[关键词]
[摘要]
为了分析塑性混凝土应力应变关系,共设计8组配合比48个试件,进行了单轴抗压试验,得到了塑性混凝土典型的应力应变曲线。通过将其与常规混凝土应力应变关系曲线进行对比,并从应变、应力、曲线切线斜率、裂缝四个方面进行分析,得到了塑性混凝土全过程的应力应变特性。研究发现,塑性混凝土应力应变曲线上升段ε-lnσ关系符合6次多项式规律,曲线下降段ε-σ可以利用Logistic模型进行较好地模拟,据此,给出了建议的塑性混凝土应力应变曲线分段函数表达式。研究成果对塑性混凝土弹性模量测试、设计、施工等工作具有参考意义。
[Key word]
[Abstract]
In order to characterize the relationship of stress-strain of plastic concrete, the single-axle compressive tests were conducted with eight mix proportions and 48 specimens. Through the analysis of the test results, the typical stress-strain curves were obtained which showed obvious subsection characteristics. The curves were analyzed from the perspectives of strain, stress, tangent slope, and crack, and were compared with the stress-strain curves of traditional concrete, thus the stress-strain characteristics of the whole process of plastic concrete were obtained. Moreover, the regularity of stress-strain curves was investigated, which indicated that the ε-lnσ relationship of the rising section is in line with the polynomial of degree six and the ε-σ relationship of the declining section is better represented with the logistic model. The function expression for each subsection was proposed. The results are of important significance to the test of elastic modulus, design, and construction of plastic concrete.
[中图分类号]
[基金项目]
中央级公益性科研院所基本科研业务费专项资金项目(HKY-JBYW-2013-10)