| 基于强震记录快速识别场地液化的频率下降率法 |
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| 引用本文： | 孙锐,袁晓铭.基于强震记录快速识别场地液化的频率下降率法[J].岩土工程学报,2007,29(9):1372-1379. |
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| 作者姓名： | 孙锐 袁晓铭 |
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| 作者单位： | 中国地震局工程力学研究所；中国地震局工程力学研究所 黑龙江哈尔滨150080；黑龙江哈尔滨150080； |
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| 基金项目： | 科技部社会公益研究项目;国家自然科学基金;黑龙江省青年科学专项资金资助项目 |
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| 摘 要： | 提出了一个以频率下降率为基本指标的依据强震记录快速识别场地液化的新方法。将可液化场地简化为双质点模型,给出了液化导致场地水平自振频率下降的计算公式,推导出了频率下降率的下限值。以此为基础建立了一套基于强震记录快速识别场地液化的方法,并用实际地震记录对其可靠性进行了分析。结果表明:应用本文提出的方法,不仅成功地识别了液化场地和非液化硬土场地,也成功地识别了软土但非液化的场地。
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| 关 键 词： | 强震记录 液化 识别 双质点模型 频率下降率 |
| 文章编号： | 1000-4548（2007）09-1372-08 |
| 修稿时间： | 2006-07-26 |
The method of frequency decrease rate for fast identification of site liquefaction from surface acceleration records |
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| SUN Rui,YUAN Xiao-ming.The method of frequency decrease rate for fast identification of site liquefaction from surface acceleration records[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1372-1379. |
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| Authors: | SUN Rui YUAN Xiao-ming |
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| Affiliation: | Institution of Engineering Mechanics CEA Harbin 150080 China |
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| Abstract: | A new method based on the frequency decrease rate for fast identification of site liquefaction from surface acceleration records was presented.The liquefiable site was simplified as a double-degree-freedom model and the formula for calculating the reduction of horizontal natural frequency induced by liquefaction was attained.And then the lower limit of the frequency decrease rate was derived,and the fast identification method of site liquefaction from surface acceleration records was proposed.The reliability of the method was examined with the actual earthquake records and it indicated that by using the present approach not only the liquefied sites and the stiff non-liquefied sites were identified,but also the soft non-liquefied sites were detected. |
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| Keywords: | strong ground motion record liquefaction detection double-degree-freedom frequency decrease rate |
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