持续荷载与氯离子侵蚀共同作用下钢筋混凝土黏结滑移性能试验研究

Experimental study on bond-slip behavior of reinforced concrete under sustained load and chloride ion erosion

采用梁式试验法对承受持续荷载(25%、45%和65%的极限荷载)作用以及持续荷载与氯离子侵蚀共同作用下钢筋混凝土梁试件的黏结滑移性能进行了研究.研究分析持续荷载和氯离子侵蚀作用对钢筋混凝土间黏结强度、黏结滑移的影响,利用试验数据绘制了滑移量随时间的变化曲线,并建立了相应的函数关系式.试验结果表明:持续荷载和氯离子侵蚀作用后,钢筋混凝土间的黏结强度有不同程度的提高;持续荷载水平越高,钢筋混凝土间的黏结滑移量越大;持续荷载和氯离子侵蚀共同作用下钢筋混凝土间的黏结滑移量比持续荷载单独作用下小.

The bond-slip behavior of reinforced concrete beams subjected to sustained load(25%,45%and 65%ultimate loads)and combined effect of sustained load and chloride ion erosion were studied by beam test method.The effects of sustained load and chloride ion erosion on bond strength and bond slip between the steel bar and concrete were studied;by using the experimental data,the curve of the slip amount with time was drawn,and the corresponding functional relationship was established.The results show that after sustained load and chloride ion erosion,the bond strength between the steel bar and concrete is improved in varying degrees;the higher the level of sustained load,the greater the bond slip between the steel bar and concrete;the bond slip between the steel bar and concrete under the action of sustained load and chloride ion erosion is smaller than that under the action of sustained load alone.