预应力锚固闸墩有限元分析研究

Discussion on the analysis of finite element of pre-stressed pier

应用大型通用有限元软件ANSYS,对某工程拱坝底孔的外伸悬臂式预应力闸墩进行了三维有限元计算,通过与无预应力闸墩结构对比,分析了由于上下游悬臂和闸墩预应力锚索的布置对坝体应力的影响,表明上、下游悬臂对坝体泄水孔进、出口侧壁应力影响较大,预应力的施加改善了闸墩和大梁的应力状态,但对预留竖井周围的应力分布影响较大。

Application of large finite element software ANSYS, this paper has been carried out the 3D FEM calculation for pre-stressed pier in extending cantilevers of bottom outlet of some double-curvature arch dam. Comparing with conventional structure of pier, the effects on dam＇s stress caused by the disposal of the upriver and downriver cantilevers and pre-stressed anchor of pier have been analyzed and shown that the upriver and downriver cantilevers had great effect on dam＇s stress at the entrance and outlet＇s sides of sluice. The pre-stressed pier has improved the stress state of pier and crossbeam, but it had the great influence on stress distribution near silo.