1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China 2. Beijing’s Key Laboratory of Structural Wind Engineering and Urban Wind Environment, Beijing Jiaotong University, Beijing 100044, China
Tests were conducted in a 13-storied residential building where obvious horizontal vibration often occurred. One-third octave spectra and weighted acceleration levels were computed from the measured floor acceleration time histories in order to assess the human comfort levels. Modal parameters of the building were identified by using the frequency domain decomposition method. The inspection of the vibration sources around the building showed that the working frequency of the stone sawing machines in the nearby factories was 1.5 Hz which was the same as the fundamental natural frequency of the building causing resonance responses. Influences of number of working machines on the vibration responses of the building were measured. Results showed that the floor acceleration exceeded the limit when four machines were working in the factory about 200 m away from the building. The measured resonance responses of another building about 500 m away from the factory decreased. Frequency converters were installed on the machines to reduce vibration of the building. Floor accelerations of the building were measured under working frequencies 1.33 Hz and 1.2 Hz of the machines, which were significantly reduced. Results show that excitation intensity, distance between excitation and structure, difference between frequencies of excitation and structure are the key factors influencing structural resonance responses under external excitation of single frequency component.
Pei LIU,Hai-xin ZHU,Wei-guo YANG,Nan-qi HUANGFU. Tests on resonance and vibration mitigation responses of high-rise building under machine excitations. Journal of ZheJiang University (Engineering Science), 2020, 54(1): 102-109.
Fig.12Acceleration time histories on 13th floor at three vibration frequencies of sawing machines
fm/Hz
PGA/（m·s?2）
VL/dB
RMSamax/（m·s?2）
1.50
0.019 9
78
8.0×10-3
1.33
0.003 9
56
5.8×10-4
1.20
0.001 5
49
2.2×10-4
Tab.5Comparison of structural responses at three vibration frequencies of sawing machines
Fig.13PSD spectra on 13th floor at three vibration frequencies of sawing machines
Fig.14PSD spectra of all measuring points in Building No.5
模态阶数
f/Hz
ζ/%
振型
1阶
1.46
1.60
短轴向1阶弯曲
2阶
1.88
0.21
长轴向1阶弯曲耦合一定的扭转
3阶
2.37
0.50
1阶扭转
Tab.6Identified modes of Building No.5
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