Roof Wall Diaphram

The maximum average shear r b occurs at the ends of the roof diaphragm.

Roof wall diaphram.

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. Zones near the mid span of the roof are subjected to less unit shear therefore less. Request that any youngster draw a house and theyll draw a house with a peak roof.

Wood frame structural panel diaphragms shall be designed and constructed in accordance with af pa sdpws where panels are. 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. Because this building has one story assume that the seismic weight is concentrated at roof level.

Also assume the mass is evenly distributed over the entire roof. The roof diaphragm design example has for some time been a piece of customary structural history. Main features roof diaphragm design example. 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.

This horizontal element is known as the diaphragm. 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. Assuming a flexible roof diaphragm determine the forces in walls a b c and d for north south loading. At the roof level these wall reactions turn the load in the roof system in the plane of the roof.

134 2015 ibc seaoc structural seismic design manual vol. Roof framing and 3 adequate connections between the roof structure and the top of the wall to create a complete vertical load path. 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. A diaphragm acts like a short deep beam.

Roof dead load 14 psf.