Fatigue properties of polyurethane concrete expansion joint anchorage zone

For the study of the applicability of polyurethane concrete (PUC) in the anchorage zone of expansion joints, the construction process of PUC was summarized through the on -site construction of the anchorage zone of bridge expansion joints. The mechanical response of anchorage zones with different materials under vehicle loading was also analyzed by finite element modeling. The linear fatigue cumulative damage of expansion joint anchorage zone materials PUC, steel fiber concrete (SFC), and silicate cement concrete (PCC) were analyzed respectively by traffic investigation of bridge sections under construction and Miner's linear fatigue damage accumulation theory. The results show that the vertical displacement of PUC is 13 times that of SFC and PCC, the stress is reduced by 36%, and the annual cumulative fatigue damage value of PUC is 1.06E-07, which is only 1/10 of that of SFC, and PUC has excellent load cushioning capacity and fatigue performance, which can effectively improve the service life of the anchorage zone of expansion joints.