Lateral Force–Displacement Response of Unreinforced Masonry Walls with Flanges
Publication: Journal of Structural Engineering
Volume 140, Issue 4
Abstract
The experimental in-plane force-displacement response of unreinforced masonry (URM) walls with flanges (return walls) subjected to pseudo-static cyclic lateral loading is presented. Each wall failed in a diagonal tension mode followed by bed-joint sliding. The effect of wall flanges was an increase in the displacement capacity of the in-plane loaded wall, in comparison with an in-plane loaded wall without flanges. The measured shear strengths of the walls were compared with an analytical model for determining the limiting diagonal tension strength of the walls, with a high level of correlation. The initial stiffness of the shear walls before the effective yield was compared with the initial stiffness as determined using conventional principles of mechanics for homogeneous materials, and it was found that with some approximations the initial stiffness could be satisfactorily determined. Because the bed-joint sliding failure mechanism exhibited by the walls is a deformation-controlled action, there is further displacement capacity beyond the effective yield displacement, and it was found that the walls could sustain in-plane lateral forces to a drift of at least 0.7%. Recommendations are provided for a general force-displacement relationship, which is consistent with the experimental data and can be used for modeling URM walls and improving acceptance criteria, such as those specified in ASCE/SEI 41-06.
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References
Abrams, D. P. (1997). “Response of unreinforced masonry buildings.” J. Earthquake Eng., 1(1), 257–273.
ASCE/SEI. (2007). “Seismic rehabilitation of existing buildings.”, Reston, VA.
Atkinson, R. H., Amadei, B. P., Saeb, S., and Sture, S. (1989). “Response of masonry bed joints in direct shear.” J. Struct. Eng., 2276–2296.
Benedetti, D., and Tomaževič, M. (1984). “Sulla verifica sismica di costruzioni in muratura (on the seismic assessment of masonry structures).” Ingegneria Sismica, 1, 9–16 (in Italian).
Costley, A. C. (1996). “Dynamic response of unreinforced masonry buildings with flexible diaphragms.”, Univ. of Buffalo, Buffalo, NY, PB97–133573, MF–A03, A15.
Derakhshan, H., Dizhur, D., Lumantarna, R., Cuthbert, J., Griffith, M. C., and Ingham, J. M. (2010). “In-field simulated seismic testing of as-built and retrofitted unreinforced masonry partition walls of the William Weir House in Wellington.” J. Struct. Eng. Soc. N. Z., 23(1), 51–61.
Dizhur, D., Derakhshan, H., Ingham, J. M., and Griffith, M. C. (2009). “In-situ out-of-plane testing of unreinforced masonry partition walls.” 11th Canadian Masonry Symp., Canadian Concrete Masonry Producers Association, Toronto.
Dizhur, D., and Ingham, J. M. (2010). “Field testing of an earthquake-damaged unreinforced masonry building.” 7th Int. Conf. on Urban Earthquake Engineering (7CUEE) and 5th Int. Conf. on Earthquake Engineering (5ICEE), Tokyo Institute of Technology, Tokyo.
Dizhur, D., Ismail, N., Knox, C., Lumantarna, R., and Ingham, J. M. (2010). “Performance of unreinforced and retrofitted masonry buildings during the 2010 Darfield earthquake.” Bull. N. Z. Soc. Earthquake Eng., 43(4), 321–339.
Dizhur, D., et al. (2011). “Performance of masonry buildings and churches in the 22 February 2011 Christchurch earthquake.” Bull. N. Z. Soc. Earthquake Eng., 44(4), 279–296.
FEMA. (1997). “NEHRP guidelines for the seismic rehabilitation of buildings.”, Washington, DC.
FEMA. (2000). “Prestandard and commentary for the seismic rehabilitation of buildings.”, Washington, DC.
Gambarotta, L., and Lagomarsino, S. (1997a). “Damage models for the seismic response of brick masonry shear walls. Part I: The mortar joint model and its applications.” Earthquake Eng. Struct. Dyn., 26(4), 423–439.
Gambarotta, L., and Lagomarsino, S. (1997b). “Damage models for the seismic response of brick masonry shear walls. Part II: The continuum model and its applications.” Earthquake Eng. Struct. Dyn., 26(4), 441–462.
Gere, J. M., and Timoshenko, S. P. (1997). Mechanics of materials, PWS, Boston.
Ingham, J. M., Biggs, D. T., and Moon, L. M. (2011a). “How did unreinforced masonry buildings perform in the February 2011 Christchurch earthquake.” Struct. Eng., 89(6), 14–18.
Ingham, J. M., and Griffith, M. C. (2011b). “Performance of unreinforced masonry buildings during the 2010 Darfield (Christchurch, NZ) earthquake.” Aust. J. Struct. Eng., 11(3), 207–224.
Magenes, G., and Calvi, G. M. (1997). “In-plane seismic response of brick masonry walls.” Earthquake Eng. Struct. Dyn., 26(11), 1091–1112.
Moon, F. L. (2004). “Seismic strengthening of low-rise unreinforced masonry structures with flexible diaphragms.” Ph.D. thesis, Georgia Institute of Technology, Atlanta.
Moon, F. L., Yi, T., Leon, R. T., and Kahn, L. F. (2006). “Recommendations for seismic evaluation and retrofit of low-rise URM structures.” J. Struct. Eng., 663–672.
New Zealand Society for Earthquake Engineering (NZSEE). (2006). Assessment and improvement of the structural performance of buildings in earthquakes, Wellington, New Zealand.
Paquette, J., and Bruneau, M. (2003). “Pseudo-dynamic testing of unreinforced masonry building with flexible diaphragm.” J. Struct. Eng., 708–716.
Russell, A. P., and Ingham, J. M. (2010). “Prevalence of New Zealand’s unreinforced masonry buildings.” Bull. N. Z. Soc. Earthquake Eng., 43(3), 182–201.
Steelman, J., and Abrams, D. P. (2007). “Effect of axial stress and aspect ratio on lateral strength of URM shear walls.” 10th North American Masonry Conf., The Masonry Society, St. Louis, MO.
Tomaževič, M. (1996). “Recent advances in earthquake resistant design of masonry buildings.” 11th World Conf. on Earthquake Engineering, Pergamon, Oxford, U.K.
Yi, T. (2004). “Experimental investigation and numerical simulation of an unreinforced masonry structure with flexible diaphragms.” Ph.D. thesis, Georgia Institute of Technology, Atlanta.
Yi, T., Moon, F. L., Leon, R. T., and Kahn, L. F. (2006a). “Analyses of a two-story unreinforced masonry building.” J. Struct. Eng., 653–662.
Yi, T., Moon, F. L., Leon, R. T., and Kahn, L. F. (2006b). “Lateral load tests on a two-story unreinforced masonry building.” J. Struct. Eng., 643–652.
Yi, T., Moon, F. L., Leon, R. T., and Kahn, L. F. (2008). “Flange effects on the nonlinear behaviour of URM piers.” Masonry Soc. J., 26(2), 31–42.
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Information
Published In
Journal of Structural Engineering
Volume 140 • Issue 4 • April 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Apr 12, 2011
Accepted: May 3, 2013
Published online: May 6, 2013
Published in print: Apr 1, 2014
Discussion open until: Apr 28, 2014
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