vice versa, the relationship between the deflection shape and prestress force is well described by the magnification factor formula of the compression-softening theory assuming the secant elastic modulus.

키워드

과제정보

연구 과제 주관 기관 : National Applied Research Laboratories

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피인용 문헌

  1. Influence of prestressing on the behavior of uncracked concrete beams with a parabolic bonded tendon vol.77, pp.1, 2018, https://doi.org/10.12989/sem.2021.77.1.001
  2. Unified calculation model for the longitudinal fundamental frequency of continuous rigid frame bridge vol.77, pp.3, 2021, https://doi.org/10.12989/sem.2021.77.3.343