拟合核电厂多维设计反应谱及相关峰值的地震动调整方法

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (18) : 173-178.

论文

拟合核电厂多维设计反应谱及相关峰值的地震动调整方法

盛涛1 施卫星1 谢异同2 袁俊3

作者信息 +

A modifying method of earthquake ground motion for matching multi-dimensional nuclear power plants design response spectra and peak values

SHENG Tao1 SHI Wei-xing1 XIE Yi-tong2 YUAN Jun3

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文章历史 +

摘要

依据核电厂结构的特殊性，提出了一种以核电厂多维设计用伪加速度反应谱及峰值加速度(PGA)、峰值速度(PGV)、峰值位移(PGD)为目标的实际地震动调整方法。该方法首先应用二阶基数B－样条小波函数模拟实际多维地震动场，然后基于离散小波变换的快速算法，将实际地震动加速度时程应用二阶基数B－样条小波函数进行分解；一方面探寻对各向分量的PGA、PGV及PGD影响最大的小波分量，另一方面通过对小波系数进行初步调整以改进时域叠加小波函数的收敛性；最后通过循环调整实现对多维目标反应谱及PGA、PGV、PGD的同时拟合。选取了四组代表不同设计地震分组的三维实际地震记录分析了该方法的可行性，结果表明该方法不仅较好的保留了原地震动的局部时频特性，且能满足核电厂抗震设计规范的精度要求。

Abstract

According to the specificity of nuclear power plant structures, a modifying method of earthquake ground motion was proposed for matching multi-dimensional nuclear power plants design response spectra and peak values of ground acceleration (PGA), ground velocity (PGV) and ground displacement (PGD). First, the second cardinal B- spline wavelet was used to simulate multi-dimensional earthquake ground motion. Then real earthquake records were decomposed into several wavelet components by the fast algorithms of discrete wavelet transform. On the one hand, the wavelet components which affect the PGA, PGV and PGD of each direction can be searched out; on the other hand, the convergence quality of the syntheses wavelet method can be improved by the preliminary modification of wavelet coefficients. By iterations, the multi-dimensional target response spectra and PGA, PGV and PGD can be matched simultaneously. Four groups of three-dimensional real records which represent different earthquake groups were used to verify the feasibility of the modifying method. The results of the numerical examples demonstrate that the algorithms not only retain the time-frequency temporal features of the real earthquake records, but also satisfy the precision demand of codes for seismic design of nuclear power plants.

导出引用

盛涛施卫星谢异同袁俊. 拟合核电厂多维设计反应谱及相关峰值的地震动调整方法[J]. 振动与冲击, 2012, 31(18): 173-178

SHENG Tao SHI Wei-xing XIE Yi-tong YUAN Jun. A modifying method of earthquake ground motion for matching multi-dimensional nuclear power plants design response spectra and peak values[J]. Journal of Vibration and Shock, 2012, 31(18): 173-178