徐世烺, 王利民, 赵艳华. 准脆性材料裂纹桥联筋的应力与变形[J]. 工程力学, 2002, 19(3): 132-136.
引用本文: 徐世烺, 王利民, 赵艳华. 准脆性材料裂纹桥联筋的应力与变形[J]. 工程力学, 2002, 19(3): 132-136.
XU Shi-lang, WANG Li-min, ZHAO Yan-hua. THE STRESS AND DEFORMATION OF bridge BAR OF QUASI-BRITTLE MATERIAL CRACK[J]. Engineering Mechanics, 2002, 19(3): 132-136.
Citation: XU Shi-lang, WANG Li-min, ZHAO Yan-hua. THE STRESS AND DEFORMATION OF bridge BAR OF QUASI-BRITTLE MATERIAL CRACK[J]. Engineering Mechanics, 2002, 19(3): 132-136.

准脆性材料裂纹桥联筋的应力与变形

THE STRESS AND DEFORMATION OF bridge BAR OF QUASI-BRITTLE MATERIAL CRACK

  • 摘要: 基于钢筋混凝土的破坏分析,结合混凝土类准脆性材料的断裂特性,本文提出了强化筋桥联基体裂纹力学分析模型,在该虚拟裂纹端部存在粘聚力分布,而强化筋在桥联裂纹处具有与基体脱离的部分段.由变形体的叠加原理和协调性条件,通过断裂力学的应力函数分析方法,推导出了在远场载荷作用下,离裂纹端部较远处桥联筋的轴向受力和变形,与脱粘筋长度之间的函数关系.文中分别就基体和强化筋材料为完全弹性,裂纹端部存在粘聚力,和强化筋为弹塑性材料等不同情况时,对裂纹和强化筋的变形和受力进行了算例分析和讨论.

     

    Abstract: Based on the failure analysis of reinforced concrete and the fracture behavior of concrete as a type of quasi-brittle materials, a model of matrix crack with bridging bar is proposed in this paper. In the quasi-brittle matrix, there is a cohesive distribution force near the fictitious crack tip, and some part of the bar is separated from the matrix near the crack. According to the superposition principle and compatibility condition of deformation solid, the relationship between the stress or deformation of bar and bar's length separated from matrix under a defined far-field load is deduced by means of stress function analysis method of fracture mechanics. Numerical examples are presented and discussions are conducted for the following situations: the matrix and bar are different ideal elastic materials; a cohesive distribution force is close to crack tip; and the bar is made of elastic-plastic material.

     

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