基于预应力实测资料的闸墩结构安全评估研究

发布时间：2018-05-02 20:25

本文选题：闸墩结构 + 预应力锚索　；参考：《水利水电技术》2017年09期

【摘要】：针对闸墩中孔周边区域应力分布复杂的问题,进行三维有限元分析。为准确评估中孔闸墩结构运行期的安全性,根据整体拱坝模型计算结果,运用子模型方法,获取各种工况下中孔闸墩结构的局部边界条件,基于锚索测力计实测数据,建立考虑时效、外界温度及上游水位波动等影响的预应力回归模型。在此基础上,采用三维非线性有限元分析方法对西南某碾压混凝土拱坝中孔闸墩结构进行全面安全评价。计算结果表明:当前工作状态下,闸墩结构应力分布规律与设计状态基本相同,颈部最大法向应力为1.27 MPa,出现在左中孔右边墙位置,小于允许拉应力1.54 MPa,满足闸墩抗裂要求。
[Abstract]:Three-dimensional finite element analysis is carried out to solve the problem of complex stress distribution around the middle hole of pier. In order to accurately evaluate the safety of the mid-hole pier structure during operation, according to the calculation results of the integral arch dam model, the local boundary conditions of the mesopole pier structure under various working conditions are obtained by using the sub-model method, and the measured data of the anchor cable dynamometer are based on the measured data. A regression model of prestress considering the effects of aging, external temperature and upstream water level is established. On this basis, the safety of the middle hole pier structure of a roller compacted concrete arch dam in southwest China is evaluated by using three dimensional nonlinear finite element analysis method. The results show that the stress distribution law of the pier structure is basically the same as the design state in the current working state, and the maximum normal stress of the neck is 1.27 MPA, which appears in the right wall of the left and middle hole and is less than the allowable tensile stress of 1.54 MPA, which meets the requirements of pier crack resistance.
【作者单位】：中国水利水电科学研究院;中国电建集团贵阳勘测设计研究院有限公司;
【基金】：国家科技重大专项(2016YFC0401809、2016YFB0201001)
【分类号】：TV662.2

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