Diaphragm Floor Design

In certain cases there can be significant flanking of a wall through structural connections such as a floor diaphragm.
Diaphragm floor design. 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. Section 2305 general design requirements for lateral force resisting systems 2305 1 general. Just as the floor or roof is checked for vertical load capacity it is considered a diaphragm in the plane of the floor and check for shear when designing the lateral force resisting system. A diaphragm is a flat structural unit acting like a deep thin beam.
The term diaphragm is usually applied to roofs and floors. A shear wall however is a vertical cantilevered diaphragm. The hilti profis df diaphragm software version 2 0 1 calculates diaphragm shear flexibility factors and uplift resistance for steel deck roof and floor systems. The program is based on the steel deck institute sdi diaphragm design method and incorporates the latest icc es ac43 performance data.
It is usually constructed of wood sheathing steel deck or concrete. In wood frame buildings there are requirements that there be a fire stop between wall studs or joists supporting a floor.