热膨胀系数对早期混凝土性态影响试验及数值模拟

Experimental Study and Numerical Simulation for the Effect of Thermal Expansion Coefficient on the Behavior of Early Concrete

摘要:

为了更加准确地计算温度应变，对早期混凝土热膨胀系数的变化规律进行了研究.通过试验得出了早期混凝土温度及应变的变化规律，同时基于ABAQUS二次开发平台，开发出了基于水化度的混凝土温度及应变计算子程序，并在此基础上采用不同的热膨胀系数变化模型对试验进行数值模拟.模拟结果表明，不同的热膨胀系数变化模型对试验的模拟结果不尽相同，其中使用指数型下降的热膨胀系数变化规律与试验结果拟合效果更好.

Abstract:

For the more accurate calculation of thermal strain, the change law of the thermal expansion coefficient of early concrete is studied. The change law of early concrete temperature and strain is obtained through the experiment. At the same time, the user subroutine, which to calculate concrete temperature and strain considering hydration degree theory, has been developed based on ABAQUS secondary development platform. And on this basis, The change models of different thermal expansion coefficients are used to simulate the experiment. The numerical simulation results show that simulation results with different thermal expansion coefficient change models are not the same. While the exponential decline change model of the thermal expansion coefficient fits the experimental results better.