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In timber roof figure shown below, the part represented by number 2 denotes ____________

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in Civil Engineering Drawing by (128k points)
In timber roof figure shown below, the part represented by number 2 denotes ____________

(a) queen posts

(b) collar beam

(c) tie-beam

(d) straining beam

This question was posed to me in exam.

I need to ask this question from Wooden and Steel Roof Truss topic in portion Different Type Roofs, R.C.C of Civil Engineering Drawing

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The correct choice is (b) collar beam

For explanation I would say: The principal rafters are linked by a collar beam supported by a pair of arch braces, which stiffen the structure and help to transmit the weight of the roof down through the principal rafters to the supporting wall.

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