# Design of Steel Structures Questions and Answers – Design of Compression Members – I

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This set of Design of Steel Structures Multiple Choice Questions & Answers (MCQs) focuses on “Design of Compression Members – I”.

1. A column that can support same load in compression as it can in tension is called
a) intermediate column
b) long column
c) short column
d) cannot be determined

Explanation: A column that can support same load in compression as it can in tension is called short column. Short column usually fail by crushing.

2. The strength of compression members subjected to axial compression is defined by curves corresponding to _______ classes
a) a, b, c and d
b) a, d
c) b, e, f
d) e, f, g

Explanation: The strength of compression members subjected to axial compression is defined by curves corresponding to a, b, c and d classes. The value of imperfection factor depends on type of buckling curve.

3. Which of the following is not a compression member?
a) strut
b) boom
c) tie
d) rafter

Explanation: Strut, boom and rafter are compression members, whereas tie is a tension member.

4. The best compression member section generally used is
a) single angle section
b) I-section
c) double angle section
d) channel section

Explanation: Generally, ISHB sections are used as compression members.

5. The best double-angle compression member section is
a) unequal angles with short leg connected
b) unequal angles with long leg connected
c) unequal angles on opposite side of gusset plate
d) unequal angles on same side of gusset plate

Explanation: Unequal angles with short leg connected are preferred as compression member section.

6. The flange is classified as semi-compact if outstand element of compression flange of rolled section is less than
a) 8.4ε
b) 10.5ε
c) 15.7ε
d) 9.4ε

Explanation: The flange is classified as semi-compact if outstand element of compression flange of rolled section is less than 15.7ε and for a welded section, less than 13.6ε.

7. The flange is classified as plastic if outstand element of compression flange of rolled section is less than
a) 8.4ε
b) 9.4ε
c) 10.5ε
d) 15.7ε

Explanation: The flange is classified as plastic if outstand element of compression flange of rolled section is less than 9.4ε and for a welded section, less than 8.4ε.

8. The outstand element of compression flange of a rolled section is 10.2 (ε=1). The flange will be classified as
a) compact
b) plastic
c) semi-compact
d) slender

Explanation: The flange is classified as compact if outstand element of compression flange of rolled section is less than 10.5ε and for a welded section, less than 9.4ε.

9. The design compressive stress of compression member in IS 800 is given by
a) Rankine Formula
b) Euler Formula
c) Perry-Robertson formula
d) Secant-Rankine formula

Explanation: The design compressive stress of axially loaded compression member in IS 800 is given by Perry-Robertson formula. IS 800:2007 proposes multiple columns curves in nin-dimensional form based on Perry-Robertson approach.

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