Design of Steel Structures Question Bank on “Compression Members and Loads on Compression Members”.
1. What is compression member?
a) structural member subjected to tensile force
b) structural member subjected to compressive force
c) structural member subjected to bending moment
d) structural member subjected to torsion
Answer: b
Clarification: Structural member which is subjected to compressive forces along its axis is called compression member. Compression members are subjected to loads that tend to decrease their lengths.
2. Which of the following is true about axially loaded column?
a) member subjected to bending moment
b) member subjected to axial force and bending moment
c) net end moments are not zero
d) net end moments are zero
Answer: d
Clarification: if the net end moments are zero, the compression member is required to resist load acting concentric to original longitudinal axis of member and is called axially loaded column or simply column.
3. Which of the following is true about beam column?
a) member subjected to bending moment
b) member subjected to axial force only
c) member subjected to axial force and bending moment
d) net end moments are zero
Answer: c
Clarification: If the net end moments are not zero, the member will be subjected to axial force and bending moments along its length. Such members are called beam-columns.
4. What are columns?
a) vertical compression members in a building supporting floors or girders
b) vertical tension members in a building supporting floors or girders
c) horizontal compression members in a building supporting floors or girders
d) horizontal tension members in a building supporting floors or girders
Answer: a
Clarification: The vertical compression members in a building supporting floors or girders are normally called as columns. They are sometimes called as stanchions. They are subjected to heavy loads. Vertical compression members are sometimes called posts.
5. Which of the following are true about roof trusses?
a) principal rafter are compression members used in buildings
b) principal rafter is bottom chord member of roof truss
c) struts are compression members used in roof trusses
d) struts are tension members used in roof trusses
Answer: c
Clarification: The compression members used in roof trusses and bracings are called as struts. They may be vertical or inclined and normally have small lengths. the top chord members of a roof truss are called principal rafter.
6. Knee braces are __________
a) long compression members
b) short compression members
c) long tension members
d) short tension members
Answer: b
Clarification: Short compression members at junction of columns and roof trusses or beams are called knee braces. They are provided to avoid moment.
7. Which of the following is not a load on columns in buildings?
a) load from floors
b) load from foundation
c) load from roofs
d) load from walls
Answer: b
Clarification: Axial loading on columns in buildings is due to loads from roofs, floors, and walls transmitted to the column through beams and also due to its own self weight.
8. Which of the following is correct?
a) moment due to wind loads is not considered in unbraced buildings
b) wind load cause large moments in braced buildings
c) wind loads in multi-storey buildings are not usually applied at respective floor levels
d) wind loads in multi-storey buildings are usually applied at respective floor levels
Answer: d
Clarification: Wind loads in multi-storey buildings are usually applied at respective floor levels and are assumed to be resisted by bracings. Hence in braced buildings wind loads do not cause large moments. But, in unbraced rigid framed buildings, the moment due to wind loads should also be taken into account in the design of columns.
9. What are loads on columns in industrial buildings?
a) wind load only
b) crane load only
c) wind and crane load
d) load from foundation
Answer: c
Clarification: In industrial buildings, loads from crane and wind cause moments in columns. In such cases, wind load is applied to the column through sheeting rails and may be taken as uniformly distributed throughout the length of column.
10. The strength of column does not depend on
a) width of building
b) material of column
c) cross sectional configuration
d) length of column
Answer: a
Clarification: The strength of column depends on material of column, cross sectional configuration, length of column, support conditions at the ends, residual stresses, imperfections.
11. Which of the following is not an imperfection in column?
a) material not being isotropic
b) geometric variations of columns
c) material being homogenous
d) eccentricity of load
Answer: c
Clarification: Imperfections in column include material not being isotropic and homogenous, geometric variations of columns and eccentricity of load.
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