Roof Wall Diaphram

Roof framing and 3 adequate connections between the roof structure and the top of the wall to create a complete vertical load path. The roof diaphragm design example has for some time been a piece of customary structural history. So how has this generally conventional roof diaphragm design example discovered its way into present day engineering.

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Roof wall diaphram.

Zones near the mid span of the roof are subjected to less unit shear therefore less. Assuming a flexible roof diaphragm determine the forces in walls a b c and d for north south loading. This horizontal element is known as the diaphragm. In structural engineering a diaphragm is a structural element that transmits lateral loads to the vertical resisting elements of a structure such as shear walls or frames diaphragms are typically horizontal but can be sloped such as in a gable roof on a wood structure or concrete ramp in a parking garage.

134 2015 ibc seaoc structural seismic design manual vol. Main features roof diaphragm design example. Because this building has one story assume that the seismic weight is concentrated at roof level. It should also be noted that.

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. Also assume the mass is evenly distributed over the entire roof. A diaphragm acts like a short deep beam. However the wall diaphragm moment equals r x h.

Side wall carries load to roof diaphragm at top and to foundation at bottom roof horizontal diaphragm carries load to end walls end wall vertical diaphragm or shear wall carries load to foundation v lb per lin ft of diaphragm width w lb per lin ft of wall f t lb c vh h 2 wl 2b wind load lb per sq ft figure 1. At the roof level these wall reactions turn the load in the roof system in the plane of the roof. The maximum average shear r b occurs at the ends of the roof diaphragm. 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.

Request that any youngster draw a house and theyll draw a house with a peak roof. The roof and foundation support the vertically spanning wall and consequently pick up the developed horizontal reactions. The diaphragm forces tend to be transferred to the vertical resisting elements. 5 2012 ibc 2306 2 wood diaphragms 2306 2 1 wood frame structural panel diaphragms.

Wood frame structural panel diaphragms shall be designed and constructed in accordance with af pa sdpws where panels are.

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