钢筋混凝土桥梁的钢筋锈蚀与疲劳耦合损伤

Damage of Steel Bar of Reinforced Concrete Bridge by the Coupling Effect of Corrosion and Fatigue

摘要:

钢筋混凝土桥梁在运营过程中同时承受环境侵蚀作用和荷载疲劳作用，导致承载力衰变.通过对钢筋混凝土梁的钢筋锈蚀损伤和疲劳损伤过程的相互影响分析，建立了钢筋锈蚀与疲劳损伤耦合效应下的钢筋截面综合损伤计算模型.对空心板梁的计算分析表明，锈蚀作用造成钢筋疲劳寿命显著减小.因此，钢筋截面综合损伤计算模型可为钢筋混凝土桥梁结构时变承载力评价提供依据.

关键词:钢筋锈蚀; 疲劳; 耦合效应; 结构损伤; 承载能力

Abstract:

Reinforced concrete bridges withstand both environmental erosions and fatigue loads during operations, resulting in the bridge carrying capacity decay. Through the analysis of the process of steel bar corrosion and fatigue damage, a damage calculation model is set up for evaluation of the comprehensive damage of steel bar’s cross section.Calculation of the hollow plate beam shows that corrosion of steel bar caused a significant reduction in its fatigue life. Therefore, the damage calculation model can provide the basis for the evaluation of the bridge’s time variant load capacity by the coupling effect of both bar corrosion and fatigue damage.

Key words:steel bar corrosion; fatigue damage; coupling effect; structural damage; load capacity