建筑结构学报2025，Vol.46Issue(5)：172-185,14.DOI:10.14006/j.jzjgxb.2024.0298
钢管地聚物再生混凝土界面黏结-滑移性能试验研究
Experimental investigation on interfacial bond-slip behavior of geopolymer recycled aggregate concrete-filled steel tube
摘要
Abstract
To study the interfacial bond behavior of geopolymer recycled aggregate concrete-filled steel tube(GRACFST),taking the diameter-to-thickness ratio(D/t,28.50、32.57、38.00、45.60),recycled aggregate(RA)replacement rate(25％,50％,75％,100％),and concrete strength grade(C30,C40,C50)as variable parameters,10 groups of GRACFST short columns were designed.Additionally,one group of concrete-filled steel tube short column and one group of recycled aggregate concrete-filled steel tube short column as controls were set up.The static push-out tests on these columns were conducted.The whole failure process and final failure modes of specimens were investigated,and the load-slip curves,strain distribution,bond failure mechanism and variation regularities of bond strength were analyzed.The results show that the D/t has the most significant influence on the shapes of load-slip curves.The steel tube longitudinal strain of GRACFST specimens mainly presents a three-stage distribution at the load-increasing stage and finally shows a linear distribution at the load-declining stage.The interfacial bond strength of GRACFST decreases with the increases of D/t and concrete strength grade.The addition of RA can improve the interfacial bond strength of GRACFST to various degrees.As the RA replacement ratio increases from 0％to 25％,50％,75％and 100％,the bond strength of GRACFST increases by 28.97％,32.34％,11.96％and 0.93％,respectively,but it is generally lower than that of RACFST.According to the test results,the calculation formula for the interfacial bond strength of GRACFST and corresponding bond-slip constitutive model were proposed.The predicted results of the model agree well with the experimental results.The maximum relative error is 15％.The mean value and standard deviation of the ratio between the calculated values and the experimental values are 1.009 and 0.099,respectively.关键词
钢管混凝土/地聚物再生混凝土/推出试验/黏结失效机理/黏结强度/黏结-滑移本构模型Key words
concrete-filled steel tube/geopolymer recycled aggregate concrete/push-out test/bond failure mechanism/bond strength/bond-slip constitutive model分类
建筑与水利引用本文复制引用
李彪,王成龙,李扬,胡军安,吴峰,陈志康..钢管地聚物再生混凝土界面黏结-滑移性能试验研究[J].建筑结构学报,2025,46(5):172-185,14.基金项目
国家自然科学基金项目(52308248),湖北省自然科学基金项目(2023AFB309),湖北工业大学科研启动基金项目(XJ20220000401). （52308248）
