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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。
In order to make up for the insufficiency of theoretical research on biaxial tensile strength of masonry structure, taking porous brick masonry as the research object, based on the correspondence between principal stress and plane stress of material, considering the influence of different gully angles and main stress ratio of tension and compression, Emphasis was put on the strength test of macroscopic unit specimen of biaxial tension-compression stress of masonry. The failure characteristics and regularities of the masonry under biaxial tension-compression stress were revealed, and the failure damage behavior of the biaxial tension-compression stress intensity curve and the failure criterion function expression corresponding to the plane stress state were obtained. The experimental results verify the mechanical properties of the anisotropic mechanical properties of masonry structures. The test methods provide reference for the testing of tensile strength of masonry structures. The experimental data provide references for enriching the strength theory of masonry structures. The research results are as follows: Damage guidelines provide the basis.