大岗山和溪洛渡高拱坝强地震损伤比较分析
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摘要
采用损伤力学方法对大岗山抛物线型双曲高拱坝进行了强地震损伤破坏分析,获得了大坝的破坏状态和趋势,通过和大连理工大学抗震研究所对该坝模型的试验结果对比,验证了分析的合理性。为研究其他同类型高拱坝在相同强震下的破损响应,选取了溪洛渡高坝进行分析。借鉴大岗山高坝模型破坏试验和数值分析结果,对比分析获得了溪洛渡大坝的合理破坏趋势。研究获得两座高坝的损伤破坏模式和率性对坝体混凝土动强度的影响,分析结果可有效判断大坝的工作性态和了解大坝的抗震安全性能。本文工作为实际类似高拱坝设计、分析及安全评价提供了依据。
Damage and fracture behaviors caused by strong earthquakes are analyzed by using damage mechanics for Dagangshan arch dam and Xiluodu arch dam.First,damage patterns and fracture trend of the Dagangshan dam are obtained and used to predict the earthquake resisting behaviors.The analysis agrees well with the model test of this dam carried out at Dalian University of Technology.Then the same type of arch dam,Xiluodu arch dam is analyzed by using normal working condition and the same earthquake as for Dagangshan.Damage patterns and dynamic strength influenced by strain rate are discussed.Through a comparative analysis with Dagangshan,potential failure modes of Xiluodu dam are discussed.This study shows that the adopted method is effective in safety assessment for high arch dams,and the analysis could be used as a reference for design,analysis and safety evaluation of similar dams.
Damage and fracture behaviors caused by strong earthquakes are analyzed by using damage mechanics for Dagangshan arch dam and Xiluodu arch dam.First,damage patterns and fracture trend of the Dagangshan dam are obtained and used to predict the earthquake resisting behaviors.The analysis agrees well with the model test of this dam carried out at Dalian University of Technology.Then the same type of arch dam,Xiluodu arch dam is analyzed by using normal working condition and the same earthquake as for Dagangshan.Damage patterns and dynamic strength influenced by strain rate are discussed.Through a comparative analysis with Dagangshan,potential failure modes of Xiluodu dam are discussed.This study shows that the adopted method is effective in safety assessment for high arch dams,and the analysis could be used as a reference for design,analysis and safety evaluation of similar dams.
引文
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[3]Li Qingbin,Zhang Chuhan,Wang Guanglun.Dynamic damage constitutive model of concrete in uniaxial tension[J].EngineeringFracture Mechnics,1996,53(3):449～455.
[4]Du R,Lin G,Leng F.Elastoplastic-Damage Analysis for Arch Dams Considering Multiaxial Stresses Effect[A].Hillbert Mang,Mazars J,Bicnic N.EURO-C2006,Computational Model-ling of Concrete Structures[C],27th-30th,March 2006,Mayrhofen,Tyrol,Austria.329～336.
[5]Lu Yong,Xu Kai.Modelling of dynamic behavior of concrete materials under blast loading[J].International Journal of SolidsStructures,2004,(41):131～143.
[6]Du Jiaji,Kobayashi A S,Hawkins N M.FEM dynamic fracture analysis of concrete beams[J].Journal of Engineering Mechnics,1989,115(10):2138～2149.
[7]刘军.混凝土损伤分析及其工程应用[D].大连:大连理工大学学位论文,2004.LIU Jun.The damage analysis of concrete and its engineering application[D].Dalian:Dalian University of Technology,2007.(inChinese)
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