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

This set of Advanced Design of Steel Structures Questions and Answers focuses on “Design Strength of Laterally Unsupported Beams – II”.

1. Imperfection factor for rolled section is
a) 0.1
b) 0.21
c) 2.1
d) 4.9
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2. Imperfection factor for welded section is
a) 4.9
b) 0.21
c) 2.1
d) 0.49
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3. Non-dimensional slenderness ratio is given by
a) λ_LT = √(β_bZ_pf_y/M_cr)
b) λ_LT = √(β_bZ_pf_yM_cr)
c) λ_LT = √(β_bZ_p/M_cr)
d) λ_LT = √(β_bZ_pf_y)
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4. The check for non- dimensional slenderness ratio is given by
a) λ_LT = 2.4 √(Zef_y/M_cr)
b) λ_LT > 2 .4 √(Zef_y/M_cr)
c) λ_LT ≤ 1.2 √(Zef_y/M_cr)
d) λ_LT ≥ 1.2 √(Zef_y/M_cr)
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5. Which of the following relation is correct?
a) λ_LT = √(f_y/f_cr,b)
b) λ_LT = f_y/f_cr,b
c) λ_LT = (f_y/f_cr,b)²
d) λ_LT = √(f_y f_cr,b)
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6. The elastic critical moment is given by
a) M_cr = β_b f_cr,b
b) M_cr = β_bZ_p / f_cr,b
c) M_cr = β_bZ_p
d) M_cr = β_bZ_p f_cr,b
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7. Warping constant in elastic critical moment is given by
a) (1+β_f)β_f I_y h²_f
b) (1-β_f)β_f I_y h²_f
c) β_f I_y h²_f
d) (1-β_f)/β_f I_y h²_f
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8. St. Venant’s constant is given by
a) ∑b_it_i²/3
b) ∑b_it_i²
c) ∑b_it_i³/3
d) ∑b_it_i
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9. The value of f_cr,b is given by
a) f_cr,b = [1.1π²E/(L_LT/r_y)²]{1+1/20[(L_LT/r_y)/(h_f/t_f)]²}
b) f_cr,b = [1.1π²E/(L_LT/r_y)]{1-1/20[(L_LT/r_y)/(h_f/t_f)]}
c) f_cr,b = [1.1π²E/(L_LT/r_y)²]{1+1/20[(L_LT/r_y)/(h_f/t_f)]²}^0.5
d) f_cr,b = [1.1π²E/(L_LT/r_y)²]{1-1/20[(L_LT/r_y)/(h_f/t_f)]²}^0.5
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Sanfoundry Global Education & Learning Series – Design of Steel Structures.

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