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通过5组锈蚀钢筋再生混凝土中心拉拔试件,研究锈蚀钢筋与再生混凝土黏结性能,分析在钢筋锈蚀率、钢筋直径和混凝土强度等因素影响下,锈蚀钢筋与再生混凝土间黏结应力-滑移的本构关系。得到锈蚀钢筋与再生混凝土间的黏结强度影响因子,获取了锈蚀钢筋与再生混凝土的黏结应力-滑移曲线以及黏结区不同位置处钢筋应变的分布规律。结果表明:锈蚀率较小时,自由端发生滑移,试件仍能承受荷载;锈蚀率较大时,自由端出现微小滑移,试件发生劈裂破坏。为了准确得出相同滑移值下不同锚固位置的黏结应力,先拟合出相应位置处黏结应力与滑移值的关系式,再通过代入滑移值计算得出黏结应力,最后建立考虑位置函数的锈蚀钢筋与再生混凝土的黏结应力-滑移本构关系。并与平均黏结应力进行了对比,结果表明拟合值与试验值吻合较好。
Through five groups of corroded reinforced concrete recycled core specimens, the adhesion between the corroded rebar and the recycled concrete was studied. The influence of the corrosion rate, the diameter of the rebar and the concrete strength on the bond stress-slip between the corroded rebar and recycled concrete Constitutive relations. The influence factors of bond strength between corroded rebar and recycled concrete are obtained, and the bond stress-slip curve of corroded rebar and recycled concrete and the distribution of rebar strain at different positions in the bonded zone are obtained. The results show that when the corrosion rate is small, the free end slips and the specimen can still bear the load. When the corrosion rate is large, the free end slips slightly and the specimen splits and destroys. In order to accurately obtain the bond stress at different anchorage positions with the same slip value, the relation between the bond stress and the slip value at the corresponding position is fitted first, then the bond stress is calculated by substituting the slip value, and finally the position function Bond Stress - Slip Constitutive Relationship of Corroded Reinforced Concrete with Recycled Concrete. Compared with the average bond stress, the results show that the fitting value is in good agreement with the experimental value.