Abstract

Info

Author(s):: YANG Ou; ZHANG Xiao-fei; HUO Jing-si; CHEN Jun; Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education, Hunan University

Keywords:: prestressed concrete beam; constant-amplitude fatigue; variable-amplitude fatigue; fatigue performance; corrosion

Abstract:: The research progress of fatigue performance of prestressed concrete beams was summarized in detail. The fatigue performance under constant-amplitude fatigue loading and static behavior after fatigue loading of prestressed concrete beams were discussed. The influence factors controlling the fatigue failure pattern, the strain variation of forced steel bars, the development of cracks and the variation of deflection during fatigue loading were summarized. The fatigue life of prestressed concrete beams under variable-amplitude fatigue loading and the influences of loading sequence on fatigue life were discussed, and the stiffness degradation in the process of variable-amplitude fatigue loading was analyzed. The fatigue performance of corroded prestressed concrete beam was analyzed. The influences of corrosion damage of steel strand and common steel bar on the fatigue failure pattern, ultimate bearing capacity and fatigue life of the test beam were summarized. Based on the summary and analysis of the literatures, the research direction of fatigue performance of prestressed concrete structures was put forward considering the existing problems of the current research. The results show that the fatigue failure of prestressed concrete beams starts with the fatigue fracture of the tendons, and the concrete in compression zone generally does not break. Variable-amplitude fatigue loading and corrosion damage have great influence on fatigue performance.