Steel Roof Diaphragm Design

Steel roof and floor deck diaphragm design requires careful attention to load paths stiffness variations fastener types and regional preferences figure 1.

Steel roof diaphragm design.

The maximum average shear r b occurs at the ends of the roof diaphragm. It includes information for the design of steel deck diaphragms for roof and floor decks and complies with the requirements of the ansi aisi s310 2013 north american standard for the design of profiled steel diaphragm panels. 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. Results are output in a convenient downloadable pdf.

September 2015 the fourth edition of the sdi diaphragm design manual ddm04 replaces the third edition ddm03. Steel roof and floor deck diaphragm design requires careful attention to load paths stiffness variations fastener types and regional preferences figure 1. Metal deck or composite metal deck in steel construction. In its most basic form a diaphragm behaves as if it were a short deep beam.

Simply input your project data and our tool will customize your load tables or diaphragm designs from among more than 73 000 permutations. Zones near the mid span of the roof are subjected to less unit shear therefore less diaphragm strength is required. 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 hilti profis df diaphragm software version 2 0 1 calculates diaphragm shear flexibility factors and uplift resistance for steel deck roof and floor systems.

Diaphragms are usually constructed of plywood or oriented strand board in timber construction. Our new interactive deck tools provide the fastest way to generate your load tables and diaphragm designs for roof composite and form deck. The program is based on the steel deck institute sdi diaphragm design method and incorporates the latest icc es ac43 performance data. Generally there are two different types of diaphragms.

Roof deck historically published diaphragm design tables for roof deck have been based on diaphragm shear loads only. In its most basic form a diaphragm behaves as if it were a short deep beam. 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.