Structural Engineering and Mechanics

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Distribution of strength and stiffness in asymmetric wall type system buildings considering foundation flexibility

  • Atefatdoost, Gh.R. (Department of Civil Engineering, Estahban Branch, Islamic Azad University) ;
  • Shakib, H. (Tarbiat Modares University) ;
  • JavidSharifi, B. (Fars Regional Electrical Company (FREC))
  • Received : 2016.10.08
  • Accepted : 2017.02.24
  • Published : 2017.08.10
⟨ Previous Next ⟩

Abstract

Architecture constraints in buildings may typically cause irregularities in the distribution of stiffness and mass and consequently causes non-compliance of centers of mass, stiffness and strength. Such buildings are known as asymmetric buildings the distribution of strength and stiffness is one of whose main challenges. This distribution is more complicated for concrete buildings with RC shear walls in which stiffness and strength are interdependent parameters. The flexibility under the foundation is another subject that can affect this distribution due to the variation of dynamic properties of the structure and its constituting elements. In this paper, it is attempted to achieve an appropriate distribution pattern by expressing the effects of foundation flexibility on the seismic demand of concrete shear walls and also evaluate the effects of this issue on strength and stiffness distribution among lateral force resistant elements. In order to understand the importance of flexibility in strength and stiffness distribution for an asymmetric building in different conditions of under-foundation flexibility, the assigned value to each of the walls is numerically calculated and eventually a procedure for strength and stiffness distribution dependencies on flexibility is provided.

