Plywood Roof Diaphragm Design

In its most basic form i e.

Plywood roof diaphragm design.

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. Design and construction recommendations for engineered diaphragm systems in floor shear wall and roof systems. Specified in and installed in accordance with specification requirements ep1 and epg bracing specification. 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.

Design the diaphragm for a roof system consisting of light frame wood trusses spaced at 24 inches o c without block ing. Panel orientation is assumed as load case 1 for load in the n s direction and load case 3 for the e w direction. 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. The seismic force resisting system consists of plywood floor and roof diaphragms and plywood shear walls.

Figure 11 1 1 shows a typical floor plan and figure 11 1 2 shows a longitudinal section and elevation. Steel deck plywood and concrete are all common materials utilized in diaphragm applications. Foundation wall and strip footing system. In building design these loads are typically caused by wind and seismic events although earth and water can exert lateral forces as well.

The building is located in a residential neighborhood a few miles north of downtown seattle. Min max min max min max min max min max min max min max min max min max min max min max min max min max min max. A rectangular uninterrupted plane a diaphragm behaves primarily as if it were a short deep beam figure 1. 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.

Section 2305 general design requirements for lateral force resisting systems 2305 1 general. Whilst the information in this guide was accurate at the time of publication it is the users responsibility to. Diaphragms are a roof floor or other system transferring lateral forces applied to a building to the vertical elements such as the shear walls. Diaphragms and shear walls form l350.

1 applicable to all roof slopes with and without roof irregularities exposure b all slopes.