Roof Diaphragm Deflection

Asce 7 16 figure 12 3 1.

Roof diaphragm deflection.

The roof diaphragm will take load from half the wall below and load directly applied to the diaphragm. How is diaphragm flexibility defined for open front cantilever diaphragms vs. This is based on limited testing of the diaphragm by apa. The sdpws three term deflection equations are an algebraic simplification of the four term equations in the ibc.

L 42 diaphragm depth. The thoracic diaphragm or simply the diaphragm ancient greek. W 612 plf. The deck will have deflection similar to typical beam deflection.

The maximum roof diaphragm moment m equals ww wl x l2 8. 13 5 l x 16 9 x l 13 5 18 ft 16 9 6 ft 24 14 4 psf. A diaphragm structure results when a series of such vertical and horizontal diaphragms are properly tied together to form a structural unit. Do shear walls located along diaphragm chord lines affect the diaphragm.

If framing members are spaced more than 24 o c testing indicates further deflection increase of about 20 or 3 times the deflection of a comparable blocked diaphragm. There will also be slip. A shear wall however is a vertical cantilevered diaphragm. Partition is a sheet of internal skeletal muscle in humans and other mammals that extends across the bottom of the thoracic cavity the diaphragm separates the thoracic cavity containing the heart and lungs from the abdominal cavity and performs an important function in.

Deflection of unblocked diaphragms is 2 5 times the deflection of blocked diaphragm. The term diaphragm is usually applied to roofs and floors. What is the deflection equation for open front cantilever diaphragms. There will also be slip.

To analyze the deflection of diaphragms bending shear and slip must be accounted for. However sdpws provides an option to calculate deflections using other methods such as the four term equations. A diaphragm is a flat structural unit acting like a deep thin beam. The corresponding diaphragm chord forces are therefore equal to m divided by the diaphragm depth b.

What is the total diaphragm deflection. What are the available methods of distributing torsional forces into the diaphragm. Calculate the lateral load on the roof diaphragm. Diaphragms and shear walls.

The maximum unit shear on the wall diaphragm is also equal to the roof reaction r divided by b. 1 1 2 x 18 ga deck vercor. Applies to both floor and roof diaphragms. Sheathing materials and unblocked wood structural panel diaphragms.

I could use some help on a calculation done for flexible diaphragm deflection. Also because the diaphragm beam is deep relative to its span it will also have shear deflection.