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《Journal of Dalian University of Technology》 2011-01
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Nonlinear overloading analyses of arch dam-unbounded foundation subjected to earthquakes

ZHONG Hong1,2,LIN Gao1,2,LI Hong-jun3(1.State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;2.Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;3.China Institute of Water Resources and Hydropower Research,Beijing 100048,China)  
As shown by the experience obtained from Wenchuan Earthquake,high arch dams are likely to experience ground motion much stronger than their design value.So it becomes extremely important for avoiding serious earthquake disasters to investigate the damage of arch dams subjected to earthquakes and examine their seismic overloading capacity.The damage of an arch dam subjected to earthquakes of different intensities is studied.The damage model for dynamic analysis of arch dams which incorporates the heterogeneity of concrete is employed.The radiation damping of unbounded media is also considered using the arch dam-foundation interaction model based on damping solvent extraction method.According to numerical simulation,the investigated dam only suffers negligible damage when subjected to design earthquake and twice the design earthquake.While for the case of three times the design earthquake,many microcracks occur,but are generally scattered and don′t form macrocracks,so the integrity and water-pounding function of the dam are retained.Since the degree of nonlinearity is not high within three times the design earthquake,the distribution of response of the dam is similar for different levels of earthquake intensity.In a word,this dam has remarkable seismic overloading capacity.
【Fund】: 国家自然科学基金资助项目(90510018 51009019 90915009);; “九七三”国家高技术研究发展计划资助项目(2007CB714107)
【CateGory Index】: TV642.4;TV312
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