砌体结构双轴拉压应力强度试验研究

为弥补砌体结构双轴拉压应力强度理论研究的不足，以多孔砖砌体为研究对象，基于材料主应力与平面应力的对应关系，考虑不同灰缝角度及拉压主应力比的影响，重点开展了砌体双轴拉压应力宏观单元试件的强度试验。从中揭示了砌体双轴拉压应力状态下的破坏特征与规律，分析得出双轴拉压应力强度破坏曲线及对应平面应力状态的强度破坏准则函数表达式。试验结果验证了砌体结构材料各向异性的力学特性，试验方法为砌体结构抗拉强度的测试提供借鉴，试验数据为丰富砌体结构强度理论提供参考，研究成果为建立完善的砌体结构破坏准则提供依据。

EXPERIMENTAL RESEARCH ON MASONRY STRUCTURE STRENGTH UNDER BIAXIAL TENSILE-COMPRESSIVE STRESS

To investigate the strength theory of masonry structure under biaxial tensile-compressive stress, several kinds of biaxial mechanics performance tests were carried out with consideration of different mortar joint angles and the corresponding relationships between principal stresses and plane stresses of perforated brick masonry. The damage characteristics of masonry structure under biaxial tension-compression are revealed, and the corresponding strength curves have been obtained to establish the plane stress failure criterion. The experimental results verify the anisotropic properties of masonry structure, and the experimental methods could be applied in other tensile strength tests of masonry structure. The tests data and the research results provide reference to improve the strength theory and failure criterion of masonry structure.