Roof Deck Diaphragm Design Example

The sdi diaphragm design manual third edition is an excellent design reference every engineer should utilize if designing with steel deck diaphragms.

Roof deck diaphragm design example.

This example illustrates the design of a large flexible diaphragm in a big box retail store subjected to lateral seismic loading. Design the diaphragm for wind loading using allowable stress design method. And a width b 300 ft. 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.

Main features roof diaphragm design example. The roof structure consists of a panelized hybrid roof system which is very common in large diaphragm roofs in the seismically active western united states. The roof deck is supported by joists that are thick and spaced at 5 ft. The roof diaphragm design example can go up against different style that when nitty gritty right can ooze a cutting edge feel.

A line load reaction of this pressure is distributed to the top of the wall at the roof plane via the vertical spanning capacity of the cladding over height h. The sdi diaphragm design manual third edition is an excellent design reference every engineer should utilize if designing with steel deck diaphragms. First off the roof diaphragm design example is an extremely basic direct and utilitarian design every single current trademark. Now let s work on an example.

Figure 1 illustrates the basic concept for a roof and wall diaphragm. In figure 1 wind pressure on the walls parallel to length l act on the building. A roof design gives the chance to extra floor space in the roof volume similar to a space or upper room space. Design a roof deck for a length of l 500 ft.