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/t_{w}

a) <67ε

b) < 2×67ε

c) >67ε

d) < 70ε

View Answer

Explanation: For beams with plastic, compact, semi-compact flanges and slender web (d/t

_{w}> 67ε), the web is susceptible to shear buckling before yielding.

4. When there is no shear buckling,

a) V_{p} = V_{n}

b) V_{p} > V_{n}

c) V_{p} < V_{n}

d) V_{p} = 2V_{n}

View Answer

Explanation: When there is no shear buckling (d/t

_{w}≤ 67ε), the nominal shear resistance V

_{n}equals plastic shear strength V

_{p}.

5. Plastic shear resistance is given by

a) f_{y}/√3

b) shear area x f_{y} x √3

c) shear area x f_{y}/√3

d) shear area / (f_{y}/√3)

View Answer

Explanation: Plastic shear resistance is given by V

_{p}= shear area x f

_{y}/√3.

6. The design shear strength is given by

a) V_{n}

b) V_{n}/γ_{m0}

c) V_{n} x γ_{m0}

d) γ_{m0}

View Answer

Explanation: The design shear strength is given by V

_{d}= V

_{n}/γ

_{m0}, where V

_{n}= plastic shear resistance, γ

_{m0}= partial factor of safety.

7. The web area will be fully effective when shear force V

a) ≥ 0.6V_{d}

b) < 0.6V_{d}

c) ≤ 0.6V_{d}

d) >2×0.6V_{d}

View Answer

Explanation: When shear force V ≤ 0.6V

_{d}, 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>0.6V_{d} ?

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>0.6V

_{d}, 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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