1.

The design compressive stress, fcd of column is given by(a) [fy / γm0]/ [φ – (φ^2-λ^2)^2].(b) [fy / γm0] / [φ + (φ^2-λ^2)].(c) [fy / γm0]/[φ – (φ^2-λ^2)^0.5].(d) [fy / γm0] / [φ + (φ^2-λ^2)^0.5].This question was addressed to me by my school principal while I was bunking the class.This intriguing question comes from Design of Compression Members topic in chapter Design of Compression Members of Design of Steel Structures

Answer»

Right option is (d) [fy / γm0] / [φ + (φ^2-λ^2)^0.5].

Explanation: The design compressive STRESS, fcd of column is given by fcd = [fy / γm0] / [φ + (φ^2-λ^2)^0.5], where fy is YIELD stress of material, φ is dependent on imperfection FACTOR, λ is non DIMENSIONAL effective SLENDERNESS ratio.



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