This set of Design of Steel Structures Multiple Choice Questions & Answers (MCQs) focuses on “Design Strength of Laterally Supported Beams – I”.
1. Which of the following aspects need not be considered for beam design?
a) deflection
b) material of beam
c) buckling
d) lateral supports
View Answer
Explanation: The important aspects which need to be considered for beam design are moments, shears, deflection, crippling, buckling, and lateral support.
2. The design bending strength of laterally supported beams is governed by
a) torsion
b) bending
c) lateral torsional buckling
d) yield stress
View Answer
Explanation: The design bending strength of laterally supported beams is governed by yield stress and that of laterally unsupported beams is governed by lateral torsional buckling.
3. The web is susceptible to shear buckling when d/tw
a) <67ε
b) < 2×67ε
c) >67ε
d) < 70ε
View Answer
Explanation: For beams with plastic, compact, semi-compact flanges and slender web (d/tw > 67ε), the web is susceptible to shear buckling before yielding.
4. When there is no shear buckling,
a) Vp = Vn
b) Vp > Vn
c) Vp < Vn
d) Vp = 2Vn
View Answer
Explanation: When there is no shear buckling (d/tw ≤ 67ε), the nominal shear resistance Vn equals plastic shear strength Vp.
5. Plastic shear resistance is given by
a) fy/√3
b) shear area x fy x √3
c) shear area x fy/√3
d) shear area / (fy/√3)
View Answer
Explanation: Plastic shear resistance is given by Vp = shear area x fy/√3.
6. The design shear strength is given by
a) Vn
b) Vn/γm0
c) Vn x γm0
d) γm0
View Answer
Explanation: The design shear strength is given by Vd = Vn/γm0 , where Vn= plastic shear resistance, γm0 = partial factor of safety.
7. The web area will be fully effective when shear force V
a) ≥ 0.6Vd
b) < 0.6Vd
c) ≤ 0.6Vd
d) >2×0.6Vd
View Answer
Explanation: When shear force V ≤ 0.6Vd, the web area will be fully effective and entire cross section of beam will be effective in resisting the moment.
8. Which of the following is true about sections with high shear case V>0.6Vd ?
a) web area is ineffective
b) web area is fully effective
c) flanges will not resist moment
d) moment is not reduced
View Answer
Explanation: When shear exceed the limit V>0.6Vd, web area will be ineffective and only flanges will resist the moment. Because of this for high shear case, moment capacity of beam is reduced.
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