Abstract
A literature review of the effects of high strain rates on the properties of steel reinforcing bars was conducted. Static and dynamic properties were gathered for bars satisfying ASTM A615, A15, A432, A431, and A706, with yield stresses ranging from 42 ksi (290 MPa) to 103 ksi (710 MPa). Strength enhancement with strain rate was expressed in the form of a dynamic increase factor (DIF) defined as the ratio of the dynamic to static yield (or ultimate) stress. It was observed that the DIF would increase for lower reinforcing bar yield stress. A simple relationship is proposed that gives the DIF (for both yield and ultimate stress) as a function of strain rate and yield stress. This relationship is of importance for the analysis of reinforced concrete structures subjected to blast or highly dynamic loads.
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