基于粘弹性人工边界的防洪堤动力有限元分析
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摘要
以大型有限元软件ANSYS为平台,将地震荷载转化为等效节点荷载,通过对比4种不同人工边界条件对地震波的吸收效应,验证了采用粘弹性人工边界在有限元模型时域数值分析方法中的合理性,分析了不同频率下动荷载对结构动力反应的影响,并以福州市闽江防洪堤工程为例,对比分析了在传统的固定边界与粘弹性人工边界两种边界条件下防洪堤的地震响应。结果表明,粘弹性人工边界方法精度高、易于实现、实用性强。
Based on ANSYS,seismic loads are transformed into equivalent nodal loads.Compared with the earthquake wave absorption effect under four different artificial boundary conditions,the rationality of viscoelasticity artificial boundary which is applied in the FE time domain analysis method is verified by numerical examples.And then it analyzes the influence of dynamic load on structural dynamic response under different frequencies.Finally,taking the flood levee project of Minjiang River in Fuzhou City for an example,the traditional fixed-boundary and viscoelasticity artificial boundary are adopted to analyze the seismic response.The results show that the viscoelasticity artificial boundary method has the merits of high precision,simple implementation and powerful practicality.
Based on ANSYS,seismic loads are transformed into equivalent nodal loads.Compared with the earthquake wave absorption effect under four different artificial boundary conditions,the rationality of viscoelasticity artificial boundary which is applied in the FE time domain analysis method is verified by numerical examples.And then it analyzes the influence of dynamic load on structural dynamic response under different frequencies.Finally,taking the flood levee project of Minjiang River in Fuzhou City for an example,the traditional fixed-boundary and viscoelasticity artificial boundary are adopted to analyze the seismic response.The results show that the viscoelasticity artificial boundary method has the merits of high precision,simple implementation and powerful practicality.
引文
[1]廖振鹏.工程波动理论导论(第二版)[M].北京:科学出版社,2002.
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[5]谷音,刘晶波,杜义欣.三维一致粘弹性人工边界及等效粘弹性边界单元[J].工程力学,2007,24(12):31-37.
[6]王振宇,刘晶波.成层地基非线性波动问题人工边界与波动输入研究[J].岩石力学与工程学报,2004,23(7):1 169-1 173.
[7]国家地震局.中国地震烈度区划图[M].北京:地震出版社,1991.
[2]刘晶波,王振宇,杜修力,等.波动问题中的三维时域粘弹性人工边界[J].工程力学,2005,22(6):46-51.
[3]刘晶波,李彬.三维黏弹性静—动力统一人工边界[J].中国科学(E辑),2005,35(9):966-980.
[4]贺向丽,李同春.粘-弹性人工边界在重力坝动力分析中的应用[J].水电能源科学,2006,24(1):30-31,57.
[5]谷音,刘晶波,杜义欣.三维一致粘弹性人工边界及等效粘弹性边界单元[J].工程力学,2007,24(12):31-37.
[6]王振宇,刘晶波.成层地基非线性波动问题人工边界与波动输入研究[J].岩石力学与工程学报,2004,23(7):1 169-1 173.
[7]国家地震局.中国地震烈度区划图[M].北京:地震出版社,1991.
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