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In timber roof figure shown below, the part represented by number 1 denotes _________(a) collar beam(b) principal rafters(c) queen posts(d) qrch braces |
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Answer» Right answer is (b) principal rafters 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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