Design Expression for the In-Plane Shear Strength of Reinforced Concrete Masonry
Publication: Journal of Structural Engineering
Volume 133, Issue 5
Abstract
Aspects relating to codification of the in-plane shear strength of concrete masonry walls when subjected to seismic loading are presented in this paper. Particular emphasis is placed on a model that is capable of representing the interaction between flexural ductility and masonry shear strength to account for the reduction in shear strength as ductility level increases. The simple method proposed here allows the strength enhancement provided by axial compression load to be separated from the masonry component of shear strength and is considered to result from strut action. In addition, minor modifications are made to facilitate adoption of the method in the updated version of the New Zealand masonry design standard, NZS 4230:2004. Prediction of shear strength from NZS 4230:2004 and alternative methods are compared with results from a wide range of masonry walls tests failing in shear. It was established that the shear equation in the former version of the New Zealand masonry standard (NZS 4230:1990) was overly conservative in its prediction of masonry shear strength. The current National Earthquake Hazards Reduction Program (NEHRP) shear expression was found to be commendable, but it does not address masonry shear strength within plastic hinge regions, therefore limiting its use when designing masonry structures in seismic regions. Finally, the new shear equation implemented in NZS 4230:2004 was found to provide significantly improved shear strength prediction with respect to its predecessor, with accuracy close to that resulted from NEHRP.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The writers wish to acknowledge the financial support provided by the New Zealand Earthquake Commission (EQC). Thanks also go to David Barnard, Mike Cathie, and Professor Guido Magenes of the University of Pavia for their assistance in developing the new masonry shear equation.
References
Anderson, D. L., and Priestley, M. J. N. (1992). “In plane shear strength of masonry walls.” Proc., 6th Canadian Masonry Symp., Saskatchewan, Sask., Canada, 223–234.
Applied Technology Council. (1981). “Seismic design guidelines for highway bridges.” ATC-6, Berkeley, Calif.
Fattal, S. G., and Todd, D. R. (1991). “Ultimate strength of masonry shear walls: Prediction vs test results.” NISTIR 4633, Building and Fire Research Laboratory, Gaithersburg, Md.
Matsumura, A. (1988). “Shear strength of reinforced masonry walls.” Proc., 9th World Conf. on Earthquake Engineering, Vol. 7, Tokyo, 121–126.
National Earthquake Hazards Reduction Program (NEHRP). (1997). Recommended provisions for seismic regulations for new buildings and other structures, Part-1 provisions, Building Seismic Safety Council, Washington, D.C.
Priestley, M. J. N. (1977). “Seismic resistance of reinforced concrete masonry shear walls with high steel percentages.” New Zealand Nat. Soc. Earthquake Eng. Bull, 10(1), 1–16.
Priestley, M. J. N., Verma, R., and Xiao, Y. (1994). “Seismic shear strength of reinforced concrete columns.” J. Struct. Eng., 120(8), 2310–2329.
Shing, P. B., Schuller, M., and Hoskere, V. S. (1990). “In-plane resistance of reinforced masonry shear walls.” J. Struct. Eng., 116(3), 619–640.
Standard Association of New Zealand (SANZ). (1990). “Code of practice for the design of masonry structures.” NZS 4230:1990, Wellington, New Zealand, Parts 1 and 2.
Standards Association of New Zealand (SANZ). (2004). “Design of reinforced concrete masonry structures.” NZS 4230:2004, Wellington, New Zealand.
Sveinsson, B. I., Mayes, R. L., and McNiven, H. D. (1985). “Cyclic loading of masonry single piers, Vol. 4—Additional test with height to width ratio of 1.” Rep. No. UCB/EERC-85/15, Earthquake Engineering Research Center, Berkeley, Calif.
Tomazevic, M., and Lutman, M. (1988). “Seismic resistance of reinforced masonry walls.” Proc., 9th World Conf. on Earthquake Engineering, Vol. 6, Tokyo, 97–102.
Voon, K. C., and Ingham, J. M. (2001). “Towards suitable shear strength provisions for inclusion in the New Zealand masonry design standard.” Proc., 6th Australian Masonry Conf., Adelaide, South Australia, 393–402.
Voon, K. C., and Ingham, J. M. (2006). “Experimental in-plane shear strength investigation of reinforced concrete masonry walls.” J. Struct. Eng., 132(3), 400–408.
Information & Authors
Information
Published In
Copyright
© 2007 ASCE.
History
Received: Feb 24, 2005
Accepted: Jun 1, 2006
Published online: May 1, 2007
Published in print: May 2007
Notes
Note. Associate Editor: Sanj Malushte
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.