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Wood - WOOD Basic and Fundamental Wood Properties and...

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WOOD Basic and Fundamental Wood Properties and Design Considerations E. Raymond DesOrmeaux E. Raymond DesOrmeaux PE, F. ASCE PE, 1
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WOOD Why Wood? head2right Commonly used head2right Ordinarily plentiful head2right Good strength –compression & tension head2right Works easy –cutting & fastening Some Limitations head2right Fire protection should be addressed head2right Usually the loads are transmitted in one direction head2right Height head2right Bracing head2right Can be moisture sensitive 2
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WOOD Solid Wood Beams head2right Size is limited head2right Availability in beams with large x-section is very limited head2right Lumber species are limited head2right Select grades are limited head2right When longer spans are required, Glu-lam is an alternate head2right Larger members are difficult to locate, and as the size increases, the cost disproportionately increases head2right Either laminated decking (plywood) or solid decking used to span between the members 3
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WOOD JOISTS JOISTS head2right Usually light-weight head2right Spaced closely –commonly 12”, 16”, and 24” on center head2right Limited Span Length –20’ max. (can increase to 25’ +) head2right Check for Bracing –top & bottom chords (twisting or lateral movement) head2right Usually top chord has a decking –plywood, various types of particle board, or sheathing. head2right The decking braces the top chord. head2right The bottom chord must have bracing (commonly called bridging) which prevents the twisting or lateral displacement. 4
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I JOISTS head2right The Top & bottom Chord are usually solid lumber head2right The Chords are separated by a plywood web head2right Commonly used in residential, and some light commercial buildings Advantages: head2right Efficient, similar to a steel wide flange member head2right Has excellent strength, usually better than a solid wood joist, such as a 2 x 12 head2right Fabricated to required size 5
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