摘要
通过66个双轴受压强度试验,分析混凝土注芯砌块砌体双轴受压破坏面特点,利用应力比和异化参数建立破坏曲面函数;并得到强度分别随应力比及异化参数的变化规律。研究结果表明单轴受压时砌块砌体各向异性表现最明显,由异化参数变化而引起强度降低最大达到40%;而随横向应力的出现这种强度的差异逐渐弱化;最后在等压应力状态下蜕化成各向同性材料。不同宏单元体的强度随应力比呈凸向上的抛物线型分布,都是在单轴受压时取得强度最小值;在应力比α=0.6左右取得最大值。研究结果为理论分析及结构设计提供参考。
Biaxial compressive experiment on 66 specimens of grouted concrete block masonry （GCBM） was conducted for different principal stress ratio and specimen type. The characteristics of failure surface on biaxial compression were analyzed and the function of failure surface was presented in terms of stress ratio and heterogeneity index. Furthermore, the laws of strength to stress ratio and heterogeneity index were achieved, respectively. The experimental research results are as following, the anisotropy of GCBM expresses very strong under the uniaxial compression state. And the difference of specimens＇ strength is over 40%. The difference lowers gradually with the existence of lateral restraining stress and diminishes in the equal biaxial compression condition. The relationship between strength to stress ratio is distributed like convex parabola shape and the maximum compressive strength occurs in the range of stress ratio a = 0.6. And the minimum value does under uniaxial compression. The results can provide information to other research analysis and structure design.
出处
《华中科技大学学报（城市科学版）》
CAS
2009年第3期18-22,28,共6页
Journal of Huazhong University of Science and Technology
基金
国家自然科学基金(50608024
90815014)
哈尔滨工业大学交通科学与工程学院创新与发展基金
