考虑增量时程贡献趋向和误差排序的多阻尼目标反应谱拟合

Generation of Multi-Damping-Response-Spectrum-Compatible Ground Motions Considering Contribution of Increment Time History and Error Sorting

在目前的多阻尼反应谱拟合的时程调整法中,由于各阻尼、各控制周期点之间的交叉影响,拟合误差容易出现"此消彼长"的现象,进而降低拟合精度和收敛速度。基于现有单阻尼反应谱拟合的时域调整方法,探讨了增量加速度时程引起的最大地震动反应的正负向及阻尼-周期调整顺序对拟合精度和收敛速度的影响,并提出了考虑增量加速度时程的最大反应贡献趋向和按误差排序的改进思路。将改进后的时域调整法应用于核电厂多阻尼目标反应谱拟合上,选取不同时-频特征的天然地震动时程作为"种子"进行拟合,探讨"种子"时程的选取对拟合结果的影响,并提出针对不同工程结构进行目标反应谱拟合时,应根据结构物的动力特性选取初始的"种子"时程。

Based on the existing time-domain adjustment method,the contribution of the maximum response of increment time history and the sequence of damping-period for adjustment are discussed. An improvement that consider the contribution trend of the maximum response of increment time history and the error sorting are presented. The improved time-domain adjustment method is then applied to the multi-damping target response spectrum fitting for nuclear power plants. Five ground motion records with different temporal and spectral characteristics are selected as seed to investigate the influence of seed selection on generated ground motions. It is suggested that the selection of seed record should consider the dynamic characteristics of the structure to be analyzed.