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本文运用FINAL有限元软件,基于钢筋锈胀力,研究混凝土保护层裂缝的形成和发展过程,以及应力分布情况。以二维钢筋混凝土简支梁模型为例,采用以均匀锈蚀为理论基础的锈胀力计算模型,混凝土开裂前选用线弹性本构,开裂后选用双线性软化本构,模拟混凝土由加载初始到破坏的整个过程,得到不同时刻的裂缝图和最大主应力图。通过对试件破坏过程中典型裂缝图和最大主应力图的分析,得出模型为顺筋开裂,初裂位置位于钢筋周围的混凝土中,并逐渐向保护层发展,破坏时锈胀裂缝为张性裂缝,拉应力是裂缝扩展的动力,裂缝形态和应力分布均为漏斗状。文中验证了混凝土保护层发生顺筋锈胀破坏的形态,所得结论为混凝土构件的可靠性、耐久性分析提供了理论依据。
In this paper, FINAL finite element software is used to study the formation and development of cracks in concrete protective layer and the stress distribution based on the corroding force of steel reinforcement. Taking the two-dimensional reinforced concrete simply supported girder model as an example, the calculation model of the corrosive expansion force based on the theory of uniform corrosion is adopted. Before the cracking of concrete, the linear elastic constitutive model is selected. After bracing, the bilinear softening constitutive model is selected. To the destruction of the whole process, get the cracks at different times and the maximum principal stress map. Through the analysis of the typical crack diagram and the maximum principal stress diagram of the specimen during the failure process, the model was found to be the crassinate crack. The location of the initial crack was located in the concrete around the rebars and gradually developed into the protective layer. Tensile stress and tensile stress are the motive force for the crack propagation. The fracture shape and stress distribution are funnel-shaped. The paper verifies the morphology of the concrete protective layer that occurs along the rupture of reinforcement bars. The obtained conclusion provides a theoretical basis for the reliability and durability analysis of the concrete components.