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。
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.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2007年第9期1372-1379,共8页
Chinese Journal of Geotechnical Engineering
基金
国家科技部社会公益研究专项(2005DIB2J122)
国家自然科学基金资助项目(50508041)
黑龙江省青年科学专项资金资助项目(QC05C21)
关键词
强震记录
液化
识别
双质点模型
频率下降率
strong ground motion record
liquefaction
detection
double-degree-freedom
frequency decrease rate
