大连理工大学学报2016，Vol.56Issue(6)：608-615,8.DOI:10.7511/dllgxb201606008
混凝土握裹层径向压力对带肋钢筋黏结性能影响试验研究
Experimental study of radial pressure of concrete cover on bond behavior of ribbed steel bars
摘要
Abstract
Bond behavior between concrete and ribbed steel bars is governed by interlocking force between concrete and transverse ribs.The radial pressure of concrete cover is an essential condition that studies the interaction between the transverse ribs of ribbed steel bars and concrete.Pull-out tests were carried out to measure the radial pressure of ribbed steel bars acted by concrete cover for the case of splitting bond failure.In this test two micro-load transducers embedded in the grooved steel bar were positioned to measure the radial pressure of concrete cover.The pull-out tests of a total of six specimens were conducted to obtain the confinement with different cover thicknesses.In the experiment,it is found that during the process of splitting bond failure the effective rib face angle gradually decreases and the bond stress is directly proportional to the radial pressure of concrete cover. When approaching to the splitting bond failure, the effective rib face angle is inversely proportional to the thickness of concrete cover.The distribution of bond stress along anchorage length of steel bar is influenced by the thickness of concrete cover.The appropriate thickness of concrete cover will lead to a uniform distribution of bond stress.Additionally,the maximum radial pressure of concrete cover measured experimentally is in good agreement with that predicted by thick-wall cylinder model,which takes the cohesive force of cracks into account.关键词
带肋钢筋/混凝土握裹层/约束作用/劈裂破坏/机械咬合作用Key words
ribbed steel bars/concrete cover/confinement/splitting bond failure/mechanical interaction分类
建筑与水利引用本文复制引用
王立成,李龙龙,梁永钦..混凝土握裹层径向压力对带肋钢筋黏结性能影响试验研究[J].大连理工大学学报,2016,56(6):608-615,8.基金项目
"九七三"国家重点基础研究发展计划资助项目(2015CB057703) （2015CB057703）
国家自然科学基金资助项目(51378090). （51378090）
