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中文摘要：
由于气温的交替变化，处于寒区的混凝土大坝必然产生温度应力。当温度拉应力大于混凝土的抗拉强度时，混凝土大坝闸墩会产生局部裂缝，严重时导致大坝闸墩产生贯穿性裂缝。结合丰满混凝土大坝溢流坝段闸墩加固工程实践，采用非线性有限元数值方法分析了在不同预应力荷载工况下预应力锚固过程中大坝闸墩混凝土的应力变化。根据有限元数值计算结果。提出了优化预应力锚索布置和锚固力大小的方法，解决了大坝堰顶处混凝土在锚固过程中局部拉应力过大的技术难题。工程实际应用结果表明，根据有限元数值模拟结果指导预应力锚索的设计和施工是可行的、所采取的工程技术措施起到了预期的工程效果。
英文摘要：
The thermo stresses in the concrete dam will produce because of changing of weather temperatures. The local fractures in gate pier of dam occur while the thermo stresses exceed the tensile strength of concrete, and sometimes, some fractures can extend from dam top to the spillway siarface. Combining with the pier rehabilitation project of Fengman concrete dam, the nonlinear finite element method is applied for calculating the stress changes of concrete piers during anchoring process in the different load cases. The optimization arrangement method for prestress scales and anchoring locations are presented in order to deal with local stress larger than concrete tensile strength. The practical application shows that numerical simulation approach with finite element method is feasible to guide the design and operation of pier rehabilitation, and the proposed engineering measures are effective for preventing dam pier from local fracturing during anchoring process.
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