摘要
在拱坝应力分析中,有限单元法在计算理论上优于拱梁分载法,并已经广泛应用于拱坝的仿真计算和应力分析。但在弹性理论下,有限元法应力计算结果与所采用的单元类型存在密切关系,且近基础部位存在着严重的应力集中现象。为了解决这一问题,一些学者提出了等效应力法作为改进,但由于拱坝线型不同,采用的参数计算方法亦不同。因此,对混合线型拱坝等效应力计算方法作了进一步改进,即只需输入混合线型拱坝的参数便可得到6种线型拱坝以及介于这6种线型之间的各种拱坝的等效应力。将该方法得到的等效应力计算结果与拱梁分载法的计算结果进行了对比,验证了其准确性和实用性。
In the stress analysis of arch dams,Finite Element Method（ FEM） is superior to the Arch Cantilever Method（ ACM） in calculating theory and has been widely used in numerical simulations and stress analysis of arch dams. However,according to the assumption of elastic theory,the stress calculation using FEM is affected by the element type,and the stress especially concentrates near the dam base surface. In order to solve this problem,some scholars proposed various equivalent stress methods,however the parameter calculations of these methods are different to the arch dams with different line types. Aiming to this problem,we further improve the equivalent stresses method（ ES）,in which the equivalent stress of the arch dams of six line types and of other arch dams between the six line types could be obtained by the input of the parameters of mixed line types. The calculation results have been compared with those methods based on the Arch Cantilever Method,which verifies the accuracy and practicality of the presented method.
出处
《人民长江》
北大核心
2015年第12期4-7,14,共5页
Yangtze River
关键词
拱坝
等效应力
混合线型
有限单元法
拱梁分载法
arch dam
equivalent stress
mixed line types
Finite Element Method
Arch Cantilever Method
