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利用真三轴液压伺服试验机,对3种强度的高延性纤维增强水泥基复合材料(Engineered Cementitious Composites,ECC)进行了双轴压试验研究,得到了ECC在双轴压应力状态下的破坏形态、极限强度和应力-应变曲线,并与普通混凝土的试验结果进行对比,分析了不同应力比下ECC的破坏机理和主压强度的变化规律。试验结果表明,双轴压应力状态下,ECC强度包络线与普通混凝土有一定差别,强度较低时两者结果相近,但强度较高时相同应力比下ECC主压强度增幅明显小于混凝土。最后,基于Kupfer等建立的普通混凝土的强度准则和试验结果,提出了ECC的双轴压强度破坏准则。
Using a true triaxial hydraulic servo testing machine, three kinds of high strength ductile Engineered Cementitious Composites (ECC) were tested under biaxial compression. The failure mode of ECC under biaxial compressive stress , Ultimate strength and stress-strain curve. Compared with the test results of ordinary concrete, the failure mechanism of ECC under different stress ratios and the change rule of the main compressive strength are analyzed. The experimental results show that under the condition of biaxial compressive stress, the envelope of ECC strength is different from that of ordinary concrete. When the strength is low, the results of both are similar, but the increase of ECC main strength under the same stress ratio is obviously smaller than that of concrete. Finally, based on the strength criterion and test results of normal concrete established by Kupfer et al., The failure criterion of biaxial compressive strength of ECC is proposed.