Engineering Characteristics of Ground Vibration Caused by Blasting Demolition of Urban Viaducts  

作　　者：Jinjun Hu Yongqiang Yang Yingjun Guan 

机构地区：[1]Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration

出　　处：《Journal of Harbin Institute of Technology(New Series)》2016年第6期17-25,共9页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the National Natural Science Foundation of China(Grant No.51578516 and 51238012);the Basic Research Foundation of Institute of Engineering Mechanics,CEA(Grant No.2011B02);973 Program(Grant No.2011CB013601);the Wuhan Blasting Company

摘　　要：Ground vibration accelerations caused by the collapse of blasting demolition of urban viaducts was recorded in ordered to analyze the engineering characteristics and effects on the surrounding buildings. Through the analysis of peak ground acceleration,peak frequency,duration and response spectra of the recorded vibrations in different acceleration arrays,some conclusions are drawn: the peak ground acceleration decreases with increasing distance, and the amplitude of vertical component is higher than that of the horizontal components,especially in near source region. The peak frequency of ground acceleration decreases with distance,and in near source region,it is larger than the natural frequency of the surrounding buildings,and thus it will not have much effect on the buildings. The duration of ground acceleration caused by collapse is longer than that caused by blasting itself. The vertical response spectrum is the largest of the three components,and it decreases rapidly in the near source region of about 30 m,but beyond that the distance decreases slowly.The horizontal components are smaller than the local seismic design spectrum,while the vertical component for natural period under 0.15 s exceeds the seismic design spectrum,but the natural periods of general buildings are usually beyond that domain,so this will not have much effect on the nearby buildings.Ground vibration accelerations caused by the collapse of blasting demolition of urban viaducts was recorded in ordered to analyze the engineering characteristics and effects on the surrounding buildings. Through the analysis of peak ground acceleration, peak frequency, duration and response spectra of the recorded vibrations in different acceleration arrays, some conclusions are drawn： the peak ground acceleration decreases with increasing distance, and the amplitude of vertical component is higher than that of the horizontal components, especially in near source region. The peak frequency of ground acceleration decreases with distance, and in near source region, it is larger than the natural frequency of the surrounding buildings, and thus it will not have much effect on the buildings. The duration of ground acceleration caused by collapse is longer than that caused by blasting itself. The vertical response spectrum is the largest of the three components, and it decreases rapidly in the near source region of about 30 m, but beyond that the distance decreases slowly. The horizontal components are smaller than the local seismic design spectrum, while the vertical component for natural period under 0.15 s exceeds the seismic design spectrum, but the natural periods of general buildings are usually beyond that domain, so this will not have much effect on the nearby buildings.

关 键 词：urban viaduct blasting demolition ground vibration vibration effect 

分 类 号：TU375[建筑科学—结构工程]