Abstract
AbstractAn evaluation of concrete reinforcing bar fatigue provisions of AASHTO LRFD Bridge Design Specifications as they pertain to the use of high-strength reinforcing steel is presented. Two large-scale proof tests and a review of available published data demonstrate that presently accepted values for the fatigue or endurance limit for reinforcing steel are applicable, and likely conservative, when applied to higher-strength bars. A minor revision to the AASHTO specification is proposed to eliminate the fatigue penalty resulting from the use of higher-strength reinforcing steel. Finally, it is shown that fatigue considerations will rarely affect the design of typical reinforced-concrete members having a specified yield strength, fy≤690 MPa.
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