钢筋混凝土梁锈胀开裂计算研究

Research on the Calculation of Corrosion Expansion and Cracking of Reinforced Concrete Beams

【目的】钢筋锈蚀引起的钢筋混凝土构件锈胀开裂是混凝土结构退化的重要原因,有必要对锈胀裂缝机理进行探究。【方法】基于人工通电锈蚀试验对钢筋混凝土梁进行锈胀开裂计算,通过计算锈蚀钢筋混凝土梁锈胀开裂锈蚀深度,从而得到锈胀裂缝宽度值。【结果】研究结果表明,考虑电流腐蚀密度与电解液浓度的锈胀裂缝计算公式能有效预测钢筋混凝土梁的锈胀开裂宽度。【结论】钢筋混凝土梁的锈胀开裂机理十分复杂,裂缝宽度受到的影响较多,结合电流腐蚀密度与电解液浓度所修正的裂缝计算公式为裂缝研究提供了一种有效的思路。

[Purposes]The corrosion cracking of reinforced concrete members caused by steel corrosion is an important factor in the degradation of concrete structures.Therefore,it is necessary to explore the mechanism of corrosion cracking.[Methods]Based on the artificial electrification corrosion test,the cor⁃rosion expansion cracking calculation of reinforced concrete beams was carried out,and the corrosion ex⁃pansion cracking corrosion depth of corroded reinforced concrete beams was calculated to obtain the cor⁃rosion expansion crack width value.[Findings]The research results indicate that the calculation formula for rust-induced crack width,considering the corrosion current density and electrolyte concentration,can effectively predict the width of rust-induced cracks in reinforced concrete beams.[Conclusions]The mechanism of rust-induced crack expansion in reinforced concrete beams is highly complex,and the crack width is influenced by various factors.The crack calculation formula modified based on the cor⁃rosion current density and electrolyte concentration provides an effective approach for crack research.