某拱坝预应力闸墩厚度优化设计  

Optimal Design on Thickness of the Arch Dam Prestressed Pier

作　　者：张丽[1] 陈然[1] 陈晓年[2] 

机构地区：[1]华北水利水电学院水利学院,河南郑州450011 [2]黄河勘测规划设计有限公司,河南郑州450003

出　　处：《人民黄河》2013年第5期90-91,95,共3页Yellow River

摘　　要：以某拱坝工程3#、4#导流底孔出口闸墩为例,采用三维有限元分析法,研究闸墩在不同厚度下支铰大梁与闸墩连接处第一主应力最大值和支铰大梁跨中截面下游面第一主应力最大值的变化趋势及出口闸墩、支铰大梁、与闸墩连接的坝体的应力分布情况。结果表明:当施加预应力后,支铰大梁与闸墩内侧连接处和支铰大梁跨中截面下游侧第一主应力最大值明显减小,最关键部位支铰大梁与闸墩连接处第一主应力减小明显;闸墩厚度为4.5m时,支铰大梁与闸墩内侧连接处和支铰大梁跨中截面下游侧第一主应力最大值明显减小,闸墩和坝体连接处的有效范围增大,闸墩的应力状态也较闸墩厚度为4.0m时好,综合比较,选取闸墩厚度为4.5m。但此时第一主应力值仍较大,因此需要改变预应力锚索吨位来进行调整。Taking No. 3, No. 4 diversion bottom outlet export piers of an arch dam in construction project for an example ,the article particularly re- searched on the trend of the maximum value of principal stress which was in trunnion pier and pier connections, and trunnion beam cross-section downstream face when the pier was in the different thickness. It also researched on the stress distribution of export pier ,pivot pier and the pier con- nection to the dam. The analysis shows that： when prestressed, the maximum trunnion girders and pier at the junction of the medial and trunnion girder cross-section downstream side of the first principal stress has been significantly improved, especially in the most critical parts of the trunnion beam and pier; when the thickness of pier is 4.5 m , the trunnion beam and the inside of the pier connections and trunnion beam cross-section downstream side of the first maximum principal stress significantly reduced, the effective range of the pier and dam connections increased, the stress state of pier was better than the pier in thickness of 4.0 m, comprehensive comparison, select pier thickness of 4.5 m. But the first principal stress is still larger, and therefore, it needs to change the tonnage of prestressed anchor cables to make the adjustment.

关 键 词：拱坝 预应力 闸墩厚度 有限元 优化 

分 类 号：TV662[水利工程—水利水电工程]