丰满大坝静动力特性分析
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摘要
采用非线性接触面单元模型，分析了带缝丰满大坝的静、动力特性．实践了一种有效的接触面静、动力迭代算法．研究表明，丰满坝在ＡＢ缝端插入钢筋棒和下游面采用钢筋网加固处理，是很强的并缝措施，可使坝的静、动力特性与整体坝接近．只是等应力缝跨缝不连续．地震时大坝坝头、缝顶端的结合部及坝镭部位产生了瞬时拉应力集中．且超过规范标准。但这种高应力集中区范围很小，且衰减很快．考虑到经过处理，认为这种局部应力集中，不至于对坝的抗震安全构成威胁，但须加以重视。
The static and dynamic behaviors of the Fengman concrete gravity dam with joints are studied by nonlinear finite element method using contact-friction interface element. An effective static and dynamic iteration method for contact surfaces is put into practice. The research shows that the joints conjunction measures of inserting steel bars at the ends of joints AB and adopting mesh reinforcement at the down stream surface of Fengman Dams improve the performance of the dam to a greater degree. Above engineering measures make static and dynamic behavior of Fengman Dam somewhat similar to that of a monolithic structure whereas the isostress line across the joint becomes discontinuous. When the dam is subject to earthquake, concentration of instantaneous tensile stress, which often exceeds the standard of criterion, will take place at the combining part between the top end of joint, the part of dam head and dam heel. But the concentration area of this kind of high stress is very small and the stress decrease very fast. Since engineering measures have been adopted, the local stress concentration will not cause danger to the seismic safety of the dam but more atten- tion should be paid on it.
The static and dynamic behaviors of the Fengman concrete gravity dam with joints are studied by nonlinear finite element method using contact-friction interface element. An effective static and dynamic iteration method for contact surfaces is put into practice. The research shows that the joints conjunction measures of inserting steel bars at the ends of joints AB and adopting mesh reinforcement at the down stream surface of Fengman Dams improve the performance of the dam to a greater degree. Above engineering measures make static and dynamic behavior of Fengman Dam somewhat similar to that of a monolithic structure whereas the isostress line across the joint becomes discontinuous. When the dam is subject to earthquake, concentration of instantaneous tensile stress, which often exceeds the standard of criterion, will take place at the combining part between the top end of joint, the part of dam head and dam heel. But the concentration area of this kind of high stress is very small and the stress decrease very fast. Since engineering measures have been adopted, the local stress concentration will not cause danger to the seismic safety of the dam but more atten- tion should be paid on it.
引文
[1] DL5073—1997水工建筑物抗震设计规范 [S]
[2]SDJ10—78(试行)水工建筑物抗震设计规范[S]
[3]大连理工大学抗震研究室 丰满大坝首次安全定期检查专题报告──大坝动力特性及抗震安全评价[R],大连:大连理工大学,1997
[4] 颐淦臣.土石坝地震工程[M]南京:河海大学出版社,1989.
[5]丰满发电厂 丰满大坝概括及历次设计简介[R],1995
[2]SDJ10—78(试行)水工建筑物抗震设计规范[S]
[3]大连理工大学抗震研究室 丰满大坝首次安全定期检查专题报告──大坝动力特性及抗震安全评价[R],大连:大连理工大学,1997
[4] 颐淦臣.土石坝地震工程[M]南京:河海大学出版社,1989.
[5]丰满发电厂 丰满大坝概括及历次设计简介[R],1995
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