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Working stress (allowable stress) is obtained as:
AYield (or ultimate) stress DIVIDED by factor of safety
BNo formula
CMultiplied yield by FS
DAdd safety to yield
Answer & Solution
Correct answer: A. Yield (or ultimate) stress DIVIDED by factor of safety
Working stress = yield/FS or UTS/FS. Factor of safety > 1 provides margin. Typical FS: steel against yield 1.5-1.67; concrete against compressive 3-4. Higher for brittle materials or critical structures.
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