首页|武汉某超高层建筑对台湾花莲6.9级地震的结构响应分析

武汉某超高层建筑对台湾花莲6.9级地震的结构响应分析

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为研究2022年台湾花莲6.9级地震对武汉市某超高层建筑结构的影响,初步分析了该建筑结构4个加速度测点记录的各向PGA放大效应、傅立叶谱及反应谱,分别利用互功率谱法和基于协方差的随机子空间法分别识别结构在频域和时域上的一阶模态.结果表明:结构的峰值加速度随楼层的增高而有显著的放大效应,最大放大倍数达7.322倍;各向傅立叶谱峰值均集中在0.275 Hz和1.171 Hz;加速度响应反应谱远小于该地区Ⅵ度设防地震设计谱;两种方法识别的结构一阶模态频率基本一致,均接近数值分析值.台湾花莲6.9级地震没有对该高层建筑结构造成损伤.
Analysis of the Structural Response of a Super High-rise Building in Wuhan to the Hualian,Taiwan MS6.9 Earthquake
Wuhan city is located at the junction of the Jianghan Fault Depression and the Southeastern Hubei Fold Belt,which is often affected by far-field earthquakes.At 14:00 on September 18,2022,a 6.9-magnitude earth-quake occurred in Hualian County,Taiwan Province of China.The structural dynamic response of a super high-rise building to the Hualian earthquake was completely recorded at 4 monitoring points in this building in Wuhan,more than 1000 km away from the epicenter.In order to study the impact of the earthquake on the building struc-ture,the anisotropic PGA amplification effect,the Fourier spectrum and the response spectrum are analyzed.The mutual power spectrum method and the stochastic subspace identification method based on covariance are used re-spectively to identify the first-order modes of the structure in the frequency domain and the time domain.The re-sults show that the peak acceleration of the structure has a significant amplification effect with the increase of the height of the floor,and the maximum amplification factor is 7.322.The peak value of the Fourier spectrum is con-centrated at 0.275 Hz and 1.171 Hz.The response spectrum of acceleration response is much smaller than the de-sign spectrum of the Ⅵ-degree fortification earthquake in this area.The frequencies of the first-order modes identi-fied by the two methods are generally the same,and are close to the values of numerical simulation.It is believed that the Hualian,Taiwan MS6.9 earthquake did not cause damage to the structure of the case building.

the Hualian,Taiwan earthquakemodal frequency identificationthe mutual power spectrum methodthe stochastic sub-space methodthe structural response observation array

罗渊、杨江、范涛

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中国地震局地震研究所,湖北武汉 430071

武汉地震科学仪器研究院有限公司,湖北武汉 430071

湖北省重大工程地震监测与预警处置工程技术研究中心,湖北咸宁 437000

台湾花莲地震 模态频率识别 互功率谱法 随机子空间法 结构响应观测台阵

中国地震局地震研究所和应急管理部国家自然灾害防治研究院基本科研业务费专项资助项目湖北省重点研发计划项目地震科技星火计划项目

IS2022163172022BAD059XH23027YB

2024

10.20015/j.cnki.ISSN1000-0666.2024.0042

地震研究
云南省地震局

地震研究

CSTPCD北大核心
影响因子：0.884
ISSN：1000-0666
年,卷(期)：2024.47(3)
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