Steel Roof Diaphragm Design Example

Design rigidity means relative rigidity.

Steel roof diaphragm design example.

Design the diaphragm for wind loading using allowable stress design method. The sdi diaphragm design manual third edition is an excellent design reference every engineer should utilize if designing with steel deck diaphragms. Astm a36 fy 36 ksi for structural steel astm a615 gr 40 for 3 4 gr 60 for 5 and larger rebar. And a width b 300 ft.

R divided by length b equals the collector. It should be noted that the flexible diaphragm presented in the example is a conservative approach as it assumes two simple spans. First off the roof diaphragm design example is an extremely basic direct and utilitarian design every single current trademark. The roof deck is a wr wide rib type panel with a panel width of 36.

Design a roof deck for a length of l 500 ft. 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. The sdi diaphragm design manual third edition is an excellent design reference every engineer should utilize if designing with steel deck diaphragms. 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.

Themaximum end reaction r of the roof diaphragm therefore is ww wl x l 2. Main features roof diaphragm design example. For the roof in this example the total uniform load on the diaphragm equals the combined effects of the windward and leeward cladding reactions ww wl. A concrete floor is relatively rigid compared to steel moment frames whereas a metal deck roof is relatively flexible compared to concrete or.

Now let s work on an example. See the attached examples and video to really help better understand general diaphragm design better. Design criteria and specifications a. Timber beam design seismic forces wind forces floor shearwall diagram lateral loads roof diaphragm design shearwall design continuous footing design.

Of importance is the in plane rigidity of the diaphragm relative to the walls or frame elements that transmit the lateral forces to the ground figure 4 29. The actual behavior may more closely resemble a continuous beam with intermediate supports. The roof diaphragm design example can go up against different style that when nitty gritty right can ooze a cutting edge feel.