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.
Steel roof diaphragm design example.
The actual behavior may more closely resemble a continuous beam with intermediate supports.
A concrete floor is relatively rigid compared to steel moment frames whereas a metal deck roof is relatively flexible compared to concrete or.
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.
Now let s work on an example.
The roof diaphragm design example can go up against different style that when nitty gritty right can ooze a cutting edge feel.
Design a roof deck for a length of l 500 ft.
The roof deck is a wr wide rib type panel with a panel width of 36.
The sdi diaphragm design manual third edition is an excellent design reference every engineer should utilize if designing with steel deck diaphragms.
Design rigidity means relative rigidity.
R divided by length b equals the collector.
Main features roof diaphragm design example.
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.
Design criteria and specifications a.
Themaximum end reaction r of the roof diaphragm therefore is ww wl x l 2.
See the attached examples and video to really help better understand general diaphragm design better.
And a width b 300 ft.
2003 international building code.
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 roof deck is supported by joists that are thick and spaced at 5 ft.
Timber beam design seismic forces wind forces floor shearwall diagram lateral loads roof diaphragm design shearwall design continuous footing design.
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.
It should be noted that the flexible diaphragm presented in the example is a conservative approach as it assumes two simple spans.
