Wind Shear Wall Force Roof Diaphragm

An accurate method for engi neering diaphragms has evolved from analytic mod els and extensive testing and.

Wind shear wall force roof diaphragm.

Components will function together as a system. The corresponding diaphragm chord forces are therefore equal to m divided by the diaphragm depth b. These forces are different than diaphragm design forces. Wind load diaphragm sheathing floor roof framing perpendicular to walls floor joist.

Where φ 0 75 and v n is determined in accordance with the shear friction provisions of aci 318 section 22 9 4 2. The edges or ends of diaphragms and shear walls are critical. 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. Calculating diaphragm forces awc design aid 6 max shear at ends max moment at mid span.

Figure 7 1 illustrates how the shear wall transfers the. Asce 7 10 outlines the procedure for calculating diaphragm design forces. A shear wall however is a vertical cantilevered diaphragm. Commercial roof diaphragm trussed roof 2x lumber capacity 350 plf case 1 peter von buelow university of michigan tcaup slide 9 of 28 three shear wall types design considerations.

Diaphragms and shear walls are used in the lateral design of a building the structural system is termed a box sys tem shear walls provide reactions for the roof and floor diaphragms and transmit the forces into the foundation. Diaphragm selection for shear force roof and floor diaphragms example 2. Wood frame shear wall and diaphragm design ricky mclain ms pe se. The term diaphragm is usually applied to roofs and floors.

The maximum roof diaphragm moment m equals ww wl x l2 8. It should also be noted that. The maximum unit shear on the wall diaphragm is also equal to the roof reaction r divided by b. The strength requirement for shear transfer between the diaphragm and wall b is.

When diaphragms and shear walls are connected it is critical that this connection allows loads to be passed in order to ensure that these. A diaphragm is a flat structural unit acting like a deep thin beam. Stud to diaphragm wind load. The forces described in the previous section are the forces seismic base shear puts on the frames walls.

Walls for simplicity sake. These construction systems can be used when designing a building for lateral loads such as those generated by wind or earthquakes. Adjacent to wall b the uniform shear force in the diaphragm is equal to r b l which is the same unit shear force in the wall.