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《Chinese Journal of Geophysics》 2012-01
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3D finite element modeling of seismic responses of Baozhusi gravity dam in M_S8.0 Wenchuan Earthquake

XU Yan-Jie1,MU Hai-Lei1,2,ZHANG Chu-Han1,LIU Bing-Lin1,3,LING Hong-Ye1 1 State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China 2 China Three Gorges Corporation,Chengdu 644600,China 3 China Petroleum Engineering & Construction Corp.,Beijing 100120,China  
Baozhusi gravity dam was not destructively damaged during the MS8.0 Wenchuan Earthquake even though the earthquake intensity(0.2 g) at the dam site exceeded the design level of the dam(0.1 g).In order to analyze the dam′s performance to resist the earthquake,we design a three-dimensional model to simulate the dam′s dynamic responses with finite element modeling scheme with consideration of the nonlinearities of contraction joint opening and different combination patterns of three-component seismic processes.Then with 2D elasto-plastic yielding analysis technique we reassess the seismic safety and discuss the possible destruction modals of the dam during strong earthquake with updated seismic fortification levels.The results demonstrate that(1) the transverse component of earthquake motion predominates in the dynamic responses of the dam,and the stream component has relatively weaker excitation to the dam,which is probably the reason that the dam luckily avoided strong damage in the Wenchuan Earthquake.(2) The concrete fracture occurred near the permanent contraction joints at the top of the dam may have resulted from the impact of concrete blocks during joints opening.(3) The dam safety can meet the requirement under the updated design earthquake(0.27 g) and will be lower under the maximum credible earthquake(0.32 g),which may affect the reservoir operating and the resistant abilities to aftershocks.
【Fund】: 水沙科学与水利水电工程国家重点实验室科研课题(2011-KY-3);; 国家自然科学基金项目(40974063);; 地震行业科研专项(200808008)联合资助
【CateGory Index】: TV64;TV312
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