A MODIFIED PARK-ANG SEISMIC DAMAGE MODEL CONSIDERING THE LOAD PATH EFFECTS
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摘要: 合理准确地评价结构和构件在地震作用下的损伤程度是地震工程研究领域中的重要课题。Park-Ang损伤模型具有良好的试验基础,近似考虑了首次超越和塑性累积损伤综合作用的破坏机理,在地震工程研究领域应用广泛。该文针对Park-Ang损伤模型不能考虑加载路径的影响、单调加载时损伤指标大于1等问题,根据低周疲劳理论和Miner准则,结合国内外相关试验结果,提出了能考虑加载路径影响的改进模型。利用Kunnath完成的尺寸和配筋构造完全相同仅加载路径不同的系列试验的结果对改进模型进行了验证。结果表明,改进模型能比较准确地评价加载位移幅值较小时试件产生的低周疲劳损伤破坏,且对于不同的加载路径,改进模型减小了构件破坏时损伤指标的离散性,提高了损伤评估的准确性。Abstract: Reasonably evaluating the damage of structures and components under earthquake action is an important subject in earthquake engineering research field. Because of the good experimental foundation as well as approximately considering the comprehensive function of first passage and cumulative damage effect, the Park-Ang seismic damage model has been widely used since it was proposed. However, it cannot consider the load path effects and the damage index will become greater than unity under monotonic loading. After analyzing the experimental results published previously, a modified model is proposed based on low-cycle fatigue theory and Miner’s rule. Then the modified model is verified by the experimental results of Kunnath. The results show that the modified model can accurately evaluate the low-cycle fatigue damage under small displacement loading. Furthermore, it also can improve the accuracy of damage evaluation, as it reduced the coefficient of variation of the damage index when the failure is caused by different load paths.
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Keywords:
- reinforced concrete /
- seismic damage model /
- damage index /
- hysteretic energy /
- low-cycle fatigue /
- load path
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