Design of Steel Structures Questions and Answers – Design Strength of Laterally Unsupported Beams – I

This set of Design of Steel Structures Multiple Choice Questions & Answers (MCQs) focuses on “Design Strength of Laterally Unsupported Beams – I”.

1. The design bending strength of laterally unsupported beams is governed by
a) torsion
b) bending
c) lateral torsional buckling
d) yield stress
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2. The effect of lateral-torsional buckling need not be considered when
a) λ_LT ≤ 0.4
b) λ_LT ≥0.4
c) λ_LT > 0.8
d) λ_LT = 0.8
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3. The bending strength of laterally unsupported beams is given by
a) M_d = β_bZ_p /f_bd
b) M_d = β_b /Z_pf_bd
c) M_d = β_bZ_p
d) M_d = β_bZ_pf_bd
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4. The value of β_b in the equation of design bending strength of laterally unsupported beams for plastic sections is
a) 0.5
b) 2.5
c) 1.0
d) 1.5
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5. The value of β_b in the equation of design bending strength of laterally unsupported beams for semi-compact sections is
a) Z_e/Z_p
b) Z_eZ_p
c) Z_p/Z_e
d) Z_p
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6. The value of design bending compressive stress f_bd is
a) X_LT f_y
b) X_LT f_y /f_y
c) X_LT f_y f_y
d) X_LT /f_y
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7. The bending stress reduction factor to account for lateral buckling is given by
a) X_LT = 1/{φ_LT + (φ²_LT – λ²_LT)}
b) X_LT = 1/{φ_LT – (φ²_LT + λ²_LT)}
c) X_LT = 1/{φ_LT – (φ²_LT + λ²_LT)0.5}
d) X_LT = 1/{φ_LT + (φ²_LT – λ²_LT)0.5}
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8. The value of φ_LT in bending stress reduction factor is given by
a) φ_LT = [ 1 – α_LT (λ_LT + 0.2) + λ²_LT].
b) φ_LT = [ 1 + α_LT (λ_LT – 0.2) + λ²_LT].
c) φ_LT = 0.5 [ 1 – α_LT (λ_LT + 0.2) + λ²_LT].
d) φ_LT = 0.5 [ 1 + α_LT (λ_LT – 0.2) + λ²_LT].
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Sanfoundry Global Education & Learning Series – Design of Steel Structures.

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