Roof Wall Diaphram

Because this building has one story assume that the seismic weight is concentrated at roof level.

Roof wall diaphram.

The diaphragm forces tend to be transferred to the vertical resisting elements. Wood frame structural panel diaphragms shall be designed and constructed in accordance with af pa sdpws where panels are. The maximum average shear r b occurs at the ends of the roof diaphragm. 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.

5 2012 ibc 2306 2 wood diaphragms 2306 2 1 wood frame structural panel diaphragms. The roof and foundation support the vertically spanning wall and consequently pick up the developed horizontal reactions. The roof diaphragm design example has for some time been a piece of customary structural history. This horizontal element is known as the diaphragm.

Roof dead load 14 psf. Main features roof diaphragm design example. So how has this generally conventional roof diaphragm design example discovered its way into present day engineering. 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.

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

Assuming a flexible roof diaphragm determine the forces in walls a b c and d for north south loading. Request that any youngster draw a house and theyll draw a house with a peak roof. 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.

Zones near the mid span of the roof are subjected to less unit shear therefore less.