Steel bar fracture of reinforced concrete (RC) column under strong cyclic load hasbeen tested. On the basis of the test results, the steel bar fracture of specimen is consideredas the very low cycle fatigue behavior and the calculation method of steel bar fractureis derived by the use of Coffin-Manson equation and the Palmgren-Miner rule.The obtained damage ratio equation of steel bar fracture can be easily applied to theseismic response damage analysis of multi-story RC frame under extremely strongground motion. By the use of the derived damage analysis method, the effects of designconditions on the seismic response damage of RC frame are investigated.
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