Wind Shear Wall Roof Diaphragm

Diaphragm and shear wall example given.

Wind shear wall roof diaphragm.

Because the wall on the left does not extend the full depth of the diaphragm collector elements are needed to collect the shear from the diaphragm and to transfer it. This force is then applied to the shearwalls at the roof eave height. The term diaphragm is usually applied to roofs and floors. When looking at the wind tributary to a diaphragm in order to calculate the shear wall capacities i normally resolve the wind forces to the roof and half the wall height single story four ext.

A diaphragm is a flat structural unit acting like a deep thin beam. Unblocked diaphragm capacity capacities in sdpws are nominal values. 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. Design roof diaphragm sheathing and shear walls on short side.

The diaphragm forces tend to be transferred to the vertical resisting elements. Function as a diaphragm to transfer lateral loads to the building s shear walls. The fastening requirements are those required to resist uplift forces from wind pressures and shear forces. Diaphragm and shear wall perimeters.

Use apa sheathing tables in x305 peter von buelow university of michigan tcaup slide 19 of 28. Not asd divide nominal values by 2 0 for asd capacity. Structures using wood frame shear walls or wood frame diaphragms to resist wind seismic or other lateral loads shall be designed and constructed in accordance with af pa sdpws and the applicable provisions of sections 2305 2306 and 2307. Walls for simplicity sake.

The ibc irc wfcm and icc 600 all contain prescriptive requirements for fastening roof sheathing. These construction systems can be used when designing a building for lateral loads such as those generated by wind or earthquakes. Wind load diaphragm sheathing floor roof framing parallel to walls add blocking floor joist blocking. A shear wall however is a vertical cantilevered diaphragm.

Illustrated in figure 1 is a diaphragm with an lfrs consisting of structural walls and collector elements.