地基刚度和不均匀性对混凝土大坝地震响应的影响
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摘要
应用比例边界有限元方法进行了坝-水库-无限地基的动力相互作用分析。深入研究了无限地基刚度变化以及地基非均匀性对大坝地震响应的影响。计算了不同的均匀地基刚度和地基刚度随深度变化情况下Koyna大坝的频响曲线以及地震作用下大坝的时程响应。计算结果表明,地基刚度和不均匀性对大坝地震响应产生重要影响。对于均质地基刚度增加时,坝的地震响应随之增加;对于地基刚度随深度增加的不均匀地基,坝的地震响应增加迅速。此外还讨论了工程中广泛应用的无质量地基模型对于相互作用分析的适用性问题。
Effect of dynamic dam-reservoir-foundation interaction, particularly, foundation stiffness and foundation anisotropy on the seismic response of concrete dams was studied. The scaled boundary finite element method presented by Wolf and Song was employed for this investigation. Numerical analyses of the complex frequency response and the time history earthquake response of Koyna dam for various cases of foundation stiffness and foundation anisotropy were performed. It was found that the foundation stiffness and foundation anisotropy play important role in the interaction analysis. The seismic response of dams grows with increase of foundation stiffness especially, when the foundation stiffness increases along with the depth. In addition, the applicability of the widely used massless foundation approach to the dam-foundation interaction analysis is discussed.
Effect of dynamic dam-reservoir-foundation interaction, particularly, foundation stiffness and foundation anisotropy on the seismic response of concrete dams was studied. The scaled boundary finite element method presented by Wolf and Song was employed for this investigation. Numerical analyses of the complex frequency response and the time history earthquake response of Koyna dam for various cases of foundation stiffness and foundation anisotropy were performed. It was found that the foundation stiffness and foundation anisotropy play important role in the interaction analysis. The seismic response of dams grows with increase of foundation stiffness especially, when the foundation stiffness increases along with the depth. In addition, the applicability of the widely used massless foundation approach to the dam-foundation interaction analysis is discussed.
引文
[1]吴健,金峰,张楚汉,王光纶.无限地基辐射阻尼对溪洛渡拱坝地震响应的影响[J].岩土工程学报,2002,24(6):717–719.
[2]杜修力,涂劲,陈厚群.有缝拱坝-地基系统非线性地震激励反应与分析方法[J].地震工程与工程振动,2000,20(1):11–20.
[3]Wolf J P,Chongmin Song.Finite-element modelling of unbounded media[M].John Wiley&Sons,1997.
[4]Bartels R H.Stewart J L.Solution of the matrix equation AX+XB=C[J].Communication of the ACM,1972,15:820–826.
[5]林皋,杜建国.基于SBFEM的坝-库水相互作用分析[J].大连理工大学学报(待刊出).
[6]Junyi Yan,Chuhan Zhang,Feng Jin.A coupling procedure of FE and SBFE for soil-structure interaction in the time domain[J].Iinternational journal for numerical methods in engineering,2004,59:1453–1471.
[7]Wolf J P.Foundation vibration analysis using simple physical models[M].PTR Prentice Hall,1994.
[8]Proulx J.Darbre G R,Kamileris N.Analytical and experimental investigation of damping in arch dams based on recorded earthquakes[A].Proc13th World Conference on Earthquake Engineering[C].Canada:Vancouver,2004.
[2]杜修力,涂劲,陈厚群.有缝拱坝-地基系统非线性地震激励反应与分析方法[J].地震工程与工程振动,2000,20(1):11–20.
[3]Wolf J P,Chongmin Song.Finite-element modelling of unbounded media[M].John Wiley&Sons,1997.
[4]Bartels R H.Stewart J L.Solution of the matrix equation AX+XB=C[J].Communication of the ACM,1972,15:820–826.
[5]林皋,杜建国.基于SBFEM的坝-库水相互作用分析[J].大连理工大学学报(待刊出).
[6]Junyi Yan,Chuhan Zhang,Feng Jin.A coupling procedure of FE and SBFE for soil-structure interaction in the time domain[J].Iinternational journal for numerical methods in engineering,2004,59:1453–1471.
[7]Wolf J P.Foundation vibration analysis using simple physical models[M].PTR Prentice Hall,1994.
[8]Proulx J.Darbre G R,Kamileris N.Analytical and experimental investigation of damping in arch dams based on recorded earthquakes[A].Proc13th World Conference on Earthquake Engineering[C].Canada:Vancouver,2004.
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