| 液化场地强震记录的频谱特征 |
| |
| 引用本文： | 徐国林,陈龙伟.液化场地强震记录的频谱特征[J].地震学报,2019,41(5):671-679. |
| |
| 作者姓名： | 徐国林 陈龙伟 |
| |
| 作者单位： | 中国昆明 650224 西南林业大学土木工程学院;中国哈尔滨 150080 中国地震局工程力学研究所;中国哈尔滨 150080 中国地震局地震工程与工程振动重点实验室 |
| |
| 基金项目： | 国家自然科学基金项目（51768065） |
| |
| 摘 要： | 为研究液化场地上建筑物承受地震作用的特性，本文利用11组液化场地实测记录，对液化场地的地震动特征进行了分析。结果显示，场地液化后，地表加速度幅值减小，长周期成分显著增多，记录中出现明显的 “尖刺” 。对比国内外抗震规范设计反应谱与液化场地实测加速度反应谱，分析得出:在短周期T＜0.3 s，规范设计反应谱值与实测记录反应谱基本一致；在中长周期段0.3 s＜T＜1.5 s，规范反应谱值明显低于实测记录反应谱值；在长周期段T＞1.5 s，规范设计谱较实测记录反应谱值略低。基于5种数值方法模拟的液化场地地震动结果显示:周期T＜1.0 s时，数值计算的反应谱值基本高于液化场地实测反应谱值，或与之吻合；而周期T＞1.0 s时，数值计算的反应谱值均低于液化场地实测反应谱值。
|
| 关 键 词： | 液化场地 地震动记录 抗震规范 反应谱 |
| 收稿时间： | 2019-05-30 |
Frequency spectra characteristics of strong-motion acceleration recordings at liquefied sites |
| |
| Institution: | 1.Institute of Civil Engineering，Southwest Forestry University，Kunming 650224，China2.Institute of Engineering Mechanics，China Earthquake Administration，Harbin 150080，China3.Key Laboratory of Earthquake Engineering and Engineering Vibration，China Earthquake Administration，Harbin 150080，China |
| |
| Abstract: | To understand the characteristics of earthquake action on buildings at potentially lique-fiable sites, 11 acceleration records from the selected liquefied sites were analyzed to discuss the characteristics of ground motion. The results showed that the acceleration amplitudes were remarkably reduced after initial site liquefaction and that the long-period components increased significantly with apparent " spikes” recorded. Comparison of the design spectra widely used in seismic design codes, both domestically and internationally, with the acceleration spectra obtained in this study shows that: in the short period range T＜0.3 s, the design spectra were consistent with the recorded response spectra; in the medium and long period range 0.3 s＜T＜1.5 s, the design spectra were smaller significantly than the recorded response spectra; in the long period range T＞1.5 s, the design spectra was a little smaller than the recorded spectra. Five typical numerical methods are used to simulate liquefaction acceleration, the results demonstrated that the numerical methods could satisfactorily predict response spectral values for the period range T＜1.0 s, but generally lower than the spectral values for the long-period T＞1.0 s. |
| |
| Keywords: | |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《地震学报》浏览原始摘要信息 |
| 点击此处可从《地震学报》下载免费的PDF全文 |
