Experiment Research On Fatigue Property Of Hollow Slab With Chlorideion Corrosion

In recent years, the transportation has rapidly developed in china.By 2015, the total mileage of highway has exceeded 4 million 600 thousand km. As an important part of the traffic construction, the bridge safety is very important.However, the damage of the bridge structure is accelerated by the unfavorable environment such as chloride ion, freeze-thaw cycle and carbonation corrosion. The safety problem of the bridge caused by the durability problem is becoming more and more serious.The reaserch has not fully consider the relationship between the durability damage and the fatigue characteristics of the bridge, so the relationship between damage degree of durability and fatigue characteristics based on the bridge structure is an important issue.In this paper, the durability and fatigue behavior of prestressed concrete hollow under the action of chloride ion erosion are studied. The main work is as follows:(1)The effect of chlorideion erosion on the mechanical properties of cement concrete was studied by testing the mechanical properties of the same period of concrete block of different levels with chlorideion erosion.(2)By testing the fatigue behavior of the plate under different degree of chlorideion erosion, the stress, strain, deflection, fundamental frequency and damping of the plate are summarized.(3)The relationship between the deflection change and the fatigue number under the fatigue load was analyzed, and the relationship between the deflection increasing coefficient and the fatigue number was obtained.The study of bridge structure durability under adverse environment for practical engineering detection, evaluation, prediction and reinforcement of life has important significance,the research result has a certain reference value to improve the durability of bridge reinforcement and life prediction.