Plywood Roof Diaphragm Design

Structures using wood frame shear walls or wood frame diaphragms to resist wind seismic or other lateral loads shall be designed and constructed in accordance with af pa sdpws and the applicable provisions of sections 2305 2306 and 2307. Section 2305 general design requirements for lateral force resisting systems 2305 1 general. In building design these loads are typically caused by wind and seismic events although earth and water can exert lateral forces as well.

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Span To Depth Ratio Of A Plywood Diaphragm Is 4 1 Prevents Excessive Deflection Concrete Wood Layout Structure Architecture

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Panel orientation is assumed as load case 1 for load in the n s direction and load case 3 for the e w direction.

Plywood roof diaphragm design.

The seismic force resisting system consists of plywood floor and roof diaphragms and plywood shear walls. Design the diaphragm for a roof system consisting of light frame wood trusses spaced at 24 inches o c without block ing. Diaphragms are a roof floor or other system transferring lateral forces applied to a building to the vertical elements such as the shear walls. The building is located in a residential neighborhood a few miles north of downtown seattle.

Figure 11 1 1 shows a typical floor plan and figure 11 1 2 shows a longitudinal section and elevation. 1 applicable to all roof slopes with and without roof irregularities exposure b all slopes. Foundation wall and strip footing system. 2018 disclaimer the advice provided in this publication is general in nature and is intended as a guide only.

Whilst the information in this guide was accurate at the time of publication it is the users responsibility to. Table 3 16a1 roof diaphragm limits for wind. 12 4 36 4 36 4 36 4 36 4 36 4 36 4 36 4 36 4 36 4 36 4 35 4 31 5 28 6 24. For wood structures diaphragms are commonly constructed of wood structural panel wsp sheathing or decking applied to the upper face of regularly spaced floor or roof wood framing members such as joists trusses purlins or sub purlins.

Scope of use ecoply structural plywood specified in accordance with the current ecoply specification installation guide or subject to specific engineering design is suitable for use as structural bracing and ceiling diaphragms when. Specified in and installed in accordance with specification requirements ep1 and epg bracing specification. In its most basic form i e. A rectangular uninterrupted plane a diaphragm behaves primarily as if it were a short deep beam figure 1.

Diaphragms and shear walls form l350. Design and construction recommendations for engineered diaphragm systems in floor shear wall and roof systems. Or installed as a structural ceiling diaphragm in accordance with section 13 nzs 3604. Steel deck plywood and concrete are all common materials utilized in diaphragm applications.

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