Analysis On Bearing Capacity Of Corroded Reinforcement Members In Bending

Recent engineering investigations show that there are more and more destruction cases induced by the descent in durability of reinforced concrete structures. And reinforcement rustiness is very common in these cases. So it is a very important assignment to estimate the durability of corroded reinforcement concrete structures. One of the key problems in this work is to develop a computing model for the corroded reinforcement members in coincidence with their stress characters and failure mechanism, which lay foundation for presenting the computing model of bearing capacity. In this paper, a computing model mentioned above is developed, and the attempts that have been done are as follows:Firstly, the existing researches about the descending of bonding capacity and bearing capacity of corroded reinforcement members are summarized in this paper. Based on these research findings, the failure characters of corroded members as well as their failure mechanism are extensively discussed. Simulating experiments about 14 corroded binderless reinforced concrete girders are also preceded to study their bearing capacity influenced by the corrosion. And then, according to the experimental results and finite element computing results, the coordinative performance of bars and concrete is mainly discussed, and the hysteresis of the strain of the bars when corroded heavily is analyzed. With the above method, the relation about strength utilization coefficient and index of reinforcing bars is also presented. At last, a computing model for the corroded reinforcement members is developed and analyzed. Numerical examples show that the present constitutive model is in agreement with the experimental results.