258 STEEL REINFORCEMENT 



PROPERTIES OF TWISTED LUG BARS 



bar, named after its inventor, A. L. Johnson. The old style 

 of bar is shown in (e), and the new style in (f). High-carbon 

 steel having an elastic limit of from 65,000 to 70,000 Ib. per 

 sq. in. is used in making the Johnson bar. This type of bar 

 was one of the first deformed bars to be manufactured. The 

 following table gives the size, net section, and weight of 

 Johnson bars : 



SIZE, NET SECTION, AND WEIGHT OF CORRUGATED, 

 OR JOHNSON, BARS 



Universal Bar. In Fig. 2 (g) is shown a type of flat 

 deformed bar, called the Universal bar, that has been used 

 to some extent for reinforcement. The net section and 

 weight of the various sizes of the Universal bar are given 

 in the following table. 



