# Structural Analysis Questions and Answers – Analysis of Frames : No Sidesway-III

This set of Structural Analysis Questions and Answers for Aptitude test focuses on “Analysis of Frames : No Sidesway-III”.

A and C are fixed supports. M acts at point B in clockwise direction. AB = BC = L. EI is constant throughout the frame.

1. What will be the value of Mba?
a) M/4
b) –M/4
c) M/2
d) –M/2

Explanation: conserve moment at joint B.

2. What will be the value of Mbc?
a) M/4
b) –M/4
c) M/2
d) –M/2

Explanation: Value of Mba and Mbc will be numerically equal as they both yield exact same equations.

3. What will be the value of Mab?
a) M/4
b) –M/4
c) M/2
d) –M/2

Explanation: Since end A is fixed, half of Mba will be transferred to point A and its direction will remain same.

4. What will be the value of Mcb?
a) M/4
b) –M/4
c) M/2
d) –M/2

Explanation: Since end C is fixed, half of Mbc will be transferred to point A and its direction will remain same.
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5. What will be the value of rotation at point B?
a) ML/EI
b) ML/2EI
c) ML/4EI
d) ML/8EI

Explanation: Just equate any of Mbc or Mba with its value.

6. What will be the vertical force at point A?
a) M/4L
b) 4M/L
c) -3M/4L
d) M/2L

Explanation: Separate out member AB and conserve moment about point B.

7. What will be the vertical force at point C?
a) M/4L
b) 4M/L
c) 3M/4L
d) M/2L

Explanation: Conserve vertical force in the entire frame.

8. What will be the horizontal force at point C?
a) M/4L
b) -3M/4L
c) 3M/4L
d) M/2L

Explanation: Separate out member BC and conserve moment about point B.

9. What will be the horizontal force at point A?
a) M/4L
b) -3M/4L
c) 3M/4L
d) M/2L

Explanation: Conserve horizontal force in the entire frame.

AB = BC = CD = 20m
All moment options are given in KN/m and all rotations in rad.
EI is constant.

10. This beam is a sway frame.
State whether this statement is true or false.
a) true
b) false

Explanation: This frame is a non-sway frame as all supports, member and loading is symmetrical.

11. If value of EI in right frame member was twice that of the left one then this frame will be a sway one.
State whether this statement is true or false.
a) true
b) false

Explanation: In that case, members won’t remain symmetric anymore and beams will deflect.

12. What will be the value of FEMBC?
a) 66.7
b) -66.7
c) -160
d) 160

Explanation: Formula for FEM in this type of loading is PL2/12 and direction will be anticlockwise.

13. What will be the value of FEMCB?
a) 66.7
b) -66.7
c) -160
d) 160

Explanation: Formula for FEM in this type of loading is PL2/12 and direction will be clockwise.

14. What will be the value of rotation at point A?
a) 137.1/EI
b) -137.1/EI
c) 0
d) 100/EI

Explanation: There won’t be any rotation at point A as it is a fixed support.

15. What will be the value of rotation at point D?
a) 137.1/EI
b) -137.1/EI
c) 0
d) 100/EI

Explanation: There won’t be any rotation at point D as it is a fixed support.

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