Roof Wall Diaphragm

A shear wall however is a vertical cantilevered diaphragm.

Roof wall diaphragm.

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. Chords are usually the double top plates of the walls but for simple but jointed members only 1 member is acting at the joint. A composite decking made of solid materials it resembles real wood and particularly strong and stable for bearing heavy load. It is a waterproofing layer made of regular felt stacked above the solid.

Therefore area is for 1 2x4. A roof diaphragm shall be provided by attaching a minimum of 3 8 inch 9 5 mm wood structural panel which complies with section r803 to roof rafters or truss top chords in accordance with table r804 3 buildings with 3 1 or larger plan aspect ratio and with roof rafter slope pitch of 9 12 or larger shall have the roof rafters and ceiling joists blocked in accordance with figure r804 3 7 2. A horizontal timber or metal resting at the peak of the roof the rafters and trusses are connected to the ridge board for a cohesive framework. This stiffness provides stability and replaces the need for other bracing elements.

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. They are comprised of interconnected units attached to supporting members such that the entire assembly possesses both in plane shear strength and stiffness. The diaphragm resists the in plane loads by acting as a large horizontal beam spanning between the supporting end walls that are known as shear walls. The major components of a diaphragm include the individual deck panels the structural members to which they are connected and the connecting devices or fasteners.

A shear wall however is a vertical cantilevered diaphragm. At the roof level these wall reactions turn the load in the roof system in the plane of the roof. This horizontal element is known as the diaphragm. A diaphragm is a flat structural unit acting like a deep thin beam.

These construction systems can be used when designing a building for lateral loads such as those generated by wind or earthquakes. Diaphragm action is an additional capacity of the panel to transfer the lateral loads to the outside edges of the panel to the eave for roof panels and to the ground for wall panels. The term diaphragm is usually applied to roofs and floors. A diaphragm structure results when a series of such vertical and horizontal diaphragms are properly tied together to form a structural unit.

Shear diaphragms are essentially planar structural systems found in roofs floors and walls of buildings.