某拱桥拱上立柱牛腿损伤特征分析

Damage Features of Corbels of Reinforced Concrete Columns above One Arc Bridge

桥梁结构混凝土的耐久性与其服役寿命直接相关,而其耐久性往往因混凝土结构使用环境的复杂化和多样化,使混凝土材料并没有所预期的那样耐久。基于寒冷地区某拱桥拱上立柱钢筋混凝土牛腿的损伤特征,分析牛腿混凝土损伤的原因,认为盐冻-荷载-渗水侵蚀的耦合作用是伸缩缝处牛腿混凝土快速损伤、耐久性降低的主要原因。

The service period of a bridge is closely related to its structure concrete durability.In practice,the durability of the concrete is always less than what is expected in design,mainly due to the diversification and complexity of bridge operational environments.Based on the damage features of the corbels of reinforced concrete columns above one arc bridge in cold region,the damage reason is analyzed.The quick damage of the corbels,as well as the degenerated durability,is attributed to the coupling functions of unfavorable stress,deicer-frost and corrosive water from bridge joints.