摘要
通过9组试件的梁式试验,以不同冻融循环次数、混凝土类型、再生混凝土强度等级、锚固长度、钢筋直径为变量,研究冻融损伤后钢筋与再生混凝土间的黏结滑移性能。结果表明:各组试件均发生了测试钢筋的拔出破坏,当冻融循环次数相同时,再生混凝土强度和锚固长度对钢筋与再生混凝土的黏结性能影响较大,其中钢筋开槽组试件冻融50次和150次后,其黏结强度分别降低8.5%、28.3%;对黏结强度的拟合公式进行验证,计算值与实际值吻合较好;最后建立了钢筋与再生混凝土的黏结应力-滑移本构关系,并将计算值与试验值进行对比,二者吻合较好。
Bond behavior between recycled concrete and steel bar after freeze-thaw damage was analyzed by nine groups of beam-type tests. Numbers of freeze-thaw cycles, concrete types, strength grade of recycled concrete, anchorage length and bar diameter were selected as the parameters in this experiment. It is shown that all specimens suffer the pulled-out failure. In the same times of freeze-thaw, strength of recycled concrete and anchorage length have a great influence on bond behavior between recycled concrete and steel bar. For specimens with slotted reinforcement, the bond strength is reduced by 8.5% after 50 times of freeze-thaw cycles and it is reduced by 28.3% after 150 times of freeze-thaw cycles. The theoretical fitted formula of bond strength is verified with experiments, and calculated values agree well with experimental ones. Bond stress-slip constitutive relation between steel and recycled concrete was established. The calculated values are compared with the experimental values, and both are in good agreement.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2017年第4期141-148,共8页
Journal of Building Structures
基金
内蒙古自然科学基金项目(2014MS0551
2016MS0547)
内蒙古自治区高等学校科学研究项目(NJZY159)
包头市科技计划项目(2014X1009)
关键词
再生混凝土
冻融循环
黏结滑移
梁式试验
极限黏结应力
本构关系
recycled concrete
freeze-thaw cycle
bonding slip
beam-type test
ultimate bond stress
constitutive relation
