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Building Design and Construction Handbook - Merritt - Ventech!

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WOOD CONSTRUCTION 10.75<br />

FIGURE 10.21 Schematics of some moment<br />

connections for timber arches: (a) <strong>and</strong> (b) connections<br />

with top <strong>and</strong> bottom steel plates; (c) connection<br />

with side plates.<br />

(within 6 in of being in line) should be separated by at least two courses. All pieces<br />

should rest on at least one support, <strong>and</strong> not more than one end joint should fall<br />

between supports in each course.<br />

In Type 3, every third course is simple span. Pieces in other courses cantilever<br />

over supports <strong>and</strong> end joints fall at alternate quarter or third points of the spans.<br />

Each piece rests on at least one support.<br />

To restrain laterally supporting members of 2-in deck in Types 2 <strong>and</strong> 3, the<br />

pieces in the first <strong>and</strong> second courses <strong>and</strong> in every seventh course should bear on<br />

at least two supports. End joints in the first course should not occur on the same<br />

supports as end joints in the second course unless some construction, such as plywood<br />

overlayment, provides continuity. Nail end distance should be sufficient to<br />

develop the lateral nail strength required.<br />

Heavy-timber decking is laid with wide faces bearing on the supports. Each<br />

piece must be nailed to each support. For 2-in decking a 3 1 ⁄2-in (16d) toe <strong>and</strong> face<br />

nail should be used in each 6-in-wide piece at supports, with three nails for wider

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