| 基于《电力设施抗震设计规范》的地震动随机模型参数研究 |
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| 引用本文： | 田利,李宏男.基于《电力设施抗震设计规范》的地震动随机模型参数研究[J].地震学刊,2010(1):17-22,82. |
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| 作者姓名： | 田利 李宏男 |
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| 作者单位： | 大连理工大学海岸与近海工程国家重点实验室,辽宁大连116023 |
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| 基金项目： | 国家自然科学基金重点项目（50638010）; 教育部创新团队项目（IRT0518）; 高等学校博士点基金项目（20060141027）资助 |
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| 摘 要： | 依据《电力设施抗震设计规范》（GB50260-96）中的设计反应谱,对随机地震动功率谱参数的取值进行了具体研究。首先,采用时间包络函数考虑地震的非平稳特性,给出了地震动持时的取值;然后,根据加速度峰值等效原则,迭代计算得到地面的加速度功率谱密度曲线;最后,选定Clough-Penzien修正过滤白噪声模型作为拟合函数,通过非线性拟合技术拟合了与《规范》中的地震烈度、场地类别相对应的谱参数。研究结果表明,Clough-Penzien修正过滤白噪声模型能较好地拟合其曲线形状。本文给出了相对于规范中的地面加速度功率谱参数值,可供这种模型作为地震地面运动输入时选用。
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| 关 键 词： | 地震动反应谱 地震动随机模型 功率谱密度函数 |
Parameter Study on Seismic Random Model Based on Code for Design of Seismic of Electrical Installations |
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| TIAN Li,LI Hong-nan.Parameter Study on Seismic Random Model Based on Code for Design of Seismic of Electrical Installations[J].Journal of Seismology,2010(1):17-22,82. |
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| Authors: | TIAN Li LI Hong-nan |
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| Institution: | (State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116023,China) |
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| Abstract: | The spectral parameters of a seismic random model have been studied on the basis of the design response spectrum in the Chinese standard Code for design of seismic of electrical Installations（GB50260-96）.First,the nonstationarity of the ground motion is represented with an envelope function,which defines the duration of the ground motion at same time.Then,the power spectral density（PSD） of the acce-leration at ground level is evaluated by an iterative approach according to the principle of equivalent peak acceleration.Finally,the Clough-Penzien acceleration spectrum is selected as a target function to calculate the PSD curve through nonlinear fitting on the parameters,such as earthquake intensity and site type,defined in the code.The results show that the Clough-Penzien spectrum can fit the PSD curve well.The spectrum parameters of the random model of ground motion are given in this paper,and they provide a re-ference for the selection of ground motion input. |
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| Keywords: | ground motion response spectra seismic random model power spectral density function |
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