Plywood Roof Diaphragm Design

2018 disclaimer the advice provided in this publication is general in nature and is intended as a guide only.

Plywood roof diaphragm design.

A rectangular uninterrupted plane a diaphragm behaves primarily as if it were a short deep beam figure 1. 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. The seismic force resisting system consists of plywood floor and roof diaphragms and plywood shear walls. 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.

Specified in and installed in accordance with specification requirements ep1 and epg bracing specification. 1 applicable to all roof slopes with and without roof irregularities exposure b all slopes. Diaphragms and shear walls form l350. Whilst the information in this guide was accurate at the time of publication it is the users responsibility to.

Or installed as a structural ceiling diaphragm in accordance with section 13 nzs 3604. In its most basic form i e. Figure 11 1 1 shows a typical floor plan and figure 11 1 2 shows a longitudinal section and elevation. Foundation wall and strip footing system.

Section 2305 general design requirements for lateral force resisting systems 2305 1 general. The building is located in a residential neighborhood a few miles north of downtown seattle. Table 3 16a1 roof diaphragm limits for wind. 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.

Panel orientation is assumed as load case 1 for load in the n s direction and load case 3 for the e w direction. Steel deck plywood and concrete are all common materials utilized in diaphragm applications. 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. Diaphragms are a roof floor or other system transferring lateral forces applied to a building to the vertical elements such as the shear walls.

Design the diaphragm for a roof system consisting of light frame wood trusses spaced at 24 inches o c without block ing.