Vibration Response of Brick Concrete Buliding under Shaft Blasting

Abstract

During the blasting construction, the problem of building vibration caused by blasting cannot be ignored. Therefore, this paper uses the measured blasting seismic wave of a shaft in Qingdao Metro as the input parameter to conduct numerical simulation to research the influence of blasting vibration of shaft on brick concrete bulidings. The results show that The Z-direction vibration velocity has obvious local amplification on the roof, and the amplification factor is 1.4-1.9 relative to the top floor. The magnification factor on the backward side is smaller than the magnification factor on the frontward side, and the elevation magnification effect gradually weakens as the elevation difference increases. HHT (Hilbert-Huang Transform) method is used to analyze blasting seismic wave signals, when the blasting seismic wave propagates from the first floor of the brick concrete buliding to the roof, the energy is reduced by about 67%-80%. The frequency band of 0-30 Hz is the main range of blasting energy distribution in brick concrete buildings, and attention should be paid to resonance phenomenon.