Analytical model for non-uniform corrosion-induced concrete cracking
Analytical model for non-uniform corrosion-induced concrete cracking
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DOI：
10.1680/jmacr.17.00153
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发表时间：
2018-01-01
影响因子：
2.7
通讯作者：
Li, Chun-Qing
中科院分区：
文献类型：
--
作者：
Yang, Shangtong;Li, Kefei;Li, Chun-Qing
腐蚀开裂是钢筋混凝土结构的主要劣化机理之一，且腐蚀过程沿钢筋圆周沿着不均匀。为了模拟混凝土中的应力分布并确定混凝土开裂的起始，需要开发一个现实的非均匀腐蚀模型。本文首先建立了混凝土产生非均匀膨胀的时间相关腐蚀模型。然后，通过使用复变函数来制定混凝土中的应力。确定混凝土开裂的起始时间，并与许多材料、几何和腐蚀参数相关。通过与文献中报道的实验测试结果进行比较，验证了推导的分析模型。它的结论是，该模型是为数不多的分析模型，可以确定钢筋的不均匀腐蚀引起的混凝土中的应力之一。
Corrosion-induced concrete cracking is one of the major deterioration mechanisms for reinforced concrete structures, and the corrosion process is not uniform along the circumference of the reinforcement. To model the stress distribution in concrete and determine the initiation of concrete cracking, a realistic non-uniform corrosion model needs to be developed. In this paper, a time-dependent corrosion model, producing non-uniform expansion to concrete, is first established. The stresses in concrete are then formulated through the employment of complex functions. The time to initiation of concrete cracking is determined and related to a number of material, geometric and corrosion parameters. The derived analytical model is verified by comparing the results with those from experimental tests reported in the literature. It is concluded that this model is one of very few analytical models that can determine the stresses in concrete caused by non-uniform corrosion of the reinforcement.