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How much percentage increase of permissible stress is allowed when dead load, live load and wind load are considered together in working stress method?(a) 50%(b) 33%(c) 40%(d) 60%This question was posed to me in homework.My doubt is from Design Considerations, Analysis & Methods topic in section Basics of Structural Design of Design of Steel Structures

Answer» RIGHT answer is (b) 33%

The EXPLANATION: In WORKING stress method, working stress ≤ permissible stress.

Stress due to dead LOAD + live load ≤ permissible stress

Stress due to dead load + WIND load ≤ permissible stress

Stress due to dead load + live load + wind load ≤ 1.33 permissible stress.


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