Question

Calculate the design wind pressure if the basic wind speed is 44 m/s, risk coefficient is 1, topography factor is 1, terrain is with closely spaced buildings and height of building(class A) = 20m .

(a) 1285 N/m^2

(b) 1580 N/m^2

(c) 1085 N/m^2

(d) 1185 N/m^2

This question was addressed to me during an internship interview.

This key question is from Determination of Wind Loads & Load Combinations topic in division Structural Analysis, Loading and Load Combinations of Design of Steel Structures

Answer 1

Correct option is (d) 1185 N/m^2

For explanation: Vb = 44m/s, k1 = 1, k3 = 1,

for terrain with closely spaced buildings, height of building=20m, class A: k2=1.01 (from IS 875 Part 3)

 Vz = k1k2k3Vb = 1×1.01x1x44 = 44.44 m/s

pz = 0.6Vz2 = 0.6x(44.44)2 = 1184.95 N/m^2.