环境作用与疲劳荷载藕合下混凝土结构性能劣化行为

混凝土结构往往需要承受疲劳荷载的作用,进而引起结构的疲劳损伤及脆性破坏;同时,混凝土结构还可能承受腐蚀、高（低）温、冻融循环等环境作用,并由此引起结构的环境损伤;当疲劳荷载与环境作用相互耦合时,结构性能会加速劣化,从而导致结构过早发生脆性破坏.该文分析多种环境作用与疲劳荷载耦合下混凝土结构性能劣化的机制,介绍有关研究现状,提出需要进一步解决的问题.

Study on Degradation of Reinforced Concrete Structures Under Coupling of Environmental Action and Fatigue Load

Fatigue damage and brittle failure of concrete structures is the result of fatigue loading, moreover, concrete structures may also be subject to corrosion, high or low temperature, freeze-thaw cycles and other environmental actions, which result in environmental damage. When the fatigue load is coupled with environmental actions, the deterioration of structural performance will be accelerated, which leads to premature brittle failure. In this paper, the deteriorating mechanism of concrete structure performance under coupling of environmental action and fatigue load is analyzed. The status quo of concerned researches is introduced and some further questions are put forward, too.