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

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

  1. Anagnostopoulos, S.A., Alexopoulou, C. and Stathopoulos, K. (2010), "An answer to an important controversy and the need for caution when using simple models to predict inelastic earthquake response of buildings with torsion", Earthq. Eng. Struct. Dyn., 39(5), 521-540.
  2. Carr, A.J., (2005), RUAUMOKO manual: theory and user-guide to associated programs, Vol.1, Univ. of Canterbury, New Zealand.
  3. Chandler, A.M and Duan, X.N. (1991), "Evaluation of factors influencing the inelastic seismic performance of torsionally asymmetric buildings", Earthq. Eng. Struct. Dyn., 20(1), 87-95. https://doi.org/10.1002/eqe.4290200107
  4. Chopra, A.K. and Goel, R. (1991), "Evaluation of torsional provisions in seismic codes", J. Struct. Eng. - ASCE, 117(12), 3762-3782. https://doi.org/10.1061/(ASCE)0733-9445(1991)117:12(3762)
  5. Duan, X.N. and Chandler, A.M. (1993), "Inelastic seismic response of code-designed multistory frame buildings with regular asymmetry", Earthq. Eng. Struct. Dyn., 22(5), 431-455. https://doi.org/10.1002/eqe.4290220506
  6. EC3 - Eurocode 3, (2004), "Design provisions for steel structures", Eur. Prestandard, CEN 1994; Doc.CEN/TC250/SC8/N (Latest Edition: Eurocode 8: Design of structures for earthquake resistance, European Standard EN1998-1:2004)
  7. EC8 - Eurocode 8, (2004), "Design provisions for earthquake resistance of structures", Eur. Prestandard, CEN 1994; Doc.CEN/TC250/SC8/N (Latest Edition: Eurocode 8: Design of structures for earthquake resistance, European Standard EN1998-1:2004).
  8. EAK2000 (2000), "Greek code for earthquake resistant design", Greek Ministry of Environment, City Planning and Public Works 2000.
  9. Humar, J.L. and Kumar, P. (1999), "Effect of orthogonal in plane structural elements on inelastic torsional response", Earthq. Eng. Struct. Dyn., 28(10), 1071-1097. https://doi.org/10.1002/(SICI)1096-9845(199910)28:10<1071::AID-EQE855>3.0.CO;2-V
  10. Karabalis, D.L., Cokkinides, G.J., Rizos, D.C., Mulliken, J.S. and Chen, R. (1994), "An interactive computer code for generation of artificial earthquake records", Computing in Civil Engineering (ASEE) 1994, K. Khozeimeh (ed.) 1122-1155.
  11. Kyrkos, M. and Anagnostopoulos, A. (2010), "Towards earthquake resistant design of steel buildings for uniform ductility demands", Invited paper, Proc., SEMC 2010: The Fourth International Conference on Structural Engineering, Mechanics and Computation : 135-140, Cape Town, South Africa, A. Zingoni (ed.), CRC Press Balkema 2010.
  12. Rutenberg, A. (2002), "Behavior of irregular and complex structures - Progress since 1998", EAEE Task Group (TG)8, Proc 12th European Conference on Earthquake Engineering, London, Elsevier No.832.
  13. Stathopoulos, K.G. (2001), "Investigation of the inelastic response and earthquake resistant design of asymmetric buildings", Ph.D. Dissertation, University of Patras, Greece. (in Greek)
  14. Stathopoulos, K.G. and Anagnostopoulos, S.A. (2002), "Inelastic earthquake induced torsion in buildings: results from realistic models", Proceedings, 12th European Conference on Earthquake Engineering, Paper no.453, London, UK.
  15. Stathopoulos, K.G. and Anagnostopoulos, S.A. (2005) "Inelastic torsion of multistory buildings under earthquake excitations", Earthq. Eng. Struct. Dyn., 34(12), 1449-1465. https://doi.org/10.1002/eqe.486
  16. Tso, W.K. and Zhu, T.J. (1992), "Design of torsionally unbalanced structural systems based on code provisions I: Ductility demand", Earthq. Eng. Struct. Dyn., 21(7), 609-627. https://doi.org/10.1002/eqe.4290210704

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