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《Explosion and Shock Waves》 2010-04
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Computational model and safety criterion of blasting vibration effect based on wavelet packet techniques

CHEN Shi-hai1,WEI Hai-xia1,2,ZHANG An-kang1,MAO Xiao-hui1(1.College of Civil Engineering and Architecture,Shandong University ofScience and Technology,Qingdao 266510,Shandong,China;2.School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,Henan,China)  
Complex measured velocity signals of blasting vibration are transformed into the superposition of several simple harmonic waves by the wavelet packet decomposition and reconstruction techniques.In this way,the problem of structural dynamic response under the action of blasting velocity load becomes the problem of that under a series of simple harmonic loads.By introducing a new concept of velocity factor into the computational model of blasting vibration effect,the contribution of structural transient response is considered into structural dynamic response.At the meantime,normalized energy proportion is added to the computational model,and only dominant frequencies of relatively large energy proportions can be included when considering the influence of blasting load frequencies.Then,on the basis of the model above,a new safety criterion of blasting vibration effect is put forward,which can reflect the relation between the structural velocity response magnitude under blasting load stimulation and the following parameters: structural characteristics,amplitude,frequencies including several dominant frequencies,duration and energy proportion of blasting load.In the end,by combining with an actual engineering case,velocity response amplitudes are calculated by the computational model put forward in this paper and the temporal analysis method,respectively.And the computational results show that this computational model is feasible.
【Fund】: 国家自然科学基金项目(50778107);; 教育部高校博士学科点专项基金项目(20060424002);; 山东省泰山学者建设工程专项项目~~
【CateGory Index】: TU751.9
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