基于新《电力设施抗震设计规范》的地震动随机模型参数研究

Parametric Study on the Seismic Random Vibration Model Based on the New “Code for Seismic Design of Electrical Installations”

摘要:

根据新《电力设施抗震设计规范》（GB50260-2013）对随机地震动功率谱参数的取值进行分析。介绍新《电力设施抗震设计规范》中设计反应谱，推导设计谱到功率谱的转换过程。选取常用的Clough-Penzien修正过滤白噪声模型作为拟合函数，通过功率谱参数拟合，得到不同场地类别、不同抗震设防烈度下的地震动模型参数。该研究成果可为电力工程抗震设计分析提供参考。

Abstract:

The spectral parameters of a seismic random vibration model have been analyzed based on the Chinese standard code for seismic design of electrical installations (GB50260-2013). In this paper, the design response spectrum in the new code is introduced, and different regulations are made for the seismic effect coefficient curve of different site types. A non-stationary model is established for the process of non-stationary ground motion. The time envelope function is used to consider the non-stationary characteristics of the earthquake, and then the value of the ground motion duration is given. The absolute acceleration under the input of non-stationary vibrations is obtained using the research results of stationary vibrations. The transform process from design spectrum to power spectrum is derived, and the Clough-Penzien model is selected as the fitting function. Using the least square method, the parameters of the power spectrum model corresponding to the design spectrum in the new code are obtained. The fitting power spectrum curve agrees well with the calculated power spectrum curve, indicating that the Clough-Penzien acceleration spectrum can correspond well with the calculated power spectrum curve. By fitting the power spectrum parameters, the parameters of ground motion model under different earthquake intensities and site types are obtained. The research results can provide reference for seismic design analysis in power engineering.