Roof Deck Deflection

A metal roof deck diaphragm is a fairly flexible system somewhat analogous to a truss as shown in figure 2. Specifically roof decks subjected to gravity loading dead live or snow and wind uplift loading can be analyzed using either asd or lrfd methods. The amount of flex depends on the magnitude of the load applied span of the member and stiffness of the member.

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Bending stresses as well as deflections are checked.

Roof deck deflection.

The insurance fire rating or wind uplift requirements of a building may not allow a substitutionof fasteners or change inspacingasgoverned by design. Allowable deflection is generally expressed as a fraction of the span in inches. Deflection is the bending or sag caused by loading. All spans are to be considered center to center of supports.

First to the west coast market our new smooth series rivet attachment offers a. Deflection of the deck shall not exceed l 240 under the uniformly distributed design live load. Designer should check the deflection of the diaphragm. Roofdeck is a spreadsheet program written in ms excel for the purpose of analysis and design of roofs with steel deck.

Standard structural decking patterns are 2 nominal tongued and grooved t g and 3 and 4 double t g products available with vee or eased edges to meet discriminating architectural requirements. Structural decking also known as roof decking should not be confused with lumber intended for residential and non residential outdoor decks. 2 deep roof deck and has since replaced the previous industry standard 36 5 and 36 7 attachment patterns. Commentary the adequacy of deck edge support details should be revised.

All structural members will deflect or flex under load. Other innovations include n 32 a 32 wide 3 deep roof deck panel and our new smooth series rivet attachment for our portfolio of cellular deck products.

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