【摘要】 为适应推广应用轻骨料砼的需要，本文利用自制的砼多轴试验装置，对国内尚未研究，国外也较少开展的轻骨料砼在双轴压及拉压应力组合下的变形和强度特性进行了试验研究，分析了应力一应变关系的特点。并与普通砼的特性进行了比较，在分析试验资料的基础上，建议了轻骨料砼在主应力空间及八面体应力空间表述的强度准则和以峰值应力点的应变与应力比α的关系表述的强度准则。本文的工作为复杂应力状态下轻骨料砼结构的设计提供了经济可靠的设计依据。更多还原

【Abstract】 Using the concrete multiaxial test apparatus developed by the authors, the deformation and strength of lightweight concrete under biaxial compression stresses and tension--compression stresses are studied experimentally. The characterstics of the stress-strain relationship of ligh tweight concrete are analyzed and compared with those of ordinary concrete. Based on the test data, the strength criteria expressed in terms of principal stresses, octahedral stresses as well as principal strain corresponding to ultimate stress and stress ratio respectively are proposed. These models are essential to economical and reliable design of lightweight concrete structures under complex stress conditions.更多还原