Experimental study on bond performance between rubber concrete and deformed steel bar
A total of 9 groups of specimens were designed and made,and the pull-out test on the specimen with sticking strain gauge on the steel bar was carried out.The effects of rubber volume substitution rate,steel bar diameter and anchorage length on the bonding performance between deformed steel bar and rubber concrete were systematically studied.The failure modes of the specimens were observed and the ultimate bond stress and slip of the specimens were calculated.The distribution of bond stress,relative slip and bond stress-slip curves at different anchorage positions were obtained under different factors.A constitutive model of bond stress-slip relationship between deformed steel bar and rubber concrete considering rubber volume substitution ratio was established.By dimensionless treatment of bond stress at different locations(distance from free end)with the same slip value,the bond position function between deformed steel bar and rubber concrete with different rubber volume substitution ratios was obtained.The results show that the ultimate bonding stress decreases with the increase of rubber volume substitution ratio and the corresponding slip at loading end increases first and then decreases.Increasing the diameter of steel bar and the length of anchorage will reduce the ultimate bond stress and the corresponding slip at loading end.Comparing the bond stress-slip curves at different locations,it is found that the uneven distribution of bond stress will be aggravated by the increase of rubber volume substitution ratio,the increase of steel bar diameter and anchorage length.Relative slip increases with the increase of rubber volume substitution rate and decreases with the increase of steel bar diameter and anchorage length.
deformed steel barrubber concretebond performancebond stress-slip constitutive relationposition function
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万方数据
维普
