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通过试验研究了低周疲劳损伤对钢筋混凝土柱动力特性的影响；采用自由衰减法测试并分析了钢筋混凝土柱的刚度和阻尼随损伤发展的变化趋势；通过回归分析建立了与动刚度损伤相联系的阻尼比试验统计公式；根据损伤柱等效截面静刚度与动刚度之间的统计关系，进一步建立了阻尼比与静刚度损伤的试验统计公式。分析结果表明：钢筋混凝土柱的阻尼比随其刚度的降低而逐渐增大，动刚度损伤和静刚度损伤均能够反映阻尼比的变化趋势。“,”Influences of low-cycle fatigue damage on dynamic performance of reinforced concrete （RC） columns were studied by tests. Using free vibration method, variational tendencies of rigidity and damping of RC columns with damage development were tested and analyzed. A testing statistics formula for the damping ratio related with damage of dynamic rigidity was established. Furthermore, based on statistical relationship between static rigidity and dynamic rigidity of equivalent section for damage column, the testing statistics formula for the damping ratio and damage of static rigidity was proposed. The analysis results show that the damping ratios of RC columns gradually increase with its reduction of rigidity. The variational tendency of damping ratio can be reflected by damage of dynamic and static rigidity.