本文選題：塑性混凝土 + 峰值后變形　； 參考：《建筑材料學(xué)報》2014年04期

【摘要】：通過單軸壓縮試驗(yàn)以及側(cè)壓恒定和側(cè)向位移恒定的2類真三軸壓縮試驗(yàn),研究了塑性混凝土峰值后變形特征.結(jié)果表明:塑性混凝土峰值后變形特征與試驗(yàn)的側(cè)限條件密切相關(guān).塑性混凝土在單軸受壓情況下,峰值后變形呈現(xiàn)軟化特征;在側(cè)壓恒定的真三軸壓縮試驗(yàn)下,峰值后變形呈現(xiàn)理想塑化或近似塑化特征,試件的破壞主要表現(xiàn)為雙向剪切破壞,且破壞方向與最小主應(yīng)力方向一致;在側(cè)向位移恒定的真三軸壓縮試驗(yàn)下,峰值后變形呈現(xiàn)硬化特征,試件的破壞主要表現(xiàn)為軸向過大的壓縮變形.當(dāng)變形參數(shù)D20時,峰值后變形表現(xiàn)為硬化;當(dāng)-0.1≤D20時,峰值后變形表現(xiàn)為理想塑化或近似塑化;當(dāng)D2-0.1時,峰值后變形表現(xiàn)為軟化.
[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，

本文編號：1759206