基于虚拟裂缝模型的带横缝高拱坝的抗震性能研究
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摘要
针对国内某高拱坝,基于Hillerborg断裂力学理论的混凝土本构模型,采用constraint-function的接触算法,考虑大坝的横缝和诱导缝,建立三维坝体-地基动力相互作用分析模型。选取不同地震波,对模型进行非线性动力时程分析,研究地震过程中混凝土坝体拉-压交替的受力规律以及动力损伤的开裂过程,分析横缝和诱导缝在地震中开合往复的工作性态。研究方法和研究成果对评价高拱坝的抗震性能提供一种有效的方法。
This paper develops a 3D model of dam-foundation dynamic interaction for a high arch dam in China,based on the concrete constitutive model of Hillerborg fracture theory for modeling of contraction joints and induced joints,using a constraint-function contact algorithm.Different seismic waves are used for numerical simulations,and the calculated non-linear dynamic time-history are analyzed,focusing on the variations of tension-compression cycles of dam concrete and damage cracking process and the alternative opening-closing behaviors of contraction joints and induced joints.This work provides valuable references and effective methods for assessment of aseismic ability of arch dam.
This paper develops a 3D model of dam-foundation dynamic interaction for a high arch dam in China,based on the concrete constitutive model of Hillerborg fracture theory for modeling of contraction joints and induced joints,using a constraint-function contact algorithm.Different seismic waves are used for numerical simulations,and the calculated non-linear dynamic time-history are analyzed,focusing on the variations of tension-compression cycles of dam concrete and damage cracking process and the alternative opening-closing behaviors of contraction joints and induced joints.This work provides valuable references and effective methods for assessment of aseismic ability of arch dam.
引文
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[2]Ftima M B,Leger P.Seismic stability of cracked concrete dams using rigid block models[J].Computers and Structures,2006,(84):1802～1814.
[3]潘坚文,王进廷,张楚汉.强震作用下拱坝的损伤开裂分析[J].水利学报,2007,38(2):143～149.PAN Jianwen,WANG Jinting,ZHANG Chuhan.Analysis of damage and cracking in arch dams subjected to extremely strong earthquake[J].Journal of Hydraulic Engineering,2007,38(2):143～149.(in Chinese)
[4]Mao M,Taylor C A.Non-linear seismic cracking analysis of medium-height concrete gravity dams[J].Computers and Structures,1997,(64):1197～1204.
[5]ADINA R&D,Inc.ADINA Theory and Modeling guide Volume I:ADINA Solid&Structures[M].USA,2005,457～551.
[6]Bathe K J,Bouzinov P A.On the constraint function method for contact problem[J].Computers and Structures,1997,(64):1069～1085.
[7]王勖成.有限单元法[M].北京:清华大学出版社,2003:666～700.WANG Xucheng.Finite element method[M].Beijing,Thinghua University Press,2003:666～700.(in Chinese)
[8]胡聿贤.地震工程学[M].北京,地震出版社,2006:320～323.HU Yuxian.Earthquake Engineering[M].Beijing,Press of Earthquake,2006:320～323.(in Chinese)
[9]中国水利水电科学研究院.水工建筑物抗震设计规范(DL5073-2000)[S].北京:中国水利水电出版社,2001.China Institute of Water Resources and Hydropower Research.Specification for seismic design of hydraulic structure(DL5073-2000)[S].Beijing:China Waterpower Press,2001.(in Chinese)
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