Composite slab and joist assembly and method of manufacture thereof

A joist comprising:

• a bottom chord,
• a top chord, and
• a web affixed therebetween,
• wherein said top chord has a first elongated structural angle and a second elongated structural angle, said first structural angle having in cross-section a horizontally-extending leg and an upwardly-extending leg meeting at a corner, said second structural angle having in cross-section a horizontally-extending leg and a downwardly-extending leg meeting at a corner,
• wherein an upper portion of said web is joined to said top chord second structural angle against said downwardly-extending leg, and said first structural angle is joined to said second structural angle,
• a shoe attached to a longitudinal end of said top chord,
• wherein said shoe has a T-shaped cross-section, and wherein said top chord second structural angle, at said longitudinal end of said top chord, is coped to allow said shoe to be attached to and first and second structural angles to be flush with a longitudinal end of said first structural angle.

A joist comprising:

• a bottom chord,
• a top chord, and
• a web affixed therebetween,
• wherein said top chord has a first elongated structural angle and a second elongated structural angle, said first structural angle having in cross-section a horizontally-extending leg and an upwardly-extending leg meeting at a corner, said second structural angle having in cross-section a horizontally-extending leg and a downwardly-extending leg meeting at a corner,
• wherein an upper portion of said web is joined to said top chord second structural angle said downwardly-extending leg, and said first structural angle is joined to said second structural angle,
• wherein said upwardly-extending leg of said first structural angle has a series of transverse protrusions and indentations, whereby a protrusion on one side of said upwardly-extending leg has a corresponding indentation located transversely on the opposite side of said upwardly-extending leg, and said protrusion and corresponding indentation are each located at the same longitudinal position along the length of said top chord.

A joist comprising:

• a bottom chord,
• a top chord, and
• a web affixed therebetween,
• wherein said top chord has a first elongated structural angle and a second elongated structural angle, said first structural angle having in cross-section a horizontally-extending leg and an upwardly-extending leg meeting at a corner, said second structural angle having in cross-section a horizontally-extending leg and a downwardly-extending leg meeting at a corner,
• wherein an upper portion of said web is joined to said top chord second structural angle against said downwardly-extending leg, and said first structural angle is joined to said second structural angle,
• at least one splice in one of said structural angles of said top chord,
• further comprising:
• at least two splices, said first structural angle having one of said splices and said second structural angle having another of said splices,
• wherein said at least two splices are longitudinally offset along the length of said top chord.

In steel and concrete structures having at least one pair of spaced-apart parallel joists, each of which includes at least a top chord, and wherein a wooden form is normally mounted between the respective top chords of the pair of joists for subsequently pouring a concrete slab therebetween, the wooden form subsequently being removed once the concrete has cured, the improvement wherein the top chord of each joist comprises two complementary structural angles including first and second structural angles secured to each other, the first structural angle having an upwardly-extending leg and a horizontally-extending leg forming a first corner therebetween, the second structural angle having a downwardly-extending leg and further having a horizontally-extending leg forming a second corner therebetween the horizontally-extending leg of the second structural angle extending in a direction oppositely of the horizontally-extending leg of the first structural angle, the first and second angle members being disposed such that their respective corners substantially engage or confront one another, thereby forming in cross-section a substantially “plus” symbol, a panel permanently mounted horizontally between the pair of joists, thereby providing a concrete form, and concrete poured over the panel to form a slab, thereby eliminating the necessity of constructing, and subsequently removing, the wooden form between the pair of joists.