# Design of Steel Structures Questions and Answers – Methods and Assumptions of Analysis

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This set of Design of Steel Structures Multiple Choice Questions & Answers (MCQs) focuses on “Methods and Assumptions of Analysis”.

1. The design action effects for design basis earthquake loads is obtained by _____________
a) Elastic Analysis
b) Plastic Analysis
d) Dynamic Analysis

Explanation: The design action effects for design basis earthquake loads is obtained by elastic analysis. The maximum credible earthquake load can be assumed to correspond to load at which significant plastic hinges are formed and shall be obtained by plastic analysis.

2. What is non-sway frame?
a) transverse displacement of one end of member relative to other end is not effectively prevented
b) longitudinal displacement of one end of member relative to other end is not effectively prevented
c) transverse displacement of one end of member relative to other end is effectively prevented
d) longitudinal displacement of one end of member relative to other end is effectively prevented

Explanation: In non-sway frame, transverse displacement of one end of member relative to other end is effectively prevented. Example : in triangulated frames and trusses, in plane stiffeners is provided by bracings or by shear walls, etc.

3. What is sway frame?
a) longitudinal displacement of one end of member relative to other end is not effectively prevented
b) transverse displacement of one end of member relative to other end is effectively prevented
c) longitudinal displacement of one end of member relative to other end is effectively prevented
d) transverse displacement of one end of member relative to other end is not effectively prevented

Explanation: In sway frame, transverse displacement of one end of member relative to other end is not effectively prevented. Such members and frames occur in structure which depend on flexural action of members to resist lateral loads and sway.

4. Which of the following is true about rigid construction?
a) connections between members at their junction does not have sufficient rigidity
b) connections between members at their junction have sufficient rigidity
c) members are not connected
d) connection between members at junction will not resist any moment

Explanation: In rigid construction, connections between members at their junction have sufficient rigidity to hold angles between members connected at joint, unchanged under load.

5. In simple construction, connection between members at their junction will __________
a) resist moment
b) resist force
c) not resist force
d) not resist moment

Explanation: In simple construction, connection between members at their junction will not resist any appreciable moment and shall be assumed to be hinged.

6. What percent of factored load is notional horizontal force?
a) 0.5%
b) 1%
c) 10%
d) 20%

Explanation: Notional horizontal force = 0.5% of factored dead load + vertical imposed load at that level. Notional horizontal force are applied to analyse a frame subjected to gravity loads, considering sway stability of frame.

7. In first order elastic analysis, equilibrium is expressed in terms of ___________
a) geometry of deformed structure
b) geometry of undeformed structure
c) geometry of both deformed and undeformed structure
d) geometry of any structure

Explanation: In first order elastic analysis, equilibrium is expressed in terms of geometry of undeformed structure. This assumption is valid when elastic displacement are small compared to dimensions of structure.

8. Which of the following is not an assumption of first order elastic analysis of rigid jointed frame?
a) materials behave linearly
b) yielding effects can be ignored
c) member instability effects cannot be ignored
d) frame instability effects can be ignored

Explanation: The following are the assumptions of first order elastic analysis of rigid jointed frame : (i) materials behave linearly, (ii) yielding effects can be ignored, (iii) member instability effects such as those caused by axial compression can ignored, (iv) frame behaves linearly frame instability effects such as those caused by moments due to horizontal frame deflection, etc can be ignored.

9. Basic objective of second order elastic analysis is :
a) to calculate external force equilibrium in deformed geometry of structure
b) to calculate internal force equilibrium in deformed geometry of structure
c) to calculate external force equilibrium in undeformed geometry of structure
d) to calculate internal force equilibrium in undeformed geometry of structure

Explanation: Basic objective of second order elastic analysis is to calculate internal force equilibrium in deformed geometry of structure. In this P-Δ effect is also considered.

10. First order analysis yields bending moment equal to those for a _____
a) cantilever beam
b) continuous beam
c) fixed beam
d) simply supported beam

Explanation: First order analysis yields bending moment equal to those for a simply supported beam since material and frame are assumed to behave linearly and member instability effects and frame instability effects can be ignored.

11. When plastic analysis is used, the yield stress of grade of steel used shall not exceed _____
a) 250 MPa
b) 500 MPa
c) 450 MPa
d) 800 MPa

Explanation: When plastic analysis is used, the yield stress of grade of steel used shall not exceed 450 MPa and the stress strain distribution of steel shall not be significantly different from those obtained for steels complying with IS 2062.

Sanfoundry Global Education & Learning Series – Design of Steel Structures.

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