| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a deformed steel bar improved in displacement quantity in hoop working, a yield point, tensile strength and concrete sticking stress compared to the one having two ribs, and capable of making the vertical displacement quantity and the lateral displacement quantity in hoop working uniform and almost equal with each other. <P>SOLUTION: Knots crossing in the longitudinal direction are formed on a peripheral surface of a round bar at intervals in the longitudinal direction of the round bar, six ribs continued to the longitudinal direction of the round bar are formed, and the six ribs are formed for each 60° along the circumferential direction while having the center of a cross section of the round bar as the reference. <P>COPYRIGHT: (C)2013,JPO&INPIT |
