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Experimental Study and Failure Criterion Analysis on Combined Compression-Shear Performance of Self-Compacting Concrete

机译：自密实混凝土组合压剪性能的试验研究与破坏准则分析

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摘要

To investigate the combined compression-shear performance of self-compacting concrete (SCC), eight groups of concrete specimens under different axial compression ratios were designed, and the composite performance under different axial stresses was carried out by hydraulic servo machine. The uniaxial and tensile splitting strength of SCC were also included in the study. The failure modes of SCC were presented, discussed, and compared with normal concrete (NC). The characteristic points of stress-strain curves of SCC specimens from the experiments were extracted and analyzed under different axial compression stress. Based on the experimental results, the shear strength of compression-shear load was divided into cohesive stress and residual friction stress. The variation of residual stress and cohesive stress under the combined compression-shear stress was analyzed, and the relationship was obtained by numerical regression. Research results indicated that the residual stress increases linearly with the compression stress while the cohesive stress increased at first and then decreased. The research found that the friction coefficient of SCC was much smaller than NC due to the lack of interlocking effect. Utilizing the compression-shear strength of SCC, the material failure criteria of SCC were proposed from the view of shear failure strength and octahedral stress space, which could fit the experimental results confidently following the mathematical regression analysis. The comparison with data from other literature shows favorable consistence with the obtained criteria. The results of the study could be beneficial complement in engineering practices where SCC was applicable.
机译：为了研究自密实混凝土的组合抗压剪切性能，设计了八组在不同轴向压缩比下的混凝土试件，并采用液压伺服机在不同轴向应力下进行了复合性能。 SCC的单轴和拉伸劈裂强度也包括在研究中。提出，讨论了SCC的破坏模式，并与普通混凝土（NC）进行了比较。提取并分析了在不同轴向压缩应力下SCC试样的应力-应变曲线的特征点。根据试验结果，将压剪载荷的剪切强度分为内聚应力和残余摩擦应力。分析了组合压剪应力下残余应力和内聚应力的变化，并通过数值回归得到了关系。研究结果表明，残余应力随压缩应力线性增加，而内聚应力先增大然后减小。研究发现，由于缺乏互锁效应，SCC的摩擦系数远小于NC。利用SCC的压缩剪切强度，从剪切破坏强度和八面体应力空间的角度提出了SCC的材料破坏准则，通过数学回归分析，可以可靠地拟合实验结果。与其他文献数据的比较表明，与所获得的标准相符。研究结果可能是适用SCC的工程实践的有益补充。

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