格八拱坝温度应力有限元分析

Simulation Analysis on Thermal Stress of Geba Arch Dam Based on FEM

利用有限元软件对格八拱坝加固部分新坝体温度场和温度应力场进行了仿真分析。仿真过程中,通过竣工时温度等值线图、第一主应力图,拱冠梁温度包络图、温度应力包络图,以及不同高程的温度变化曲线,得出了格八拱坝温度场和温度应力场的分布规律。有限元分析中考虑了温度场及温度应力场的参数敏感性,混凝土绝热温升随龄期的变化、分成浇筑等因素的影响,具有一定的精度,可以为该坝温控标准和温控防裂措施提供一定的依据。

By using FEM ,the simulation analysis for temperature field and thermal stress field is carried out .During the process of the simulation ,through the isohyetal line chart of temperature ,sigma-p1 ,sigma-p3 ,temperature envelope line chart ,thermal stress envelope chart ,and the various changes in the temperature of several typical node curve ,the change laws of the temperature field and thremal stress field in Geba arch dam are obtained .The factors ,such as the parameter sensitivity of temperature field and thermal stress field ,the change of adiabatic temperature with the ages of concrete and concrete placing by layer ,are considered in the analysis ,thus to have a certain accuracy ,which could provide a certain basis for the appropriate temperature control standard and corresponding anti-crack measures of the dam .