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

›› 2010, Vol. 31 ›› Issue (10): 3130-3138.

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

孙锐^{1, 2}，袁晓铭¹，陈龙伟¹，曹振中¹，李雨润³

1.中国地震局工程力学研究所，哈尔滨 150080；2.哈尔滨工程大学船舶工程学院，哈尔滨 150001；3.河北工业大学土木工程学院，天津 300401

收稿日期:2009-02-16 出版日期:2010-10-10 发布日期:2010-10-14
作者简介:孙锐，女，1972年生，博士，研究员，主要从事土动力学方面的研究。
基金资助:
国家自然科学基金（No. 90715017，50778165）；国家科技支撑计划（No. 2006BAC13B02）；国家重点基础研究发展计划（No. 2007CB714201）；哈尔滨市人才专项资金项目（No. 2007RFXYS065）；河北省教育厅科研项目（No. Z20090387）资助。

Comparative analysis of time-frequency curves of acceleration records on liquefaction and non-liquefaction sites

SUN Rui ^{1, 2}, YUAN Xiao-ming¹, CHEN Long-wei¹, CAO Zhen-zhong1, LI Yu-run³

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

Received:2009-02-16 Online:2010-10-10 Published:2010-10-14

摘要/Abstract

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

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.

Key words: liquefied site, non-liquefied site, soft site, ground motion, time-frequency curve

中图分类号:

TU 43

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]. , 2010, 31(10): 3130-3138.

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]. , 2010, 31(10): 3130-3138.

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