Steel Roof Diaphragm Design Example

Main features roof diaphragm design example.

Steel roof diaphragm design example. A roof design gives the chance to extra floor space in the roof volume similar to a space or upper room space. Themaximum end reaction r of the roof diaphragm therefore is ww wl x l 2. Now let s work on an example. The actual behavior may more closely resemble a continuous beam with intermediate supports.

Design a roof deck for a length of l 500 ft. It should be noted that the flexible diaphragm presented in the example is a conservative approach as it assumes two simple spans. 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. The roof diaphragm design example can go up against different style that when nitty gritty right can ooze a cutting edge feel.

The roof deck is supported by joists that are thick and spaced at 5 ft. Design the diaphragm for wind loading using allowable stress design method. The roof deck is a wr wide rib type panel with a panel width of 36. Astm a36 fy 36 ksi for structural steel astm a615 gr 40 for 3 4 gr 60 for 5 and larger rebar.

R divided by length b equals the collector. 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. Design criteria and specifications a.

2003 international building code. See the attached examples and video to really help better understand general diaphragm design better. A concrete floor is relatively rigid compared to steel moment frames whereas a metal deck roof is relatively flexible compared to concrete or. 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. Timber beam design seismic forces wind forces floor shearwall diagram lateral loads roof diaphragm design shearwall design continuous footing design. Design rigidity means relative rigidity.