| Transportation infrastructure is the foundation of the national economic and social development,the bridge is the key to ensure the normal operation of traffic.Bridge structure is subjected to different external loads and environments in the long run,which cause different types and degrees of damage,so it need to be reinforced for normal use or extend its service life.However,the reinforced bridge structure is still subjected to vehicle load and environmental erosion.The durability deterioration and fatigue life of reinforced structures need to be widely concerned.Therefore,the research on the fatigue property of the bridge structure reinforcement model under the environment erosion has important practical significance for ensure the safe operation of the bridge and prolong the service life of the reinforced bridge.The paper has systematically researched the durability and fatigue property under carbonation and freeze-thaw cycle of the fatigue damage large-scale prestressed hollow slab which has been reinforced by CFRP and steel plate,the main work is as follows:(1)The static and dynamic load tests have been carried out on two kinds of strengthening methods of CFRP and steel plate,and the reinforcement effect of two kinds of strengthening methods was analyzed.(2)The fatigue test was carried out for the different strengthening methods and different environmental degradation of the test plate.(3)The deflection、strain、dynamic displacement、fundamental frequency and damping of the reinforced hollow slab have been summarized during the fatigue process,the durability decline mechanism about the reinforced hollow slab has been revealed.(4)The same reinforcement method under different environmental erosion and different reinforcement methods under the same environment of reinforced components fatigue property has comparatively analyzed.(5)The relationship between fatigue times and deflection variation of the reinforced components under environmental erosion has been analyzed.The related relationship between fatigue times and deflection growth coefficient has been obtained.The research on the fatigue property of the reinforced bridge structure model under environmental erosion can provide some theoretical support for the determination of the reinforcement scheme 、recognize the mechanism of durability deterioration of reinforced components、the inspection and evaluation of reinforced bridge,the research findings are valuable for life prediction of the reinforced bridge structure. |
