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Park-Ang双参数地震损伤模型考虑了地震作用的首次超越破坏与累积损伤破坏两方面因素,较好的定义了结构的破坏,被后续研究广泛应用,但无法区分不同幅值作用下结构破坏的差异。分析了不同位移幅值下钢筋混凝土柱的破坏特点,研究了结构损伤与结构耗能之间的关系。试验表明弹性阶段(位移幅值小于一倍屈服位移)的试件几乎不发生破坏,造成钢筋混凝土柱破坏的能量集中在相持阶段和破坏阶段,定义非弹性阶段引起结构破坏的滞回耗能为导致结构破坏的有效耗能。基于有效耗能假设引入有效耗能因子e,提出了改进的Park-Ang双参数地震损伤模型。对建议模型进行了21组钢筋混凝土柱的试验数据验证,计算结果表明:有效耗能因子可以反映相同耗能下不同位移幅值引起的结构破坏差异,有效耗能因子e物理意义明确,改进后的双参数地震损伤模型计算精度高,离散性小,能够区分不同位移幅值下钢筋混凝土柱的破坏差异,较好地评估了RC结构的损伤性能。
The Park-Ang two-parameter seismic damage model considers both the first overshooting and the cumulative damage of the seismic action, which well defines the structural failure and is widely used in subsequent studies. However, the failure of the structural failure under different amplitudes can not be distinguished difference. The failure characteristics of reinforced concrete columns with different displacement amplitudes are analyzed, and the relationship between structural damage and structural energy dissipation is studied. Experiments show that the specimens in the elastic phase (displacement amplitude less than one time yield displacement) hardly destroy, and the energy of the failure of the reinforced concrete column is concentrated in the phase of stalemate and failure. The hysteresis energy consumption of the structural failure caused by the inelastic phase is defined as Effective energy consumption leading to structural damage. Based on the effective energy consumption assumption, the effective energy dissipation factor e is introduced and an improved Park-Ang two-parameter seismic damage model is proposed. The experimental data of 21 reinforced concrete columns in the proposed model are validated. The results show that the effective energy dissipation factor can reflect the structural failure caused by different displacement amplitudes under the same energy consumption. The effective physical energy factor e has a clear physical meaning. After the improvement The two-parameter seismic damage model has high calculation accuracy and small discretization, which can distinguish the damage difference of reinforced concrete columns with different displacement amplitudes and evaluate the damage performance of RC structures well.