Roof Wall Diaphram
Request that any youngster draw a house and theyll draw a house with a peak roof.
Roof wall diaphram. Assuming a flexible roof diaphragm determine the forces in walls a b c and d for north south loading. Main features roof diaphragm design example. So how has this generally conventional roof diaphragm design example discovered its way into present day engineering. Zones near the mid span of the roof are subjected to less unit shear therefore less.
However the wall diaphragm moment equals r x h. This horizontal element is known as the diaphragm. Because this building has one story assume that the seismic weight is concentrated at roof level. 2 design example 2 n flexible diaphragm design the uniform loads w 1 and w 2 in the east west direction are computed using the diaphragm lengths and wall heights.
The roof and foundation support the vertically spanning wall and consequently pick up the developed horizontal reactions. The roof structure consisting of the roof framing roof decking sheathing and any internal bracing also functions as a horizontal diaphragm and transfers the horizontal loads. Roof dead load 14 psf. Also assume the mass is evenly distributed over the entire roof.
134 2015 ibc seaoc structural seismic design manual vol. It should also be noted that. Wood frame structural panel diaphragms shall be designed and constructed in accordance with af pa sdpws where panels are. The roof diaphragm design example has for some time been a piece of customary structural history.
The diaphragm forces tend to be transferred to the vertical resisting elements. The maximum average shear r b occurs at the ends of the roof diaphragm. A diaphragm acts like a short deep beam. Roof framing and 3 adequate connections between the roof structure and the top of the wall to create a complete vertical load path.
5 2012 ibc 2306 2 wood diaphragms 2306 2 1 wood frame structural panel diaphragms.