Keywords

References

  1. ASCE-2010, "Minimum Design Loads for Buildings and Other Structures", ASCE/SEI7-10, American Society of Civil Engineers, Reston, Virginia.
  2. Aziminejad, A. and Moghadam, A.S. (2009), "Performance of asymmetric multi story shear buildings with different strength distributions", J. Appl. Sci., 9(6), 1082-1089. https://doi.org/10.3923/jas.2009.1082.1089
  3. Badry, P. and Satyam, N. (2016), "Seismic soil structure interaction analysis for asymmetrical buildings supported on piled raft for the 2015 Nepal earthquake", J. Asian Earth Sci., 133, 102-113.
  4. Bhattacharya, K., Dutta, S.C. and Dasgupta, S. (2004), "Effect of soil-flexibility on dynamic behaviour of building frames on raft foundation", J. Sound Vib., 274(6), 111-135. https://doi.org/10.1016/S0022-460X(03)00652-7
  5. Chopra, A.K. (1995), Dynamics of Structures: Theory and Applications to Earthquake Engineering, Prentice-Hall, Englewood Cliffs, NJ.
  6. De-la-Colina, J., Valdes-Gonzalez, J. and Gonzalez-Perez, C.A. (2013), "Experiments to study the effect of foundation rotation on the seismic building torsional, response of a reinforced concrete space frame", Eng. Struct., 56, 1154-1163. https://doi.org/10.1016/j.engstruct.2013.06.005
  7. Mysilmaj, B. and Tso, W.K. (2004), "Desirable strength distribution for asymmetric structure with strength-stiffness dependent element", J. Earthq. Eng., 8(2), 231-248. https://doi.org/10.1080/13632460409350488
  8. Myslimaj, B. and Tso, W.K. (2001), "A strength distribution criterion for minimizing torsional response of asymmetric walltype systems", Earthq. Eng. Struct. Dyn., 29, 182-192.
  9. Myslimaj, B. and Tso, W.K. (2002), "A strength distribution criterion for minimizing torsional response of asymmetric walltype systems", Earthq. Eng. Struct. Dyn., 31, 99-120. https://doi.org/10.1002/eqe.100
  10. NEHRP Consultants Joint Venture (2012), "Soil-Structure Interaction for Building Structures".
  11. Paulay, T. (1986), "The design of ductile reinforced concrete structural walls for earthquake resistance", Earthq. Spectra, EERI, 2(4), 783-823. https://doi.org/10.1193/1.1585411
  12. Paulay, T. (1997), "Seismic torsional effects on ductile structural wall systems", J. Earthq. Eng., 1(4), 721-745. https://doi.org/10.1080/13632469708962385
  13. Paulay, T. (2002), "A displacement-focused seismic design of mixed building systems", Earthq. Spectra, 18(4), 689-718. https://doi.org/10.1193/1.1517066
  14. Paulay, T. (2002), "An estimation of displacement limits for ductile systems", Earthq. Eng. Struct. Dyn., 31(3), 583-99. https://doi.org/10.1002/eqe.157
  15. Paulay, T. (2003), "Seismic displacement capacity of ductile reinforced concrete building systems", Bull. Soc. Earthq. Eng., 36(1), 147-164.
  16. Paulay, T. and Priestley, M.J.N. (1992), Seismic Design of Reinforced Concrete and Masonry Buildings, John Wiley & Sons.
  17. Pauley, T. (2001), "Some design principles relevant to torsional phenomena in ductile buildings", J. Earthq. Eng., 5, 104-120.
  18. Priestley, N. and Kowalsky, M.J. (2007), "Displacement based seismic design of structures", IUSS.
  19. Roy, R. and Dutta, S.C. (2010), "Inelastic seismic demand of lowrise buildings with soil-flexibility", Int. J. Nonlin. Mech., 45(4), 419-432. https://doi.org/10.1016/j.ijnonlinmec.2009.12.014
  20. Shakib, H. (2004), "Evaluation of dynamic eccentricity by considering soil-structure interaction: a proposal for seismic design codes", Soil Dyn. Earthq. Eng., 24(5), 369-378. https://doi.org/10.1016/j.soildyn.2004.01.003
  21. Shakib, H. and Atefatdoost, G.R. (2011), "Effect of soil-structure interaction on torsional response of asymmetric wall type systems", The Proceedings of the Twelfth East Asia-Pacific Conference on Structural Engineering and Construction-EASEC12, Procedia Eng., 14, 1729-1736.
  22. Shakib, H. and Fuladgar, A. (2003), "Effect of vertical component of earthquake on the response of pure-friction base-isolated asymmetric buildings", Eng. Struct., 25(14), 1841-1850. https://doi.org/10.1016/j.engstruct.2003.08.008
  23. Shakib, H. and Fuladgar, A. (2004), "Dynamic soil-structure interaction effects on the seismic response of asymmetric buildings", Soil Dyn. Earthq. Eng., 24(5), 379-388. https://doi.org/10.1016/j.soildyn.2004.01.002
  24. Shakib, H. and Ghasemi, A. (2007), "Considering different criteria for minimizing torsional response of asymmetric structures under near-fault and far-fault excitations", Int. J. Civil Eng., 5(4), 247-265.
  25. Sikaroudi, H. and Chandler, A.M. (1992), "Structure-foundation interaction in the earthquake response of torsionally asymmetric buildings", Soil Dyn. Earthq. Eng., 11(1), 1-16. https://doi.org/10.1016/0267-7261(92)90022-6
  26. Sivakumaran, K.S. and Balendra, T. (1994), "Seismic analysis of asymmetric multistorey buildings including foundation interaction and P-${\Delta}$ effects", Eng. Struct., 16(8), 609-624. https://doi.org/10.1016/0141-0296(94)90047-7
  27. Tso, W.K. and Myslimaj, B. (2003), "A yield displacement distribution-based approach for strength assignment to lateral force-resisting elements having strength dependent stiffness", Earthq. Eng. Struct. Dyn., 32, 2319-351. https://doi.org/10.1002/eqe.328
  28. UBC (1997), "Uniform Building Code", International Conference of Building Officials, Whittier, California, USA.
  29. Wolf, J.P. (1985), Dynamic Soil-structure Interaction, Prentice-Hall. Inc., Englewood Cliffs, N. J.