Study on Fatigue Damage Law of Bonding between Steel Strand and Concrete under Corrosive Environment of Chloride

Abstract

In this paper, based on the corrosion of corrosive environment, the characteristics of prestressed concrete structures with bonded steel strand were studied. It can provide a reference for the durability evaluation and design of prestressed concrete structures. The damage characteristics and failure characteristics of concrete and steel strand were analyzed by long-term fatigue loading of corrosion. Pre-stressed concrete bonded specimen forms corrosion fatigue damage, and the static drawing test was carried out. The characteristics of slip curve and the strength of bond strength with corrosion and fatigue were analysed. The fatigue stress and corrosion fatigue strength factors of the bond fatigue all showed exponential decline. By fitting the test results, the prediction model of the bond life with fatigue stress amplitude and corrosion fatigue strength factor is established.