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Blasting vibration response of full-scale single column bridge model(PDF)


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Blasting vibration response of full-scale single column bridge model
WANG Guo-bo HU Jun JI Shan XIE Wei-ping WANG Li
1. Key Laboratory of Hubei Province for Road, Bridge and Structure Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China; 2. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China
bridge engineering full-scale model test blasting vibration response dynamic finite element
To research the vibration transmission law and its effect on surroundings induced by viaduct pier blasting, the field test and numerical analysis were combined to carry out relative research. Firstly, representative piers were selected on the surface of soil without concrete, which were poured at the test site according to the same size and reinforcement. And two independent pier column models were built to carry out single column blasting tests and field measurements. Then, numerical calculation models were established through LS-DYNA software and the detailed fitting analysis of the blasting test were conducted to obtain vibration velocity curves and their spectrum of each measuring point. Blasting effect was analyzed from two aspects, vibration amplitude and spectral characteristic. Finally, the results were compared with the test data. The results show that the velocity response of each direction decreases gradually with the increase of distance between measuring point and blast source. The vertical velocity decays fastest, and velocity at each point is between 0.05 to 1.36 cm/s, among which the vertical velocity is the largest and the horizontal tangent is the smallest. The vibration frequency at each point in each direction ranges from 15 to 20 Hz, has relatively large difference to the fundamental frequency of general buildings in surrounding area. Blasting vibration decreases very quickly in air, which indicates that the vibration effect caused by blasting is less affected. The numerical fitting analysis results are basically consistent with the dynamic response of the test results, which verifies that the dynamic finite element method employed in this paper can better simulate the test process, and can be used for preliminary analysis on the whole blasting process of viaduct, so as to provide reasonable basis for blasting scheme.



Last Update: 2017-07-17