Stress-strain response of A706 grade 80 reinforcing steel

Before ASTM A706 grade 80 rebar may be specified in the seismic design of structures, its mechanical properties must be well understood and calibrated on a statistical basis. Based on the results of 788 tensile tests of A706 grade 80 rebar encompassing bar sizes No. 4-No. 18 (approx. metric No. 13-No. 57), five major stress-strain parameters are statistically evaluated and used to develop recommendations for an expected monotonic stress-strain curve. An existing material model is shown to accurately capture the shape of the monotonic stress-strain curve. Additional tests are used to evaluate the strain-aging performance of the steel.