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Governing Net Wind Pressure on a Wall

Mediumwindpressure coefficients
A wall net pressure is p = q(GCp − GCpi), with inward pressure positive. Take q = 800 Pa, external coefficient GCp = +0.80 (inward), and internal coefficient GCpi = either +0.18 or −0.18. Evaluate both signs. What is the greatest inward net wall pressure?
  1. A784 Pa
  2. B496 Pa
  3. C640 Pa
  4. D144 Pa
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Answer: A. 784 Pa

Equation: p = q(GCp − GCpi). With GCpi = +0.18: p = 800(0.80 − 0.18) = 496 Pa. With GCpi = −0.18: p = 800(0.80 + 0.18) = 784 Pa inward, which governs. Wrong: 496 Pa picks the less adverse internal sign; 640 Pa ignores internal pressure (800·0.80); 144 Pa is only the internal-suction term (800·0.18), not the net.
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