Low Cycle Fatigue Performance and Failure Analysis of Reinforcing Bar

다국어 초록 (Multilingual Abstract)

Low cycle fatigue (LCF) behaviour and associated failure mechanisms of a thermo-mechanically treated Fe 500D steel rebarhave been experimentally evaluated with a view to assess its performance under seismic condition. The total axial straincontrolledLCF tests have been performed at five different strain amplitudes (± 0.30 to ± 1.00%) at ambient temperature untilfailure maintaining a constant true strain rate of 1 × 10− 3 s− 1 and a fixed strain ratio of − 1. Fatigue data have been analysedfollowing both strain–life and plastic strain energy–life relationships; while, macro as well as micro features of the failedspecimens, have been critically examined. These are supplemented by microstructural characterizations in addition to tensileand hardness measurements. Significant reduction of yield strength is recorded under dynamic loading which is responsiblefor considerable cyclic softening of rebar till failure in all strain amplitudes indicating the deterioration of seismic resistanceproperty. Both strain–life and plastic strain energy–life relationships are found to accurately predict the cyclic plasticbehaviour of the selected rebar. A near Masing behaviour is established by three different analytical approaches. The fatiguecrack is always found to initiate at the transverse rib root and primarily propagates alongside the rim region.

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