Design rigidity means relative rigidity.
Steel roof diaphragm design example.
Design criteria and specifications a.
Astm a36 fy 36 ksi for structural steel astm a615 gr 40 for 3 4 gr 60 for 5 and larger rebar.
A roof design gives the chance to extra floor space in the roof volume similar to a space or upper room space.
The sdi diaphragm design manual third edition is an excellent design reference every engineer should utilize if designing with steel deck diaphragms.
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.
Now let s work on an example.
The roof deck is supported by joists that are thick and spaced at 5 ft.
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.
Themaximum end reaction r of the roof diaphragm therefore is ww wl x l 2.
Design the diaphragm for wind loading using allowable stress design method.
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.
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.
First off the roof diaphragm design example is an extremely basic direct and utilitarian design every single current trademark.
R divided by length b equals the collector.
The actual behavior may more closely resemble a continuous beam with intermediate supports.
Design a roof deck for a length of l 500 ft.
Main features roof diaphragm design example.
And a width b 300 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.
Timber beam design seismic forces wind forces floor shearwall diagram lateral loads roof diaphragm design shearwall design continuous footing design.
