摘要
本文在对冰温度膨胀力的作用机理作简要分析的基础上,将有限元方法引入到冰温度膨胀力的计算中,对工程中常见的两类边界条件(即固定约束和摩擦约束)下的冰温度膨胀力进行了计算。通过对计算结果的分析,得到以下结论:从与现场实测数据的比较来看,有限元计算的结果比较合理,可以在设计中应用;冰盖一侧固定约束、另一侧摩擦约束时,冰作用于固定约束边上的膨胀力会产生高度的应力集中;两侧都是摩擦约束的膨胀力远小于其它约束时的冰膨胀力;温升率对直立墙上冰膨胀力沿冰厚分布的影响远大于对斜坡的影响。
The FEM is applied to calculate the ice thermal expansive pressure acting on the buildings. Two kinds of boundary conditions for the ice cover are to be considered: immovably confined and frictionally confined. The validity of the calculation result is verified by field measurement data. Further analysis shows that the pressure acting on immovable side will be highly concentrated if the other side of the ice cover is confined by friction. When the both sides of the ice cover are confined by friction, the ice thermal pressure will be much less than other types of confinement. The influence of temperature rise-rate on thermal pressure distribution along the depth of a vertical wall is greater that of a slope.
出处
《水利学报》
EI
CSCD
北大核心
2005年第3期314-320,共7页
Journal of Hydraulic Engineering
基金
国家自然科学基金资助项目(50179022)
关键词
冰盖
温度膨胀力
有限元
固定约束
摩擦约束
ice cover
thermal expansive pressure
FEM
immovably confined
frictionally confined
