The value of φ in the equation of design compressive strength is given by(a) φ = 0.5[1-α(λ-0.2)+λ^2].(b) φ = 0.5[1-α(λ-0.2)-+λ^2].(c) φ = 0.5[1+α(λ+0.2)-λ^2].(d) φ = 0.5[1+α(λ-0.2)+λ^2].This question was posed to me in a job interview.My question is based upon Design of Compression Members in chapter Design of Compression Members of Design of Steel Structures

The value of φ in the equation of design compressive strength is give

1.	The value of φ in the equation of design compressive strength is given by(a) φ = 0.5[1-α(λ-0.2)+λ^2].(b) φ = 0.5[1-α(λ-0.2)-+λ^2].(c) φ = 0.5[1+α(λ+0.2)-λ^2].(d) φ = 0.5[1+α(λ-0.2)+λ^2].This question was posed to me in a job interview.My question is based upon Design of Compression Members in chapter Design of Compression Members of Design of Steel Structures
Answer» The CORRECT answer is (d) φ = 0.5[1+α(λ-0.2)+λ^2]. For EXPLANATION: The VALUE of φ in the equation of design compressive strength is given by φ = 0.5[1+α(λ-0.2)+λ^2], where α is imperfection FACTOR(depends on buckling class) and λ is non-dimensional effective slenderness ratio.

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