Abstract: A corrugated metal decking having alternating crests and troughs and interconnecting therebetween a decking web that is characterized by improved stiffening means, in particular in the form of embossments or indentations. There are provided a plurality of linear indentations, each extending across the decking web between the crest and trough walls. These indentations include inner and outer formed indentations, formed symmetrically about the web center plane with the length of each indentation being in the range of 70%-90% of the web cross-dimension and with the indentations being closely spaced. This arrangement provides for superior web stiffening and also provides improved composite action for interlocking between the metal decking and the concrete.

Abstract: An electrical trench grommet member for coupling between a corrugated metal decking having alternating crests and troughs and an electrical trench adapted to extend transversely of the decking and troughs. The decking has a hole in a crest thereof through which electrical wiring extends and the electrical trench also has a hole in the bottom wall thereof, which is preferably rectangular and larger than the decking hole. The grommet member in accordance with the invention has a grommet piece adapted to interlock with the decking hole and of comparable size to the decking hole to engage therewith and also includes an overlay piece integral with the grommet piece and extending peripherally therefrom to cover the larger trench hole.

Abstract: A corrugated metal decking having alternating crests and troughs and a decking web disposed angularly out of the vertical, a plurality of linear indentations each extending across the decking web in a direction between the crest and trough walls, said indentations being disposed in a parallel array, the length of each indentation being less than the full width of the decking web but extending over a substantial major fraction of the web width, said indentations being provided in contiguous alternating inner and outer formed indentations substantially symmetrical about the web plane, the length of each indentation being in the range of 70% to 95% of the web width, said web being joined to the crest and trough walls by a radius bend, the indentation length being on the order of but less than the dimension a-2R, where a is the web width and R is the radius of the bend and said indentations do not extend into crest walls, trough walls or radius bends.

Abstract: The system is preferably for use in building construction where concrete floors can be poured in place. The components of the system comprise parallel arranged joists preferably each constructed from three pieces to form an I-beam joist, bracing channels extending orthogonally between adjacent joists and mated at their respective ends with the joists, means for securing and bracing channels in place relative to the joists, and corrugated metal decking extending in separate sections between adjacent joists and over the bracing channels. Concrete is poured over the metal decking and interlocks with the top end of each joist to form a structurally securely supported, poured-in-place concrete floor.