摘要
构皮滩拱坝是目前世界上在建的高混凝土拱坝之一,由于构皮滩工程规模大,施工技术复杂,对坝体进行温度应力仿真计算,分析研究各种不同参数对坝体温度及应力的影响,对搞好大坝的温控设计,保证工程施工质量和进度具有重要意义。影响坝体温度场及温度应力的参数很多,通过全过程模拟混凝土拱坝施工过程,采用三维有限元法计算分析了混凝土绝热温升、弹性模量及封拱前残余温度应力对坝体温度及应力的影响。研究结果表明:绝热温升的变化对坝体早期最高温度有很大的影响作用;弹性模量与温度应力基本上成线性关系;考虑施工期温度残余应力后,所计算的各项应力指标总体上比按拱坝规范算法计算的坝体运行期综合应力偏大。
Goupitan Arch Dam （max. dam height 232.5 m） is one of highest concrete arch dams under construction in the world at present. Because its engineering scale is huge and the technique of construction complex, studying the effects of some parameters on arch dam thermal stress field would result in an important action which can contribute to doing a better temperature control design and ensure engineering construction quality and scheduling. There are many parameters affecting on arch dam thermal stress field. By use of 3D finite-element method simulating the whole process of concrete construction, the effects of some parameters （adiabatic temperature rise, elastic modulus and residual thermal stress before sealing dam slot） on arch dam thermal stress field are analyzed. The study results are concluded as follows： The change of adiabatic temperature rise has very great influence on the temperature of the dam in early stage; elastic modulus and thermal stress are a linear relationship; in consideration of residual thermal stress before sealing dam slot, the calculated stress data are more than the synthesis stresses calculated according to the arch dam specification.
出处
《长江科学院院报》
CSCD
北大核心
2009年第3期44-48,共5页
Journal of Changjiang River Scientific Research Institute
关键词
温度应力
仿真计算
绝热温升
弹性模量
残余温度应力
有限元法
thermal stresses
simulate calculation
adiabatic temperature rise
elastic modulus
residual thermalstress
FEM
