S. Brzev1, D.L. Anderson2, W. McEwen3, and G. Sturgeon4
1Faculty, Department of Civil Engineering, British Columbia Institute of Technology, 3700 Willingdon Avenue, Burnaby, BC V5G 3H2, Canada, sbrzev@bcit.ca
2Professor Emeritus, Department of Civil Engineering, Univ. of B.C., Vancouver, BC V6T 1Z4, dla@civil.ubc.ca
3Executive Director, Masonry Institute of British Columbia, 3636 E. 4th Ave, Vancouver, BC V5M 1M3, Canada, info@masonrybc.org
4Technical Services Engineer, Canadian Concrete Masonry Producers Association/National Concrete Masonry Association, Suite 345, Bay 14, 312 – 5th Ave. West, Cochrane, AB T4C 2E3, Canada, bbstek@telus.net
ABSTRACT
Changes in the seismic design provisions contained in Part 4 of the National Building Code of Canada 2005 (NBCC 2005) and the CSA S304.1-04 masonry design standard impact masonry design and construction in Canada. The Canadian Concrete Masonry Producers Association has responded by sponsoring the development of the Seismic Design Guide for Masonry Buildings. CSA S304.1-04 does not contain a commentary explaining the underlying theoretical background and rationale for the requirements in the standard. The Guide fills this need by explaining the seismic provisions of the standard and of the NBCC, and is intended to assist practicing structural engineers in the seismic design of concrete masonry elements for low- to medium-rise structures.
This paper presents highlights of the Guide, which includes a review of the general seismic design provisions contained in Part 4 of NBCC 2005, an overview of CSA S304.1-04 seismic design requirements for reinforced masonry walls, and a summary of the differences in the seismic design provisions contained in the 1995 and 2005 editions of NBCC and the 1994 and 2004 editions of CSA S304.1 including a case study of a typical warehouse building designed to both NBCC 1995 and NBCC 2005 for three Canadian locations characterized by different seismic hazard (Vancouver, Calgary, and Toronto).
The guide also provides twelve design examples that illustrate seismic load calculations and distribution of forces to building elements in accordance with NBCC 2005, and the design of masonry shear walls in accordance with CSA S304.1-04. Research needs and code issues emerging from the development of this guide are also presented.
KEYWORDS: concrete masonry, seismic design, reinforced masonry, shear walls, CSA S304.1-04
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