基于混凝土损伤理论的重力坝体型优化设计

Shape Optimization Design of Gravity Dam Based on Concrete Damage Theory

重力坝体型优化设计一直以来都是一个重要的研究课题,在施工和运行过程中,长期在荷载作用下坝体不可避免的会产生损伤,使材料性能劣化,尤其是在应力集中较大的坝踵附近,因此在重力坝体型优化设计中应该考虑损伤的影响。在常规优化设计的基础上,基于混凝土指数函数损伤理论,考虑和限制坝踵的损伤的发展,采用有限元软件ANSYS自带的一阶优化法,全程编写分析文件和优化文件的ADPL语言对某重力坝进行体型优化设计,得出当将坝踵损伤控制在峰值损伤时,既可以控制损伤的进一步发展,保证坝体的安全,同时也可得到较为经济的剖面形态,该重力坝剖面形态比常规设计得到的结果更符合重力坝材料性能劣化后的工作性态,可为以后的坝工设计提供一定的参考。

The optimization design of gravity dam shape has always been an important research topic.Damage will inevitably occur to the dam in the process of construction and operation under the long-term load,which will deteriorate the material performance,especially near the heel of the dam where the stress concentration is large.Therefore,the impact of damage should be considered in the optimization design of gravity dam shape.Based on the conventional optimization design and damage theory of concrete exponential function,in this study the development of dam heel damage was considered and restricted,the first-order optimization method of finite element software ANSYS was adopted to compile the ADPL language of analysis documents and optimization documents to optimize the shape of a gravity dam,concluding that when the dam heel damage was controlled at the peak value,it could not only control the further development of the damage and ensure the safety of the dam,but also obtain a more economical profile shape.Such gravity dam was more consistent in terms of working performance after the deterioration of the material properties than the conventional design,which provides some reference for the future dam design.