Structural Analysis Questions and Answers - Influence Lines for Floor Girders

1. What is the main load carrying member in this system?
a) Floor beams
b) Side girders
c) Supporting columns
d) Nowhere

Answer: b
Explanation: Girders are the main load carrying member and its study is important for the analysis of floor load transmission.

2. Load transfer to girders happen at only some points. What are they called?
a) Girder points
b) Panel points
c) Column points
d) Side points

Answer: b
Explanation: They are called panel points and members between these points are called panels

3.Generally, which parts’ ILD is given the most preference?
a) Floor beams
b) Side girders
c) Supporting columns
d) Nowhere

Answer: b
Explanation: Side girders are the main load carrying member of the system, so their ILD is given the most preference.

4.Assuming that we need to determine maximum shear at a point C of a beam, which of the following sentences will always be true for that condition?
a) At least one load at end point
b) At least two load at both the end points
c) One of the loads should be at a point in proximity to point C
d) None of the loads should be at a point in proximity to point C

Answer: c
Explanation: For maximum shear at point C one of the loads should be at a point in proximity (just left or just right) to point C.

5. For a cantilevered beam, where would absolute maximum shear occur?
a) At midpoint
b) Depends upon position of load applied
c) Just next to free end
d) Just next to fixed support

Answer: d
Explanation: We can use method of section to prove the above result while applying load at any arbitrary point.

6. For a simply supported beam, where would absolute maximum shear occur?
a) At midpoint
b) Depends upon position of load applied
c) Just next to one of ends
d) At both of the ends

Answer: c
Explanation: Maximum shear would occur depending upon position load, but it will occur at one of the ends.

7. For a cantilevered beam, where would absolute maximum moment occur?
a) At midpoint
b) Depends upon position of load applied
c) Just next to free end
d) Just next to fixed support

Answer: d
Explanation: It would occur at same point as max. Shear, but loads should be applied at far other end of beam so as to maximize it.

8. For a simply supported beam, where would absolute maximum moment occur?
a) At midpoint
b) Depends upon position of load applied
c) Just next to one of ends
d) At both of the ends

Answer: b
Explanation: One will have to analyze properly to find that point in this case.

9.If there are three point loads acting simultaneously on a simply supported beam, where would absolute max. Moment occur?
a) Beneath smallest force
b) Beneath med. force
c) Beneath largest force
d) Can‘t say

Answer: d
Explanation: One can’t say as it would require analysis, although generally it comes under the greatest force.

10. Approximate analysis is done on a :-
a) Determinate structures
b) Indeterminate structures
c) Determinate and indeterminate structures
d) Depends upon load applied

Answer: a
Explanation: It is done on a determinate structure which is made by converting an indeterminate one.