Earthquakes and Structures

  • 제2권2호
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  • Pages.109-126
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  • 2011
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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

An assessment of code designed, torsionally stiff, asymmetric steel buildings under strong earthquake excitations

  • Kyrkos, M.T. (Department of Civil Engineering, University of Patras) ;
  • Anagnostopoulos, S.A. (Department of Civil Engineering, University of Patras)
  • 투고 : 2010.06.07
  • 심사 : 2011.02.08
  • 발행 : 2011.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

The inelastic earthquake response of non-symmetric, braced steel buildings, designed according to the EC3 (steel structures) and EC8 (earthquake resistant design) codes, is investigated using 1, 3 and 5-story models, subjected to a set of 10, two-component, semi-artificial motions, generated to match the design spectrum. It is found that in these buildings, the so-called "flexible" edge frames exhibit higher ductility demands and interstory drifts than the "stiff" edge frames. We note that the same results were reported in an earlier study for reinforced concrete buildings and are the opposite of what was predicted in several other studies based on the over simplified, hence very popular, one-story, shear-beam type models. The substantial differences in such demands between the two sides suggest a need for reassessment of the pertinent code provisions. In a follow up paper, a design modification will be introduced that can lead to a more uniform distribution of ductility demands in the elements of all building edges. This investigation is another step towards more rational design of non-symmetric steel buildings.

키워드

참고문헌

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피인용 문헌

  1. Earthquake induced torsion in buildings: critical review and state of the art vol.8, pp.2, 2015, https://doi.org/10.12989/eas.2015.8.2.305
  2. Efficient Seismic Design of 3D Asymmetric and Setback RC Frame Buildings for Drift and Strain Limitation vol.143, pp.4, 2017, https://doi.org/10.1061/(ASCE)ST.1943-541X.0001689
  3. Influence of pinching effect of exterior joints on the seismic behavior of RC frames vol.6, pp.1, 2014, https://doi.org/10.12989/eas.2014.6.1.089
  4. Preliminary Structural Design of Wall-Frame Systems for Optimum Torsional Response vol.11, pp.1, 2017, https://doi.org/10.1007/s40069-016-0183-2
  5. Torsional effects in symmetrical steel buckling restrained braced frames: evaluation of seismic design provisions vol.8, pp.2, 2015, https://doi.org/10.12989/eas.2015.8.2.423
  6. Should accidental eccentricity be eliminated from Eurocode 8? vol.8, pp.2, 2015, https://doi.org/10.12989/eas.2015.8.2.463
  7. Ratio of Torsion (ROT): An index for assessing the global induced torsion in plan irregular buildings vol.9, pp.1, 2015, https://doi.org/10.12989/eas.2015.9.1.145
  8. Improved earthquake resistant design of eccentric steel buildings vol.47, 2013, https://doi.org/10.1016/j.soildyn.2012.07.011
  9. Extension of the hybrid force/displacement (HFD) seismic design method to 3D steel moment-resisting frame buildings vol.147, 2017, https://doi.org/10.1016/j.engstruct.2017.06.013
  10. Locating optimum torsion axis in asymmetric buildings subjected to seismic excitation vol.171, pp.9, 2018, https://doi.org/10.1680/jstbu.17.00068