桐柏电站混凝土基础水化热温度场有限元分析

 基于考虑温度和化学反应物浓度对化学反应速率影响的混凝土水泥水化反应放热模型，编制二维混凝土水化热温度场有限元分析程序。该程序通过控制各单元对整体刚度矩阵及整体荷载矢量列阵的贡献模拟大体积混凝土分层浇注时温度场的变化。根据单元参与组集情况对计算机内存实行动态分配，不但提高计算效率又可避免常规做法导致的整体刚度矩阵病态。将该程序用于桐柏抽水蓄能电站大体积混凝土基础的施工期温度场分析。计算结果表明，该方法能较好地反应混凝土施工期温度场的变化，同现场实测数据吻合较好。

FINITE ELEMENT ANALYSIS OF HYDRATION HEAT TEMPERATURE FIELD IN CONCRETE FOUNDATION OF TONGBAI POWER STATION

A thermal analysis is carried out using two-dimensional finite element method(FEM) to simulate the construction process of a massive concrete foundation of Tongbai power station in China. A new exothermal model of cement hydration in concrete considering the effects of temperature and concentration of chemical reactant is incorporated into the finite element numerical simulations. The change of temperature field during laminated pouring of massive concrete is obtained by controlling the contribution of each element to global stiffness matrix and load vector in different construction stages. Dynamic memory allocation is accomplished to improve the computation efficiency and to avoid the singularity of the global stiffness matrix. The actual temperature is also measured in the field using thermocouples installed within the foundation. The study demonstrates that the two-dimensional finite element analysis is adequate to predict the temperature distribution in the foundation.