混凝土高坝温度应力仿真分析的三分区算法

摘要

To solve the problem of too long simulating time in thermal stress analysis of high concrete dam, a three-zone algorithm is proposed, which includes new concrete zone, transition zone and old con⁃crete zone. Relatively small time step is adopted in the new concrete zone while relatively larger time step is adopted in both the transition and old concrete zone. The influence of the temperature change in the new concrete zone on the deformation in the old concrete zone is studied by the finite element method. A formula is proposed to calculate depth impact coefficient,which is used to solve the critical problem of rea⁃sonable partitioning. Three-zone algorithm can not only save a lot of simulating time, but also ensure the calculation error within an acceptable limit.%　　针对混凝土高坝温度应力仿真分析中计算时间过长的问题，提出了三分区算法——新混凝土区、过渡区和老混凝土区，在新混凝土区采用小的时间步长，在过渡区和老混凝土区采用比较大的时间步长。通过有限元仿真分析，研究了坝体新混凝土区温度变化对老混凝土中变形的影响，提出了影响深度系数的计算公式，解决了三分区算法中合理分区的关键问题。三分区算法既可以节省大量计算机时，又能够保证计算误差小。