Roof Diaphragm Unit Shear

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.

Roof diaphragm unit shear.

The allowable shear capacities in tables 2306 2 1 1 and 2306 2 1 2 are permitted to be increased 40 percent for wind design. Max shear diaphragm reaction at shearwall diaphragm unit shear reaction length of diaphragm plf. From floor diaphragm to shear. Af pa sdpws shall be met and wood structural panel diaphragms are permitted to resist horizontal forces using the allowable shear capacities set forth in table 2306 2 1 1 or 2306 2 1 2.

A shear wall however is a vertical cantilevered diaphragm. This horizontal element is known as the diaphragm. Shear diaphragms are essentially planar structural systems found in roofs floors and walls of buildings. A diaphragm is a flat structural unit acting like a deep thin beam.

Diaphragm unit shear at the east side of line 3 and at line 9 is 136 000 160 850. A diaphragm is a flat structural unit acting like a deep thin beam. Diaphragm apparent shear stiffness ga 14 kips in. A shear wall however is a vertical cantilevered diaphragm.

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. The new or enhanced chord member must be anchored into the diaphragm for unit shear transfer. At the roof level these wall reactions turn the load in the roof system in the plane of the roof.

Fastening of the chord or chord enhancement should not inhibit this slip. Lbs ft plf 2. The term diaphragm is usually applied to roofs and floors. Blocked diaphragm all panel edges are supported by and nailed to framing member unblocked diaphragm only the short 4 ft edge is supported by framing member.

As a wood sheathed diaphragm is loaded slip will occur between the perimeter framing member and the sheathing. Drag strut at the edge of the diaphragm it distributed the shear force from one diaphragm to another e g. Anchorage for shear transfer is also discussed in section 22 2 3. Sdpws table 4 2a diaphragm allowable unit shear capacity for seismic v s asd 255 plf sdpws table 4 2a.

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. These construction systems can be used when designing a building for lateral loads such as those generated by wind or earthquakes.