目前常采用线弹性徐变模型进行混凝土坝施工期温度应力的仿真分析.当混凝土应力较小时,采用线弹性徐变模型是可行的,但当混凝土应力超过相应龄期抗拉强度的一半时,混凝土的徐变变形与应力之间呈现出明显的非线性关系.改进的非线性徐变模型能考虑徐变变形与应力的非线性关系,将改进的混凝土非线性徐变模型应用到缅甸DAPEIN大坝的施工期温度应力仿真分析中,仿真结果表明,采用线弹性徐变模型与改进的非线性徐变模型计算的徐变温度应力差别较大,采用传统线弹性徐变模型计算的温度应力偏大. At present, linear elastic creep model is often used to simulate the temperature stress of concrete dams during construction.When the concrete stress is small, it is feasible to adopt the linear elastic creep model, but when the concrete stress exceeds half of the corresponding age tensile strength, The creep deformation and stress of concrete show obvious non-linear relationship.The improved nonlinear creep model can consider the nonlinear relationship between creep deformation and stress, and the improved concrete nonlinear creep model is applied to Myanmar DAPEIN large During the simulation of temperature stress during the construction period of the dam, the simulation results show that there is a big difference between the calculated temperature stress and the linear creep model. The temperature stress bias calculated by the traditional linear creep model Big.