131-584 Bending and Straightening of Grade 60 Reinforcing Bars


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Title: 131-584 Bending and Straightening of Grade 60 Reinforcing Bars

Author(s): J. P. Stecich, John M. Hanson and Paul F. Rice

Publication: Concrete International

Volume: 6

Issue: 8

Appears on pages(s): 14-23

Keywords: bending (reinforcing steels); bend tests; heating; reinforcing steels; research; temperature; ten-sile properties; yield point.

Date: 8/1/1984

Bending and straightening tests were conducted on Grade 60 reinforcing bars. Three sizes of billet steel bars were included in the tests; #5, #8, and # 11. The bars were obtained from three sources, one source supplying all three sizes and two only the # 11 bars. Tests were done at cold and room termperatures. Bars were bent to the minimum diameter specified in the American Concrete Institute’s Building Code Requirements for Reinforced Concrete (ACI 318-83) and to as small a diameter as possible. Bending was done around the weak and strong axis. Some bars were flame heated to approximately 1500 F (820 C) to reduce breakage. Tensile tests were conducted on straightened bars to compare with tensile tests of unbent con trol bars.