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| Analysis on Variation Laws of Spectrum and Amplitude for Blasting Vibration Response of Reinforced Concrete Building |
CHEN Shi-hai;WEI Hai-xia;ZHANG Zi-hua; DU Rong-qiang
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| Shandong University of Science and Technology, Qingdao 266510, Shandong, China |
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Abstract To discuss characteristics of blasting vibration effects of reinforced concrete buildings, a large number of blasting vibration response signals of reinforced concrete building were monitored by locating measuring points on the multi-story reinforced concrete building along the height direction, which was under-drilled through in the course of blasting excavation of a tunnel. Distribution characteristics of spectrum and energy and amplitude variation laws of structural response of reinforced concrete building to the blasting seismic action along the height direction in all direction were studied with the method of wavelet analysis combined with FFT. The results indicate that the frequencies of velocity response signals of reinforced concrete buildings to blasting seismic waves are relatively large and the dominant frequency bands which occupy a large portion of total energy is wide which mainly focus on range of 15Hz~600Hz. The frequencies and amplitudes of velocity response signals of reinforced concrete buildings are individually lower and higher in vertical direction than in horizontal direction, and the ratio shows raising trend with the floor increasing. With the floor changing, characteristics of spectrum and amplitudes of structural response signals to the blasting seismic action in both vertical and horizontal direction change without obeying any laws.
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Received: 09 October 2009
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2011, Vol. 30 
