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Question
Consider the following statements regarding the classification of beams :
1. Floor beams are often referred to as girders.
2. Joist is a beam supporting floor construction but not a major beam.
3. Rafter is a roof beam, usually supported by roof truss.
Which of the above statements are correct?
A.
1 and 2 only
B.
1 and 3 only
C.
2 and 3 only
D.
1, 2 and 3
Answer ( Option A)

1 and 2 only

Solution

Joist: These are small beams supporting floor but not the major beams.
Girder: Beam supporting a number of joints or floor beams.
Rafter: A roof beam usually supporting purlins.
Purlin: A roof beam, usually supported by roof trusses.
So, statements (1) and (2) are correct. 

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