Wind Shear Wall Force Roof 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.

Wind shear wall force roof diaphragm.

The strength requirement for shear transfer between the diaphragm and wall b is. An accurate method for engi neering diaphragms has evolved from analytic mod els and extensive testing and. These construction systems can be used when designing a building for lateral loads such as those generated by wind or earthquakes. The edges or ends of diaphragms and shear walls are critical.

Components will function together as a system. 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. However the wall diaphragm moment equals r x h. 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.

The maximum unit shear on the wall diaphragm is also equal to the roof reaction r divided by b. This force is then applied to the shearwalls at the roof eave height. A diaphragm is a flat structural unit acting like a deep thin beam. Walls for simplicity sake.

Figure 7 1 illustrates how the shear wall transfers the. When diaphragms and shear walls are connected it is critical that this connection allows loads to be passed in order to ensure that these. Stud to diaphragm wind load. These forces are different than diaphragm design forces.

Diaphragm selection for shear force roof and floor diaphragms example 2. Calculating diaphragm forces awc design aid 6 max shear at ends max moment at mid span. The term diaphragm is usually applied to roofs and floors. A shear wall however is a vertical cantilevered diaphragm.

Wood frame shear wall and diaphragm design ricky mclain ms pe se. Asce 7 10 outlines the procedure for calculating diaphragm design forces. 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. The corresponding diaphragm chord forces are therefore equal to m divided by the diaphragm depth b.

The forces described in the previous section are the forces seismic base shear puts on the frames walls. The maximum roof diaphragm moment m equals ww wl x l2 8. Wind load diaphragm sheathing floor roof framing perpendicular to walls floor joist.