Experimental study on bond behavior of corroded reinforcements in concrete under reversed cyclic loading
Corrosion of reinforcement and reversed cyclic loading will cause degradation of the bond performance between steel bars and concrete,which will affect the bearing capacity of reinforced concrete structures during service.Accelerated corrosion tests and reversed cyclic loading tests were carried out on 16 reinforced concrete eccentric pull-out specimens.The experimental phenomena such as corrosion morphology of reinforcement,corrosion cracking of cover and loading splitting were analyzed.The influence laws of the corrosion degree of the longitudinal reinforcement and stirrup,cover thickness and stirrup spacing on the hysteretic behavior of the interface were also studied.The test results show that in an accelerated corrosion test,the reinforcement undergoes uneven corrosion and the concrete cover undergoes complex cracking.In the reversed cyclic loading test,each hysteresis parameter degrades obviously under the controlled slip corresponding to the peak bond stress.The slight corrosion of longitudinal reinforcements and stirrups(corrosion level less than 2.44％)can improve the interfacial bond performance and the peak bond stress to a certain extent,but after severe corrosion,all bond characteristic parameters decrease significantly.With the increase of the cover thickness and the decrease of the stirrup spacing,the peak bond stress increases by about 34.76％and 11.60％,respectively.Finally,based on the existing research and experimental data,a bond stress-slip hysteresis model was established through regression analysis,which can accurately predict the test results.
reinforced concretecorrosionreversed cyclic loading testbond behaviorhysteresis model
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