Discussion
True or false: a structure designed for wind loads is automatically safe against earthquake loads in a high zone.
Answer: C
Correct answer: False, because the two demands differ in magnitude, direction and required ductility
Wind is a sustained external pressure on the exposed face, proportional to area, and it acts in one direction at a time. Earthquake force is inertial, proportional to mass, reverses rapidly through many cycles, and acts in whichever direction the ground moves.
The consequences differ accordingly. A wind design need not be ductile, because the load does not cycle into the inelastic range; an earthquake design must be, because it is expected to. Detailing, not merely force, is what the earthquake case adds.
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