基于Hilbert谱的爆破震动瞬时输入能量模型及计算
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摘要
爆破震动对建(构)筑物的影响实质是能量的传递,能量法可较好地体现震动强度、频谱特性,特别是震动持续时间对建(构)筑物破坏的综合影响。瞬时输入能量概念体现了震速与频率的共同作用,建(构)筑物受震破坏主要决定于最大瞬时输入能量的大小。从爆破震动能量破坏机理出发,以能量反应方程为基础,结合瞬时输入能量概念,基于Hilbert谱提出了爆破震动瞬时输入能量模型和最大瞬时输入能量计算方法。
Blast-induced vibration of the surrounding buildings(structures) essentially is caused by energy transfer.The combined effect of vibration intensity,spectrum characteristic,especially vibration duration on the damage of buildings can be reflected by energy method.The concept of momentary input energy can embody the combined action of vibration velocity and frequency.The damage of buildings is mainly depended on the maximum momentary input energy of blast vibration wave.In this paper,from the viewpoint of the damage mechanism of blast vibration energy,based on energy reaction equation,combined with the concept of momentary input energy,on the basis of Hilbert spectrum method,a model of momentary input energy of blast-induced vibration and the calculation method of the maximum momentary input energy are brought forward.
Blast-induced vibration of the surrounding buildings(structures) essentially is caused by energy transfer.The combined effect of vibration intensity,spectrum characteristic,especially vibration duration on the damage of buildings can be reflected by energy method.The concept of momentary input energy can embody the combined action of vibration velocity and frequency.The damage of buildings is mainly depended on the maximum momentary input energy of blast vibration wave.In this paper,from the viewpoint of the damage mechanism of blast vibration energy,based on energy reaction equation,combined with the concept of momentary input energy,on the basis of Hilbert spectrum method,a model of momentary input energy of blast-induced vibration and the calculation method of the maximum momentary input energy are brought forward.
引文
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[2]Naeim F,Anderson J C.Classification and evaluation of earth-quake records for design[R].The NEHRP Professional Fellow-ship Rep,EERI,Oakland,Calif,1993:84~106.
[3]Chia Ming Uang,Bertero V V.Implications of recorded earth-quake ground motions on seismic design of building structures[R].EERC,University of California,report No.UCBIEERC-1988,113:10~40.
[4]Nakamura Y,Hidaka K,Saita J,et al.Strong acceleration anddamage of the 1995 Hyogo-ken-Nanbu earthquake[R].JREarthquake Information Rep.No.236.Japan Railway Tech,Res.Inst,1995.
[5]王亚勇.关于设计反应谱,时程分析法和能量法的探讨[J].建筑建(构)筑物学报,2000,21(1):21~28.
[6]胡冗冗.基于瞬时输入能量的建(构)筑物位移反应研究[D].武汉:华中科技大学,2003.
[7]胡冗冗,王亚勇.地震动瞬时输入能量与建(构)筑物最大位移反应关系研究[J〗。建筑建(构)筑物学报,2000,21(1):71~75.
[8]张义平.爆破震动信号的HHT分析与应用研究[D].长沙:中南大学,2006.
[9]Norio H,Tomaya T,Norio I.Damaging properties of ground mo-tions and response behavior of structures based on momentary en-ergy response[A].Pro of 12th WCEE[C].New Zealand,2000:CD-ROM.
[10]Lieping Ye,Shunsake Otani.Maximum seismic displacement ofinelastic system based on energy concept[J].Earthquake engstruct dyn,1999,28(12):1483~1499.
[11]Huang N E,Shen Z,Long S R,et al.The empirical mode de-composition and the Hilbert spectrum for nonlinear and nonsta-tionary time series analysis[J].Pro.Roy.Soc.London.A,1998,454:903~995.
[12]宋雅桐,朱继澄.结构分析程序设计[M].南京:东南大学出版社,1990.
[13]Chopra A K.Dynamic of structures:theory and applications toearthquake engineering[M].Prentice Hall Inc,EngelwoodCliffs,N J,1995.
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