Isteg Steel For Concrete Reinforcement
D. B. Steinman
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Isteg steel reinforcement consists of two plain round bars twisted together cold with the length held constant. This cold-working operation raises the yield strength over 54 percent. Beams designed with lsteg steel at 50 percent higher stress and with a I5 percent increase in concrete stress have a higher factor of safety than beams designed with plain or deformed bars with the usually specified stresses. lsteg bars have over 23 percent higher bond strength than plain or deformed bars after reducing the lsteg bars by 33 percent in section for the recommended higher unit stress.