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为了克服传统弥散裂缝模型的不足,采用应变分解的方法,推导了钢筋混凝土单元的开裂模型;通过假定裂缝面法向和切向变形解耦,采用混凝土非线性断裂力学的基本理论分别构造裂缝面法向和切向的本构关系;对于混凝土单元中的钢筋,在开裂后不仅考虑其轴向刚度,同时采用弹性地基梁模型考虑其横向作用对开裂混凝土应力传递的影响;采用FORTRAN语言编制程序,通过与经典梁、板构件试验结果的比较,表明该模型的合理性和有效性;可用于钢筋混凝土结构非线性和极限承载力的分析。
In order to overcome the shortcomings of the traditional diffusion crack model, the cracking model of reinforced concrete unit is deduced by using the method of strain decomposition. Based on the assumption of the normal and tangential deformation of the fracture surface, the basic theory of nonlinear fracture mechanics of concrete is used to construct the fracture surface Normal and tangential constitutive relations. For the steel bars in concrete elements, not only the axial stiffness is considered after cracking, but the elastic foundation beam model is also adopted to consider the effect of lateral effect on the stress transmission of cracked concrete. The program is compiled by FORTRAN The results show that this model is reasonable and valid by comparison with the experimental results of classical beams and slabs. It can be used to analyze the nonlinear and ultimate bearing capacity of reinforced concrete structures.