Structural Health Monitoring of a High-Rise Building Using Ambient Noise Recordings and a Regional Earthquake Record

Linpeng Qin, Yun Wang, Zhen Guo, Yi Zhang, Chunqi Liao, Chang Chen, Baojian Zhang
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Abstract

Resonance frequency and seismic-wave velocity monitoring are both important for structural health monitoring (SHM). However, the limited number of vibration sensors or seismometers in most buildings necessitates the study of the sensitivity of monitoring indicators to ensure effective monitoring while reducing data acquisition costs and processing time. This study compares the changes in resonance frequency and seismic-wave velocity under ambient noise and a regional seismic event. Resonance frequency is calculated by power spectral density, whereas seismic-wave velocity is estimated using impulse response function and moving-window cross-spectrum methods. The results indicate that relative resonance frequency changes are more suitable for overall SHM due to its higher sensitivity and lower instrument requirements. Moreover, the time–frequency analysis method provides higher resolution results in resonance frequency during seismic events, a precision that seismic velocity methods cannot achieve.
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利用环境噪声记录和区域地震记录监测高层建筑的结构健康状况
共振频率和地震波速度监测对于结构健康监测(SHM)都很重要。然而,由于大多数建筑物中的振动传感器或地震仪数量有限,因此有必要对监测指标的灵敏度进行研究,以确保在降低数据采集成本和处理时间的同时进行有效监测。本研究比较了环境噪声和区域地震事件下共振频率和地震波速度的变化。共振频率用功率谱密度计算,地震波速度则用脉冲响应函数和移动窗交叉谱方法估算。结果表明,相对共振频率变化更适用于整体 SHM,因为其灵敏度更高,对仪器要求更低。此外,时频分析方法可提供地震事件期间共振频率的更高分辨率结果,这是地震波速度方法无法达到的精度。
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