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本文对364个棱柱体混凝土试件进行了拉压二轴受力试验研究.试验共采用了3种加载途径.根据试验结果,分析了拉压二轴强度、应力应变关系、最大应力处应变及不连继点处应变等随应力比的变化规律以及水灰比、粗骨料品种和加载途径对拉压二轴强度的影响;观察了试件的破坏形态;得到了拉压二轴受力下混凝土可用第二强度理论描述的结论并给出了拉压二轴强度计算公式.
In this paper, 364 prismatic concrete specimens were subjected to tensile and compressive biaxial stress tests. Three kinds of loading methods were used in the test. Based on the test results, the two-axis tensile and compressive strength, stress-strain relationship, strain at the maximum stress, and strain were analyzed. The influence of the strain ratio on the strain ratio at the following point, the ratio of water to cement, the type of coarse aggregate, and the loading route on the tensile strength of the two-axis tension; the failure morphology of the specimen was observed; and the tension and compression on the two axes were obtained. The conclusion that the concrete can be described by the second strength theory is given and the formulae for calculating the two-axis strength of tension and compression are given.