对ABAQUS中混凝土弥散开裂模型的静力特性分析

为全面了解ABAQU S有限元软件中混凝土弥散开裂模型分析混凝土材料和构件的能力,用该模型对混凝土材料的单轴、双轴应力状态下力学性能以及构件的抗弯、抗剪性能进行模拟,并与试验结果进行对比分析。结果表明,混凝土弥散开裂模型能较精确地模拟单轴受拉和受压、双轴受压和双轴拉压应力状态下混凝土的力学性能,也能较好地预测钢筋混凝土构件的抗弯和抗剪性能及其相应的破坏形态,但不能很好地描述混凝土双轴受拉应力状态下材料的力学性能,也不能反映体积应变发展变化的规律。

Analysis on static performances of smeared cracking model for concrete in ABAQUS

To evaluate the capacity of the smeared cracking model for concrete in the finite element software ABAQUS and analyze the mechanical properties of concrete materials and structural components, the model was adopted to simulate the mechanical properties of the concrete under uniaxial and biaxial stress condition, and the flexural and shear properties of RC structural components. The numerical results were compared with the test data. The results show that the model can simulate the mechanical properties of the concrete material under uniaxial compression, uniaxial tension, biaxial compression, and biaxial tension and compression conditions. And the model can reflect the failure envelope of the concrete material under biaxial stress condition properly. The flexural and shear properties, as well as the typical failure modes of RC structures can also be predicted by the model. However, the model can not predict the mechanical properties of the concrete material under biaxial tension condition, and the development law of the volume strain of the concrete.