某泄洪排沙闸预应力边墩有限元计算分析

Analysis of Finite Element of Prestressed Abutment Pier of Releasing Flood and Discharging Sand Sluice

采用三维有限元方法,在不同荷载组合下,计算分析了预应力边墩在不对称荷载作用下闸墩颈部、锚块等关键部位的应力分布规律。结果显示:施加预应力可以解决承受大吨位弧门推力边墩的高拉应力状态;锚块受力基本合理,只在空腔前后出现较大拉应力,应根据结构受力状态进行配筋;闸墩的高拉应力区主要分布于闸墩颈部,但拉应力较小,能够满足预应力混凝土结构对拉应力的要求,闸墩结构安全。

Based on three-dimensional finite element method,under the different load combination,the prestressed abutment pier in the asymmetric loading pier neck,anchor block,and other key parts of the stress distribution were studied.The results show that the prestressing force could solve the state of high tensile stress of the abutment pier supporting large tonnage radial gate thrust,anchor block stress is basically reasonable.A larger tensile stress only appears in the cavity of it so that the reinforceing bars should be based on the stress state of structure.The high tensile stress zones mainly distribute in the pier neck,but the tensile stress is small,which can meet the demand of the prestressed concrete construction to the tensile stress,so the structure of the pier is safe.