260 



STEEL REINFORCEMENT 



effort is made to eliminate all sharp corners. The Thacher 

 bar is rolled from medium steel and has an elastic limit of 

 about 35,000 Ib. The accompanying table gives the size, 

 weight, and ultimate tensile strength of the Thacher bar. 



SIZE, AREA, AND WEIGHT OF DIAMOND BARS 



Diamond Bar. One of the most recent forms of deformed 

 bars is the Diamond bar, which is shown in Fig. 2 (). This 

 bar is rolled with a cross-section of constant area. The 

 nominal size, area, and weight of Diamond bars are given 

 in the accompanying table. 



FIG. 3 



Kahn Trussed Bar. Fig. 3 shows two styles of a deformed 

 bar known as the Kahn trussed bar. In the old style of bar, 

 shown in (a), the prongs are opposite each other; in the new 

 style, shown in (&), they are staggered. The shapes of the bar 



