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NIST Research Program on the Seismic Resistance of Partially-Grouted Masonry Shear Walls.


pdf icon NIST Research Program on the Seismic Resistance of Partially-Grouted Masonry Shear Walls. (5493 K)
Schultz, A. E.

NISTIR 5481; 110 p. June 1994.

Available from:

National Technical Information Service
Order number: PB94-219052

Keywords:

masonry; shear walls; bond beam; building technology; cyclic load tests; finite elements; horizontal reinforcement; partial grouting; seismic loading; shear strength

Abstract:

A review of the current status of research on masonry structures at the Building and Fire Research Laboratory of the National Institute of Standards and Technology (NIST) is presented, and an ongoing project on partially-grouted masonry shear walls is summarized. This report draws from previous work conducted at NIST, including a comprehensive literature review (Yancey et al., 1991), simulated seismic load tests of unreinforced masonry walls (Woodward and Rankin, 1983; 1984a; 1984b; 1985a; 1985b) and reinforced masonry walls (Yancey and Scribner, 1989), and numerical analyses employing empirical formulations (Fattal and Todd, 1991; Fattal, 1993a, Fattal, 1993c) and finite element models (Yancey). The previous NIST research culminates with a preliminary draft outlining a research program on partially-grouted masonry shear walls (Fattal, 1993b). This program calls for simulated seismic load experiments of partially-grouted masonry walls, and numerical analyses, both empirical and finite element modeling of shear wall behavior. The existing preliminary draft of the research plan on partially-grouted masonry shear walls is revised in response to recent findings on the cyclic load response of masonry shear walls and to better reflect laboratory requirements for simulated seismic load tests at the NIST tri-directional testing facility (TTF). Specimen configuration, test setup, instrumentation, testing procedure, and numerical modeling are presented, along with a discussion of the shear strength of the specimens calculated using expressions available in the technical literature. The issue of minimum horizontal reinforcement in masonry shear walls is addressed in an appendix, and expressions are derived to serve as a guideline for the experimental program. Potential directions for future research are discussed in a second appendix.