不同侧向应力作用下轻骨料混凝土力学性能研究

Mechanical properties of lightweight aggregate concrete under different lateral stresses

从轻骨料混凝土双轴受力状态和粘结性能2个角度出发,研究不同侧向应力作用下轻骨料混凝土的力学性能。结果表明:双轴压-压工况下,侧向应力较大或较小时,试件呈现劈裂或剪切破坏形态,峰值应变绝对值随侧向应力增加而减小;双轴拉-压工况下,无论侧向应力为何值,试件均呈现劈拉破坏形态,峰值应变随侧向压力增加而减小;粘结滑移曲线在不同侧向拉力时,升高段和降低段呈现非同种特性,平均粘结强度随侧向拉力均值的增加而降低。基于Kupfer提出轻骨料混凝土双轴力学性能新破坏准则,可以良好描述轻骨料混凝土在侧向应力作用下的破坏规律。

The mechanical properties of lightweight aggregate concrete under different lateral stresses are studied from the two aspects of biaxial stress state and bonding performance.The results show that under biaxial compression-compression condition,when the lateral stress is large or small,the specimens show splitting or shear failure mode,and the absolute value of peak strain decreases with the increase of lateral stress;under biaxial tension-compression condition,the specimens show splitting failure mode regardless of the value of lateral stress,and the peak strain decreases with the increase of lateral pressure.When the force is applied,the rising and decreasing segments show different characteristics,and the relative bond strength decreases with the increase of the mean lateral tensile force.Based on Kupfer’s new failure criterion for biaxial mechanical properties of lightweight aggregate concrete,the failure law of lightweight aggregate concrete under lateral stress can be well described.