Roof Diaphragm Design Example

Design a roof deck for a length of l 500 ft.

Roof diaphragm design example.

Calculate the lateral load on the roof diaphragm. Now let s work on an example. In figure 1 wind pressure on the walls parallel to length l act on the building. 13 5 l x 16 9 x l 13 5 18 ft 16 9 6 ft 24 14 4 psf.

The roof diaphragm design example can go up against different style that when nitty gritty right can ooze a cutting edge feel. The roof diaphragm will take load from half the wall below and load directly applied to the diaphragm. The roof deck is a wr wide rib type panel with a panel width of 36. First off the roof diaphragm design example is an extremely basic direct and utilitarian design every single current trademark.

The manual includes pertinent design information considerations fastener information deck shear capacity tables and a plethora of highly relevant design examples stepping you through all the. Main features roof diaphragm design example. Diaphragms and shear walls are used in the lateral design of a building the structural system is termed a box sys tem shear walls provide reactions for the roof and floor diaphragms and transmit the forces into the foundation. The diaphragm resists the in plane loads by acting as a large horizontal beam spanning between the supporting end walls that are known as shear walls.

A similar design is required in the other orthogonal direction east west. Design the diaphragm for wind loading using allowable stress design method. Lbs ft plf 2. A roof design gives the chance to extra floor space in the roof volume similar to a space or upper room space.

Figure 1 illustrates the basic concept for a roof and wall diaphragm. Section 2305 general design requirements for lateral force resisting systems 2305 1 general. The roof acting as a simple span horizontal girder of depth b distributes the wind line load as a shear reaction along the top of the end walls perpendicular to l. Shear nailing of the roof diaphragm north south the diaphragm loaded in the north south direction has been selected to illustrate the design of a wood structural panel roof diaphragm.

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. Design example 2 n flexible diaphragm design diaphragm unit shear at the east side of line 3 and at line 9 is 136 000 160 850. This horizontal element is known as the diaphragm. The sdi diaphragm design manual third edition is an excellent design reference every engineer should utilize if designing with steel deck diaphragms.

At the roof level these wall reactions turn the load in the roof system in the plane of the roof.