Earthquakes and Structures

  • 제8권2호
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  • Pages.423-442
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  • 2015
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  • 2092-7614(pISSN)
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  • 2092-7622(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Torsional effects in symmetrical steel buckling restrained braced frames: evaluation of seismic design provisions

  • Roy, Jonathan (Department of Civil, Geological and Mining Engineering, Ecole Polytechnique, University of Montreal) ;
  • Tremblay, Robert (Department of Civil, Geological and Mining Engineering, Ecole Polytechnique, University of Montreal) ;
  • Leger, Pierre (Department of Civil, Geological and Mining Engineering, Ecole Polytechnique, University of Montreal)
  • 투고 : 2014.05.08
  • 심사 : 2014.11.03
  • 발행 : 2015.02.25
⟨ 이전 논문 다음 논문 ⟩

초록

The effects of accidental eccentricity on the seismic response of four-storey steel buildings laterally stabilized by buckling restrained braced frames are studied. The structures have a square, symmetrical footprint, without inherent eccentricity between the center of lateral resistance (CR) and the center of mass (CM). The position of the bracing bents in the buildings was varied to obtain three different levels of torsional sensitivity: low, intermediate and high. The structures were designed in accordance with the seismic design provisions of the 2010 National Building Code of Canada (NBCC). Three different analysis methods were used to account for accidental eccentricity in design: (1) Equivalent Static Procedure with static in-plane torsional moments assuming a mass eccentricity of 10% of the building dimension (ESP); (2) Response Spectrum Analysis with static torsional moments based on 10% of the building dimension (RSA-10); and (3) Response Spectrum Analysis with the CM being displaced by 5% of the building dimension (RSA-5). Time history analyses were performed under a set of eleven two-component historical records. The analyses showed that the ESP and RSA-10 methods can give appropriate results for all three levels of torsional sensitivity. When using the RSA-5 method, adequate performance was also achieved for the low and intermediate torsional sensitivity cases, but the method led to excessive displacements (5-10% storey drifts), near collapse state, for the highly torsionally sensitive structures. These results support the current provisions of NBCC 2010.

키워드

과제정보

연구 과제 주관 기관 : Natural Sciences and Engineering Research Council (NSERC)

참고문헌

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피인용 문헌

  1. Seismic evaluation of cemented material dams -A case study of Tobetsu Dam in Japan vol.10, pp.3, 2016, https://doi.org/10.12989/eas.2016.10.3.717
  2. On the seismic response of steel buckling-restrained braced structures including soil-structure interaction vol.12, pp.4, 2015, https://doi.org/10.12989/eas.2017.12.4.469
  3. Numerical study on the effects of seismic torsional component on multistory buildings vol.13, pp.1, 2015, https://doi.org/10.12989/eas.2017.13.1.009
  4. Torsional sensitivity criteria in seismic codes vol.21, pp.1, 2015, https://doi.org/10.12989/eas.2021.21.1.001