不同U型锚索布置对预应力闸墩应力与变形的影响

针对如何选用白鹤滩底孔预应力锚索布置方案,采用三维有限元子模型方法对不同U型预应力锚索布置方案下的白鹤滩6#底孔闸墩进行应力和位移分析,初步拟定了两种预应力锚索布置方案。综合比较两种方案下典型剖面及典型剖面上的特征点应力变形情况,判断不同预应力锚索布置方案下闸墩结构的安全性。研究结果表明:对于两种不同的锚索布置方案来说,闸墩与大梁结构的应力与位移均未出现不连续和突变,符合工程经验与应力标准,且方案1的安全性能略优于方案2。其研究成果可为布置锚索的大推力预应力闸墩设计提供参考。

Influence of different U-shaped anchor cable arrangements on stress and deformation of prestressed gate pier

In view of how to choose the prestressed anchor cable layout of Baihetan bottom holes, this paper analyzed stress and displacement of Baihetan 6^# bottom hole with different U-shaped prestressed anchor cable layout schemes using three-dimensional finite element sub-model method, which preliminarily drafts two layouts. The stress and displacement of the typical sections and points was analyzed to determine the safety of the structure in the process of different prestressed anchor cable layout. The results showed that there is no non-uniform distribution and mutation of displacement in the pier and girder structure in the process of different prestressed anchor cable layouts, which is in line with the engineering experience and stress standards, and the security performance of scheme one is slightly better than that of scheme two. The results can provide a reference for the design of anchor cable of the large thrust prestressed gate pier.