Steel Roof Diaphragm Design

Our new interactive deck tools provide the fastest way to generate your load tables and diaphragm designs for roof composite and form deck.

Steel roof diaphragm design.

Roof deck historically published diaphragm design tables for roof deck have been based on diaphragm shear loads only. September 2015 the fourth edition of the sdi diaphragm design manual ddm04 replaces the third edition ddm03. In its most basic form a diaphragm behaves as if it were a short deep beam. The larger design shears may be resisted by using both heavier gage panels and fewer.

Just as the floor or roof is checked for vertical load capacity it is considered a diaphragm in the plane of the floor and check for shear when designing the lateral force resisting system. Results are output in a convenient downloadable pdf. The maximum average shear r b occurs at the ends of the roof diaphragm. Zones near the mid span of the roof are subjected to less unit shear therefore less diaphragm strength is required.

Metal deck or composite metal deck in steel construction. Diaphragms are usually constructed of plywood or oriented strand board in timber construction. Steel roof and floor deck diaphragm design requires careful attention to load paths stiffness variations fastener types and regional preferences figure 1. Steel roof and floor deck diaphragm design requires careful attention to load paths stiffness variations fastener types and regional preferences figure 1.

Diaphragm design diaphragm design information for vulcraft roof and floor decks is based on the steel deck institute diaphragm design manual third edition ddm03 in accordance with the 2015 ibc. The diaphragm of a structure often does double duty as the floor system or roof system in a building or the deck of a bridge which simultaneously supports gravity loads. Vulcraft roof deck design tools 2018 ibc deck diaphragm calculate your unfilled deck diaphragm shear and stiffness for your exact condition based on the american iron and steel institute aisi s310 16. Simply input your project data and our tool will customize your load tables or diaphragm designs from among more than 73 000 permutations.

Generally there are two different types of diaphragms. Or a concrete slab in. The hilti profis df diaphragm software version 2 0 1 calculates diaphragm shear flexibility factors and uplift resistance for steel deck roof and floor systems.