Experimental Study On Fatigue Behavior Of Concrete Beams Under The Effect Of Corrosion And Fatigue

Reinforced concrete has been widely used in civil and military engineering due to the superior performance and low cost.With the large number of applications of this material,its durability problems have become increasingly serious.Among them,the corrosion of steel bars caused by chloride ions in corrosive environments poses the most serious structural damage.These structures are subjected to the complex effects of fatigue loads such as vehicle loads,which often lead to the decrease of structure durability.In this paper,the reinforced concrete beams were studied under the corrosive environment and fatigue loads.The fatigue properties of the tested beams under the effects of corrosion and fatigue,such as failure form,fatigue life,and deflection development were analyzed.The prediction formula of fatigue life of reinforced concrete beams was fitted out based on the stiffness degradation.The first chapter mainly introduces the background and significance of this subject,and summarizes the domestic and international research on the fatigue performance of reinforced concrete members under the effect of corrosion and fatigue.The main research contents of this paper are put forward based on the existing related research results.The second chapter introduces the test design of this paper in detail,including the information of the tested beams,laboratory corrosion method,laboratory loading device,data acquisition method and measurement point arrangement.The third chapter mainly analyze the test results.The corrosion fatigue process and the failure form of the tested beams are analyzed in detail,and the fatigue properties such as the fatigue life,deflection development and crack propagation are studied.The results show that the load level has an important influence on the fatigue life,and the corrosion environment can seriously reduce the fatigue life.In the fourth chapter,a prediction model for the fatigue life of the test beam is fitted out based on the changes of the stiffness of the tested beam.The prediction results agree well with the experimental results.The fifth chapter makes a comprehensive summary of the research in this paper,and puts forward suggestions for the future research of reinforced concrete beams under the effects of corrosion and fatigue loads...