锚块预留槽预应力闸墩结构的二维有限元计算

Two-dimensional Finite Element Method Calculation of Prestressed Pier with Anchor Block Reserved Slot

锚块预留槽预应力闸墩是一种新型水工结构,由于其可以提高预应力锚索的预压效果,而被广泛运用于国内外的水电工程中。为便于分析预留槽对闸墩应力状态的影响,探讨了采用二维模型进行有限元计算的可行性,并利用单元生死功能计算和分析了不同预留槽位置对闸墩的应力分布状况的影响。计算结果表明,利用二维模型进行预应力闸墩结构的有限元计算能有效提高工程设计的效率,将预留槽设置在锚块中部及靠近颈部的区域更有利于提高预应力锚索的预压效果。

Prestressed pier with anchor block reserved slot is a new type of hydraulic structure,which has been used in domestic and international hydropower projects because of the characteristic of raising the preloading effectiveness of prestressed anchor. In order to analyze the stress state of the pier with reserved slot efficiently,In this paper,we discussed the feasibility of the calculation with 2D Finite Element Method model,and analyzed the effect of different positions of the reserved slot to the pier stress distribution with the element birth and death function. The results show that calculation with the 2D Finite Element Method model of prestressed pier can improve engineering design efficiency,and that slot position in the middle or slightly upstream of anchor block will be more conducive to improve the preloading effectiveness of prestressed anchor cable.