 | Impact of acoustic perforations on the stiffness, flexural and shear strengths of steel roof deck diaphragms
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What is acoustic deck?
Acoustic deck is used to improve a building’s sound absorption properties. Several of Canam’s steel deck products (P-2436, P-2404, P-3606 and P-3615) can be fabricated with perforated web elements, which act to reduce noise reverberation. The deck flutes are filled with fiberglass insulation that is supplied with the steel deck and installed at the same time as the roofing components.
For more information on the acoustic properties of perforated steel deck, please consult Steel fact sheet 16 prepared by the Canadian Sheet Steel Building Institute (CSSBI).
Reduced flexural strength and stiffness
Recent studies show that the addition of multiple perforations to the vertical ribs of steel deck acts to reduce its overall flexural strength and also reduces stiffness in steel deck with a depth of 76 mm (3 in.).
For more information on the research project that generated this data, please consult Steel fact sheet 27 prepared by the CSSBI.
Research findings:
Acoustic Deck vs. Plain Deck
Deck type | Deck depth | Strength reduction (%) | Stiffness reduction (%) |
P-3615 | 38 mm (1.5 in.) | 5 | No reduction |
P-3606 | 38 mm (1.5 in.) | 5 | No reduction |
P-2404 | 76 mm (3 in.) | 10 | 5 |
P-2436 | 76 mm (3 in.) | 10 | 5 |
Reduced shear strength and stiffness of diaphragms
While a number of studies have been conducted on the subject, the CSSBI and the U.S. Steel Deck Institute (SDI) have yet to take a formal stance regarding the reduced shear and stiffness capacity of diaphragms in the presence of acoustic deck. The results of these studies have demonstrated a general reduction of approximately 3% on both the diaphragm capacity and stiffness.
The current practice is to utilize a 5% reduction in capacity and stiffness.
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