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Masonry Wall Height-to-Thickness Ratio

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A masonry wall has a specified effective height heff = 2.8 m (already accounting for its end conditions) and an actual thickness t = 200 mm. What is the ratio heff/t?
  1. A0.014
  2. B7.0
  3. C14.0
  4. D140
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Answer: C. 14.0

Convert to the same unit: 2.8 m = 2,800 mm. heff/t = 2,800/200 = 14.0. 0.014 divides 2.8 (m) by 200 (mm) without converting. 140 converts 2.8 m to 28,000 mm. 7.0 substitutes an assumed unsupported height of half the effective height (1.4 m) instead of using the supplied effective height. The ratio alone does not establish stability capacity.
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