Analysis on Attenuation-amplification Effect and Vibration Monitoring of Pier-beam of Continuous Beam Bridge under Near Blasting

摘要

Vibration of continuous beam bridge is caused by explosion seismic wave in influence area. In order to provide scientific basis for seismic design and security assessment for continuous beam bridge, three-direction attenuation-amplification effect of vibration of pier-beam was analyzed. Based on blast monitoring project of South Branch Approach Bridge of Xiazhang Sea-Crossing Bridge under construction, the attenuation-amplification effect of peak vibration velocity from the bottom of the pier to the top of the box girder in the different stages were analyzed. The average attenuation-amplification coefficients of peak vibration velocity in three-direction and the one synthesized by three vectors are concluded.