Analysis of Compressive Strength and Failure Mechanism Based on Series Homogenization Model for Recycled Concrete

Abstract

本文针对再生混凝土材料，利用均质化分析方法，建立了串联均质化模型，采用新型有限元法——基于余能原理的基面力单元法对再生混凝土进行细观层次的损伤研究，利用所编非线性损伤基面力单元法分析程序，分析了再生混凝土在单轴压缩荷载情况下的应力应变软化曲线和破坏机理，并将计算结果与试验和细观随机骨料模型分析方法的结果进行对比分析。研究结果表明：这种串联均质化分析方法可以用于分析再生混凝土材料的非线性损伤分析，可以得到再生混凝土材料的抗压强度、应力应变软化曲线和裂纹扩展的过程。 The homogenization analysis method was used to establish a series homogenization model for recycled concrete materials in the paper. A new type of finite element method—Base Force Element Method based on complementary energy principle is used to conduct meso-level damage research on recycled concrete. The stress-strain softening curve and failure mechanism of recycled concrete under uniaxial compression load are analyzed using the nonlinear damage analysis program of base force element method. The calculation results are compared with the results of experiments and meso-level random aggregate model analysis methods. The research results show that this series homogenization analysis method can be used to analyze the nonlinear damage analysis of recycled concrete materials. The compressive strength, stress-strain softening curve and crack propagation process of recycled concrete materials can be obtained using the present method.