冰温度膨胀力对渡槽结构影响的有限元分析

在对冰温度膨胀力进行简要分析的基础上，采用冰的黏弹性模型，将有限元方法引入冰温度膨胀力对预应力混凝土渡槽结构影响的计算中．针对工程中常见的受固定约束的冰层对渡槽结构的影响进行有限元建模计算．通过分析可知，冰温度膨胀力会使底板上侧靠近边墙附近产生较高的应力集中，会引起局部结构的破坏．同时，对模型进行冰层厚度和不同温升时间的敏感性分析．结果表明，当温升时间相同时，冰温度膨胀力会随着冰层厚度的增大而增加．

Finite Element Analysis of Ice Thermal Expansive Pressure Acting on Aqueduct Structure

On the basis of brief analysis of ice thermal expansive pressure, using the ice creep model, the finite element method was used to calculate ice thermal expansive pressure acting on prestressed concrete aqueduct. According to actual project, the immovably confined boundary condition for the ice cover was considered. Further analysis shows that the stress on the upside of motherboard near the side wall will be highly concentrated, so part of the aqueduct structure may be destroyed. Then the sensitivity analysis in allusion to the thickness of ice layer and the calefactive time was processed. Results show that with the same calefactive time, the ice thermal expansive pressure increases as the thickness of ice cover is augmented.