The collar beam in a collar beam roof performs which of the following functions?
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A.
It supports the ridge beam.
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B.
It forms an extension to the eaves.
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C.
It ties the wall plates together.
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D.
It prevents rafters from bending.
Correct Answer:
D. It prevents rafters from bending.
Explanation:
The correct answer is It prevents rafters from bending.
In a collar beam roof, the collar beam is a horizontal member that connects a pair of rafters at a point between the wall plate and the ridge. Its primary purpose is to act as a structural tie or strut that minimizes the span of the rafters, thereby preventing them from sagging or bending under the weight of the roofing material or external loads like wind and snow. While it provides stability against outward thrust, its specific functional role in this configuration is to ensure the rafters maintain their structural integrity and do not deflect.
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