Roof Diaphragm Deflection

13 5 l x 16 9 x l 13 5 18 ft 16 9 6 ft 24 14 4 psf.

Roof diaphragm deflection. Calculate the lateral load on the roof diaphragm. What is the total diaphragm deflection. The sdpws three term deflection equations are an algebraic simplification of the four term equations in the ibc. The corresponding diaphragm chord forces are therefore equal to m divided by the diaphragm depth b.

The term diaphragm is usually applied to roofs and floors. Asce 7 16 figure 12 3 1. Applies to both floor and roof diaphragms. W 612 plf.

A diaphragm is a flat structural unit acting like a deep thin beam. The maximum roof diaphragm moment m equals ww wl x l2 8. 1 1 2 x 18 ga deck vercor. R 1 3 diaphragm span.

A shear wall however is a vertical cantilevered diaphragm. L 42 diaphragm depth. To analyze the deflection of diaphragms bending shear and slip must be accounted for. 9 0 purlin spacing w14x26 af 2 1 sqin 7 welds per sheet vsc 12.

A diaphragm structure results when a series of such vertical and horizontal diaphragms are properly tied together to form a structural unit. There will also be slip. There will also be slip. I could use some help on a calculation done for flexible diaphragm deflection.

D 56 uniform load. However sdpws provides an option to calculate deflections using other methods such as the four term equations. Also because the diaphragm beam is deep relative to its span it will also have shear deflection. How is diaphragm flexibility defined for open front cantilever diaphragms vs.

The maximum unit shear on the wall diaphragm is also equal to the roof reaction r divided by b. Deflection of unblocked diaphragms is 2 5 times the deflection of blocked 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. The deck will have deflection similar to typical beam deflection.

Do shear walls located along diaphragm chord lines affect the diaphragm. This is based on limited testing of the diaphragm by apa. 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. What is the deflection equation for open front cantilever diaphragms.

The roof diaphragm will take load from half the wall below and load directly applied to the diaphragm. Diaphragms and shear walls.