多轴应力下塑性混凝土峰值后变形特征

发布时间：2018-04-16 14:02

  本文选题：塑性混凝土 + 峰值后变形　； 参考：《建筑材料学报》2014年04期

【摘要】：通过单轴压缩试验以及侧压恒定和侧向位移恒定的2类真三轴压缩试验,研究了塑性混凝土峰值后变形特征.结果表明:塑性混凝土峰值后变形特征与试验的侧限条件密切相关.塑性混凝土在单轴受压情况下,峰值后变形呈现软化特征;在侧压恒定的真三轴压缩试验下,峰值后变形呈现理想塑化或近似塑化特征,试件的破坏主要表现为双向剪切破坏,且破坏方向与最小主应力方向一致;在侧向位移恒定的真三轴压缩试验下,峰值后变形呈现硬化特征,试件的破坏主要表现为轴向过大的压缩变形.当变形参数D20时,峰值后变形表现为硬化;当-0.1≤D20时,峰值后变形表现为理想塑化或近似塑化;当D2-0.1时,峰值后变形表现为软化.
[Abstract]:Through uniaxial compression test and two kinds of true triaxial compression tests with constant lateral pressure and constant lateral displacement, the deformation characteristics of plastic concrete after peak value are studied.The results show that the deformation characteristics of plastic concrete after peak value are closely related to the lateral limit condition of the test.Under uniaxial compression, the deformation of plastic concrete shows softening after peak deformation, and under the true triaxial compression test with constant lateral pressure, the post-peak deformation presents ideal plasticization or approximate plasticization, and the failure of the specimen is mainly manifested as bidirectional shear failure.And the direction of failure is consistent with the direction of minimum principal stress. In the true triaxial compression test with constant lateral displacement, the post-peak deformation shows hardening characteristics, and the failure of the specimen mainly shows axial compression deformation.When the deformation parameter is D20, the post-peak deformation is hardening; when -0.1 鈮，

本文编号：1759206