End support shoe for composite joist

Claim 2

In a steel joist for use in a composite steel and concrete floor structure having a horizontal extending top chord, with a vertical extending cross-section a bottom chord vertically spaced from the top chord, a zig-zag bar web having its apices welded to the top and bottom chords; the improvement comprising: an end support shoe including an angle upon which an end of the bar web and said top chord are welded, and means acting as a torsion bar between said shoe and top chord including a torsion bar directly welded to the bar web and to the angle from one end and extending therefrom along said top chord in an elongated S-shaped curve disposed in a horizontal plane with the other end opposite to the angle being welded to the top chord for strengthening said joist by said torsion bar limiting the horizontal flexing or twisting of said web and top chord.

Claim 3

The joist of claim 1 further including a second bar welded to the top chord and the angle.

Claim 4

The joist of claim 1, wherein the first bar is of a larger diameter than the bar web.

Claim 5

The joist of claim 2, wherein the second bar is of a smaller diameter than the bar web.

Claim 6

In a steel joist for use in a composite steel and concrete floor structure, the improvement comprising: a top chord having at least a portion which is substantially S-shaped in transverse cross section with the bottom part of the S-shaped portion being substantially flat, an end support right angle shoe including an upright portion and integral therewith a horizontal portion, the end of said S-shaped portion of said top chord being welded upright inside said shoe to said upright and horizontal portions thereof, joist web means secured to and depending from said top chord and including a bar having a horizontal portion which at least partially rests on the upper side of said flat part of S-shaped portion and is welded thereto and to the upright portion of said shoe, and means operating as a torsion bar between said shoe and top chord includiing a horizontally disposed torsion bar extending along the chord and having one end extending adjacent the said horizontal portion of said web means bar anD being directly welded thereto and to the upright and horizontal portions of said shoe, said torsion bar having its other end inwardly horizontally offset and welded to the reentrant part of said S shaped portion, which reentrant part includes said substantially flat part, for strengthening said joist by said torsion bar limiting the flexing or twisting of said joist.

Claim 7

In a steel joist for use in a composite steel and concrete floor structure, the improvement comprising: a top chord having at least a portion which is substantially S-shaped in transverse cross section with the bottom part of the S-shaped portion being substantially flat, an end support right angle shoe including an upright portion and integral therewith a horizontal portion, the end of said S-shaped portion of said top chord being welded upright inside said shoe to said upright and horizontal portions thereof, joist web means secured to and depending from said top chord and including a bar having a horizontal portion which at least partially rests on the upper side of said flat part of S-shaped portion and is welded thereto and to the upright portion of said shoe, and means operating as a torsion bar between said shoe and top chord includiing a horizontally disposed torsion bar extending along the chord and having one end extending adjacent the said horizontal portion of said web means bar anD being directly welded thereto and to the upright and horizontal portions of said shoe, said torsion bar having its other end inwardly horizontally offset and welded to the reentrant part of said S shaped portion, which reentrant part includes said substantially flat part, for strengthening said joist by said torsion bar limiting the flexing or twisting of said joist.

Claim 8

A joist as in claim 5 wherein said one and other ends of said torsion bar extend substantially straight and parallel to each other with the mid portion of the bar extending in an elongated S-shaped curve to effect said offset.

Claim 9

A joist as in claim 6 wherein said web bar is substantially smaller in diameter than said torsion bar or the mouth of said reentrant part of said S-shaped portion of said top chord.

Claim 10

A joist as in claim 6 wherein said web bar has a diameter substantially the width of the mouth of said reentrant part of said S-shaped portion of said top chord and said torsion bar is substantially larger in diameter than said web bar.

Claim 11

A joist as in claim 8 and further including a third bar welded to said horizontal portion of said end shoe and to said S-shaped top chord portion on the opposite side of the latter as said web and torsion bars for further strengthening the connection between the end shoe and top chord.