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| 基于现场记录的液化和非液化场地加速度时频曲线对比分析 | |
| 引用本文： | 孙锐,袁晓铭,陈龙伟,曹振中,李雨润.基于现场记录的液化和非液化场地加速度时频曲线对比分析[J].岩土力学,2010,31(10):3130-3138. |
| 作者姓名： | 孙锐 袁晓铭 陈龙伟 曹振中 李雨润 |
| 作者单位： | 1. 中国地震局工程力学研究所,哈尔滨,150080;哈尔滨工程大学,船舶工程学院,哈尔滨,150001 2. 中国地震局工程力学研究所,哈尔滨,150080 3. 河北工业大学,土木工程学院,天津,300401 |
| 基金项目： | 国家自然科学基金，国家科技支撑计划，国家重点基础研究发展计划，哈尔滨市人才专项资金项目，河北省教育厅科研项目 |
| 摘 要： | 研究液化场地和非液化场地上地表地震加速度记录的时频曲线,提出频率下降率概念和计算方法,给出液化场地和非液化场地频率下降率的分界值。加速度时频曲线采用零交法进行分析,非液化场地包含软土场地和除去软土场地后的一般非液化场地。结果表明:①所定义的频率下降率的概念和计算方法,能够反映液化和非液化场地地表加速度时频响应特征和变化规律;②峰值前,在平均意义上液化场地与一般非液化场地平均频率相差不大,软土场地上的平均频率远小于一般非液化场地和液化场地;③峰值后,在平均意义上一般非液化场地加速度平均频率最高,软土场地居中,液化场地最低;④软土场地与液化场地峰值后平均频率范围有交叉,如以加速度时频曲线绝对变化量为判断标准,软土场地和液化场地会出现混淆;⑤液化场地和非液化场地的加速度频率下降率的分界值为0.5,以此可正确区分出液化场地与非液化场地以及液化场地与软土场地。 |
| 关 键 词： | 液化场地 非液化场地 软土场地 地震动 时频曲线 |
| 收稿时间： | 2009-02-16 |
Comparative analysis of time-frequency curves of acceleration records on liquefaction and non-liquefaction sites |
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| SUN Rui,YUAN Xiao-ming,CHEN Long-wei,CAO Zhen-zhong,LI Yu-run.Comparative analysis of time-frequency curves of acceleration records on liquefaction and non-liquefaction sites[J].Rock and Soil Mechanics,2010,31(10):3130-3138. | |
| Authors: | SUN Rui YUAN Xiao-ming CHEN Long-wei CAO Zhen-zhong LI Yu-run |
| Institution: | 1. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China; 2. College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China; 3. College of Civil Engineering, Hebei University of Technology, Tianjin 300401, China |
| Abstract: | The time-frequency histories of acceleration records on liquefied and non-liquefied sites are analyzed. The concept and the calculation method of frequency decreasing ratio are proposed; and the division between the liquefied and non-liquefied sites is presented. The zero-crossing method is employed to analyze the time-frequency curves of acceleration records. The non-liquefied sites include the soft sites and the ordinary non-liquefied sites. The results indicate: ① The concept and calculation method of frequency decreasing ratio proposed in this paper can describe the characteristics and regulations of time-frequency on liquefied and non-liquefied sites. ② Before PGA, the difference of the average frequencies of acceleration on liquefied and non-liquefied sites is not obvious; and the average frequency of acceleration on soft sites is smaller than that either on liquefied or non-liquefied sites. ③ After PGA, the average frequency of acceleration on ordinary non-liquefied sites is the highest of the three types of sites, that of soft sites is the middle and that of liquefied sites is the smallest. ④ If the absolute change of the time-frequency is used as the criteria, it will be confused between soft sites and liquefied sites. ⑤ The threshold of frequency decreasing ratio is 0.5 between liquefied and non-liquefied sites, which can distinguish the liquefied sites, non-liquefied sites and soft sites correctly. |
| Keywords: | liquefied site non-liquefied site soft site ground motion time-frequency curve |
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