DEFORMED BAR FOR IMPROVING BOND STRENGTH

摘要

The present invention relates to a deformed bar for improving bond strength, which forms a plurality of first and second protrusions having different heights and being slanted at a certain angle, thereby significantly enhancing the bond strength on the whole length of the deformed bar and enhancing bond performance to concrete. The deformed bar for improving bond strength of the present invention comprises: a steel rod having a circular cross section; a plurality of first protrusions which protrude on the outer circumferential surface of the steel rod so as to be spaced apart from each other at certain intervals; and a plurality of second protrusions which protrude on the outer circumferential surface of the steel rod, are disposed between adjacent first protrusions, and have a lower height than the first protrusions. The first protrusions and second protrusions are formed to be slanted at a certain angle with respect to the longitudinal axis of the steel rod. The steel rod has, on both side surfaces thereof, ribs formed in the longitudinal direction. The first protrusions and the second protrusions are respectively formed at the upper portion and lower portion of the ribs, and one first protrusion and one second protrusion are positioned on the upper portion and the lower portion of the ribs on the same cross section, so that the whole length of the deformed bar has the same cross sectional area.