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中文摘要：
为得到合适的早龄期混凝土软化曲线，更好地研究混凝土早期性能，以早龄期混凝土基本力学性能试验及断裂性能试验为基础，借助有限元软件ABAQUS对早龄期混凝土Ⅰ型开裂进行了数值模拟．通过对混凝土3点弯曲梁断裂过程数值模拟结果与试验结果的分析，总结了双线性软化曲线模型与非线性软化曲线模型的优缺点，并在此基础上提出一种新的软化曲线模型——混合型软化曲线模型．数值计算结果与试验结果表明，混合型软化曲线模型可以准确地描述混凝土的开裂软化行为，分析混凝土的断裂性能。
英文摘要：
I type cracking of early-age concrete was simulated with finite element program ABAQUS based on the basic mechanical experiment and fracture performance experiment in order to obtain reasonable softening curve for better studying properties of early-age concrete. The advantages and defects of linear and nonlinear softening curves were concluded by analyzing the numerical and experimental results of concrete fracture properties of three-point bending beams. A new softening curve, comprehensive softening curve, was proposed to predict the cracking softening behavior and fracture performance of concrete. The numerical analysis accorded with the experimental results.
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