爆破地震波频率对多自由度弹性体系动力响应的影响分析
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摘要
通过对一个三自由度弹性体系在垂直方向上分别加载多个不同主频的实测爆破地震波和理想正弦波,使用集中冲量法利用计算机编程求解出各爆破地震波激励下的竖向动力响应,并通过分析该结构体系的各动力响应幅值变化来探讨爆破地震波频率对三自由度弹性体系动力响应的具体影响。计算结果表明,结构的第一自振频率在分析结构各层质点的响应幅值中起主导地位;考虑爆破地震波是一个包含很多频率成分的复杂的振动信号,在分析实测爆破地震波频率对结构动态响应的影响时,除主频外,应同时考虑其它占有相当能量比例的优势频率的影响。
The measured blasting seismic waves and the ideal sine waves of different dominant frequencies were separately loaded on the three degrees of freedom elastic system in vertical direction.The dynamic response under excitation of each blasting seismic wave in vertical direction was calculated with central impulse method.The variation of peak values of the structural dynamic responses was analyzed to discuss the specific effect of blasting seismic wave frequency on dynamic response of the system.The results show that the first natural frequency of the structure has dominant effect on peak values of dynamic response of structure.Other dominant frequencies with a larger proportion of total energy should be taken into consideration in addition to the basic main frequency.
The measured blasting seismic waves and the ideal sine waves of different dominant frequencies were separately loaded on the three degrees of freedom elastic system in vertical direction.The dynamic response under excitation of each blasting seismic wave in vertical direction was calculated with central impulse method.The variation of peak values of the structural dynamic responses was analyzed to discuss the specific effect of blasting seismic wave frequency on dynamic response of the system.The results show that the first natural frequency of the structure has dominant effect on peak values of dynamic response of structure.Other dominant frequencies with a larger proportion of total energy should be taken into consideration in addition to the basic main frequency.
引文
[1]刘满堂,陈庆寿.建筑结构对爆破地震的动力响应特性研究[J].爆破,2005,22(4):23-27.
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[7]霍永基.建筑结构爆破震动效应及安全分析研究[J].爆破,2003,20(1):1-6.
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[9]汪芳.框架结构在爆破地震波作用下的动力安全性分析[D].武汉:武汉理工大学,2006.
[10]田运生,田会礼,于亚伦,等.爆破地震波作用下民房破坏分析和破坏特征[J].爆破,2005,22(1):96-98.
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[12]John M Biggs(姚玲森,程翔云译).结构动力学[M].北京:人民交通出版社,1982,7-19.
[13]贺国京,阎奇武,袁锦根.工程结构弹塑性地震反应[M].北京:中国铁道出版社,2005,27-28,45-46.
[14]杨建国.小波分析及其工程应用[M].北京:机械工业出版社,2005,63-101.
[2]钱七虎,陈士海.爆破地震效应[J].爆破,2004,21(2):1-5.
[3]杨伟林,杨柏坡.爆破地震动效应的数值模拟分析[J].地震工程与工程振动,2005,25(1):8-13.
[4]Dowding C H,Murray P D,Atmatzidis D K.Dynamical re-sponse properties of residential structures subjected to blastingvibration[J].J Struct Eng ASCE,1981,107(ST2):1233-1249.
[5]Hao H,Ma G W,Lu Y.Damage assessment of masonry infilled RC frames subjected to blasting induced ground excita-tions[J].Eng Struct,2002,24(5):799-809.
[6]Lu Y,Hao H,Ma G W,et al.Simulation of structural re-sponse under high-frequency ground excitation[J].Earth-quake Eng Struct Dyn,2001,30(2):307-325.
[7]霍永基.建筑结构爆破震动效应及安全分析研究[J].爆破,2003,20(1):1-6.
[8]陈士海.爆破地震动作用下结构破坏安全标准研究[D].南京:中国人民解放军理工大学,2004.
[9]汪芳.框架结构在爆破地震波作用下的动力安全性分析[D].武汉:武汉理工大学,2006.
[10]田运生,田会礼,于亚伦,等.爆破地震波作用下民房破坏分析和破坏特征[J].爆破,2005,22(1):96-98.
[11]曹孝君,张继春,吕和林.频率对爆破地震作用下结构的动力响应的影响研究[J].爆破,2006,23(2):14-19.
[12]John M Biggs(姚玲森,程翔云译).结构动力学[M].北京:人民交通出版社,1982,7-19.
[13]贺国京,阎奇武,袁锦根.工程结构弹塑性地震反应[M].北京:中国铁道出版社,2005,27-28,45-46.
[14]杨建国.小波分析及其工程应用[M].北京:机械工业出版社,2005,63-101.
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