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本文对定侧压情况下混凝土二轴受压的变形特性进行了试验研究,在单调加载和重复加载的过程中量测了试件的应力-应变关系曲线.通过与比例加载试验结果的对比和分析,明确了混凝土的应变值因应力途径的不同而有很大差异的结论,给出了定侧压情况下混凝土应力-应变关系的计算式.还发现了在定侧压情况下、重复加载时试件恒压方向的残余应变与再加载应变符号相反等现象.
In this paper, the deformation characteristics of concrete under the condition of constant lateral pressure under biaxial compression are studied experimentally. The stress-strain curve of the specimen is measured during monotonous loading and repeated loading. The analysis shows that the strain value of concrete varies greatly due to different stress pathways. The calculation formula of the stress-strain relationship of concrete under constant lateral pressure is given. It is also found that under the condition of constant lateral pressure, repeated loading At the same time, the residual strain in the direction of constant pressure and the sign of reloading strain are opposite.