Structural Engineering and Mechanics

  • 제34권3호
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  • Pages.335-350
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  • 2010
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Out of plane behavior of walls, using rigid block concepts

  • Gh.M, Mohammadi (International Institute of Earthquake Engineering and Seismology (IIEES)) ;
  • F, Yasrebi (International Institute of Earthquake Engineering and Seismology (IIEES))
  • 투고 : 2008.02.12
  • 심사 : 2009.11.09
  • 발행 : 2010.02.20
⟨ 이전 논문 다음 논문 ⟩

초록

Out of plane behaviors of walls and infills are investigated in this paper, using rigid block concepts. Walls and infills are sometimes separated from top beams because of in plane movement of the walls and crumbling mortar layers under the top beams. Therefore, sufficient strength should be supplied to hold them against out of plane forces. Such walls are studied here under some real and scaled earthquakes, regarding their out of plane behavior. Influences of some reinforcements, connecting the walls to frames or perpendicular walls, are also studied. It is shown that unreinforced walls of regular sizes (3 m high and 4.5 m long) are normally unstable in the earthquakes. However, performing some reinforced bars that connect them to adjacent elements- frames or perpendicular walls - stabilizes them. Eventually, it is concluded that supplying 3 reinforced bars at 1/4, 2/4 and 3/4 of the panel's height stabilizes the walls in the assumed earthquakes. In this regard, for 20 cm and 35 cm thick walls ${\Phi}$18mm and ${\Phi}$20mm bars are to be used, respectively. For walls with other configurations, the forces and required areas of the reinforcements can be determined by the developed method of this paper.

키워드

참고문헌

  1. Angle, R. and Abrams, D.P. (1994), "Out of plane strength of URM infill panels", NCEER-94-0004, 1-14.
  2. Dafnis, A., Kolsch, H. and Reimerdes, H.G. (2002), "Arching in masonry walls subjected to earthquake motions", J. Struct. Eng-ASCE, 128(2), 153-159. https://doi.org/10.1061/(ASCE)0733-9445(2002)128:2(153)
  3. De Felice, G. and Giannini, R. (2001), "Out of plane seismic resistance of masonry walls", J. Earthq. Eng., 5(2), 253-271.
  4. El-Dakhakhni, W.W., Hamid, A.A., Hakam, Z.H.R. and Elgaaly, M. (2006), "Hazard mitigation and strengthening of unreinforced masonry walls using composites", Compos. Struct., 73(4), 458-477. https://doi.org/10.1016/j.compstruct.2005.02.017
  5. Fardis, M.N., Bousias, S.N., Franchioni, G. and Panagiotakos, T.B. (1999), "Seismic response and design of RC structures with plan-eccentric masonry infills", Earthq. Eng. Struct. D., 28, 173-191. https://doi.org/10.1002/(SICI)1096-9845(199902)28:2<173::AID-EQE810>3.0.CO;2-1
  6. FEMA 356 (2000), "Pre-standard for the seismic rehabilitation of buildings", Federal Emergency Management Agency, Second Draft.
  7. FEMA-273 (1997), "NEHRP Guidelines for the seismic rehabilitation of buildings, by the applied technology council (ATC-33 project)", Redwood city, CA, USA.
  8. Flanagan, R.D., Tenbus, M.A. and Bennett, R.M. (1994), "Numerical modelling of clay tile infills", NCEER-94-0004, 1-68.
  9. Housner, G.W. (1963), "The behavior of inverted pendulum structures during earthquakes", B. Seismol. Soc. Am., 53, 404-417.
  10. Jeong, M.Y. and Suzuki, K. (1997), "A study on the dynamic behavior of rocking rigid body using nonlinear rocking model", Proceedings of the ASME Pressure Vessels and Piping Conferences, Orlando, July.
  11. Makris, N. and Roussos, Y.S. (2000), "Rocking response of rigid blocks under near - Source ground motions", Geotechnique, 50(3), 559-578. https://doi.org/10.1680/geot.2000.50.5.559
  12. MATLAB-Matrix Laboratory (2006), Language of Technical Computing, Release R 2006 b, The MathWorks, Inc.
  13. Mendola, L.L., Papia, M. and Zingone, G. (1995), "Stability of masonry walls subjected to seismic transverse forces", J. Struct. Eng-ASCE, 121(11).
  14. Moon, F.C. (2004), Chaotic Vibrations, an Introduction for Applied Scientists and Engineers, Wiley.
  15. Pena, F., Prieto, F., Lourenceo, P.B., Campos Costa, A. and Lemos, J.V. (2007), "On the dynamics of rocking motion of single rigid-block structures", Earthq. Eng. Struct. D., 36(15), 2383-2399. https://doi.org/10.1002/eqe.739
  16. Yim, C.S., Chopra, A.K. and Penzien, J. (1980), "Rocking response of rigid blocks to earthquakes", Earthq. Eng. Struct. D., 8(6), 565-587. https://doi.org/10.1002/eqe.4290080606
  17. Zang, J. and Makris, N. (2001), "Rokings response of free – standing blocks under cycloidal pulses", J. Eng. Mech-ASCE, 127(5).