This set of Structural Analysis Multiple Choice Questions & Answers (MCQs) focuses on “Lateral Loads on Building Frames: Portal and Cantilever Method”.
1. A building bent deflects in the way same as a:-
a) Cantilever beam
b) Fixed beam
c) Truss system
d) Portal frame
View Answer
Explanation: There too, we assume inflection points a centre of columns.
2. What the relation between shear carried by interior and exterior columns of a bent?
a) Interior is double of exterior
b) Exterior is double of interior
c) Both carry same shear
d) Depends upon magnitude of load carried
View Answer
Explanation: We assume that each column is a member of portal frames, then interior columns will be a superposition of two portal frames and it will carry twice the shear.
3. How many assumptions are made in portal method for analyzing fixed-supported building?
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: It is similar to analyzing a fixed supported portal frame.
4. Portal method is more suitable for building having:-
a) High elevation
b) Low elevation
c) Medium elevation
d) Elevation don’t matter
View Answer
Explanation: On comparing with more exact indeterminate analysis, portal method is more suitable for lower elevation.
5. Portal method is suitable for non-uniformly framed buildings.
State whether the above statement is true or false
a) True
b) False
View Answer
Explanation: It is suitable for uniformly framed buildings due to structure’s action under load.
6. Where is inflection point in girder assumed in building fames while using portal method?
a) At one of the end points
b) At both of the end points
c) At centre of each girder
d) No point is assumed
View Answer
Explanation: It works in the same way as analysis of a portal frame.
7. Cantilever method is based upon same action as a long cantilever beam subjected to a :-
a) Transverse load
b) Axial load
c) Moment
d) No load
View Answer
Explanation: Cantilever method is based upon same action as a long cantilever beam subjected to a transverse load.
8. Axial force in column is always tensile.
a) True
b) False
View Answer
Explanation: Axial column in column is tensile on one side of the neutral axis and compressive on other side of neutral axis.
9. How does axial stress vary from neutral axis?
a) Parabolically
b) Hyperbolically
c) Linearly
d) Arbitrarily
View Answer
Explanation: Just like in a cantilever beam, axial stress has a linear variation from neutral axis.
10. Cantilever beam is appropriate if frame is short and thick.
State whether the above statement is true or false
a) True
b) False
View Answer
Explanation: Cantilever beam is appropriate if frame is long and slender.
11. How many assumptions are made in cantilever method for solving a building frame?
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: Regardless of methods, degree of indeterminacy is 3. So, there will always be 3 assumptions.
12. Where does neutral axis of column lie?
a) Vertical plane
b) Horizontal plane
c) Both of them
d) Neither of them
View Answer
Explanation: As neutral axis passes through vertical columns which lie in horizontal axis (axis wise).
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