钢纤维高强陶粒混凝土与钢筋的粘结性能试验研究  

Experimental research on bond behavior between steel fiber reinforced high-strength ceramsite concrete and rebar

作　　者：张欢欢[1] 吕振利[1] 刘阳 

机构地区：[1]华侨大学土木工程学院,厦门361021 [2]福建省结构工程与防灾重点实验室,厦门361021

出　　处：《建筑结构》2016年第4期79-84,共6页Building Structure

基　　金：泉州市科技计划项目(2013Z30);福建省自然科学基金(2012J01220);华侨大学科研基金资助项目(12BS130)

摘　　要：主要通过42个局部粘结的中心拔出试验,研究不同钢纤维体积率、不同钢筋直径和不同钢纤维长径比对钢纤维高强陶粒混凝土与钢筋粘结性能的影响;用能量吸收和等效粘结强度评价了钢纤维高强陶粒混凝土与钢筋之间的粘结韧性。试验结果表明:不掺钢纤维的高强陶粒混凝土的破坏形式为劈裂破坏,掺钢纤维的高强陶粒混凝土的破坏形式为钢筋拔出破坏;在其他条件相同的情况下,钢纤维掺量越高其极限粘结强度越高(相对于不掺钢纤维的陶粒混凝土,钢纤维体积率为0.5%,1%,1.5%时,其极限粘结强度分别提高了6.7%,13.4%,18.6%);直径为22mm的钢筋的极限粘结强度比直径为16mm的钢筋的极限粘结强度低12.3%。The axial pullout tests of 42 partly-bonded specimens were carried out to study influences of different steel fiber contents,rebar diameters and length to diameter ratios of steel fiber on bond property between steel fiber reinforced high-strength ceramsite concrete and rebar. The bond toughness between steel fiber reinforced high-strength ceramsite concrete and rebar was evaluated by energy absorption and equivalent bond strength. The test results show that the high-strength ceramsite concrete specimens without steel fiber suffer from splitting failure,and the high-strength ceramsite concrete specimens with steel fiber suffer from rebar pull-out failure. The ultimate bond strength is enhanced with the increase of steel fiber content when other conditions are the same,and the ultimate bond strengths are increased by 6. 7%,13. 4%,18. 6% under the steel fiber content of 0. 5%,1%,1. 5% respectively compared with the ceramsite concrete without steel fiber. The ultimate bond strength of rebar with diameter of 22 mm is 12. 3% lower than that of 16 mm diameter rebar.

关 键 词：钢纤维 高强陶粒混凝土 粘结性能 滑移 

分 类 号：TU528.572[建筑科学—建筑技术科学]