冻融损伤后再生混凝土与钢筋黏结滑移性能梁式试验研究

发布时间：2018-01-19 07:34

本文关键词： 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　出处：《建筑结构学报》2017年04期 　论文类型：期刊论文

【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。
[Abstract]:Through the beam test of 9 groups of specimens, different freeze-thaw cycles, concrete types, recycled concrete strength grade, anchoring length, steel bar diameter as variables. The bond and slip properties of steel bars and recycled concrete after freeze-thaw damage were studied. The results showed that the tensile failure of test bars occurred in each group of specimens, when the number of freeze-thaw cycles was the same. The strength and Anchorage length of recycled concrete have a great influence on the bond properties of rebar and recycled concrete. The bond strength of reinforced slotted specimens decreases by 8.5% after 50 freeze-thaw times and 150 times respectively. 28.3; The fitting formula of bond strength is verified, and the calculated value is in good agreement with the actual value. Finally, the bond stress-slip constitutive relation between rebar and recycled concrete is established, and the calculated values are compared with the experimental values, which are in good agreement with each other.
【作者单位】：内蒙古科技大学土木工程学院;
【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)
【分类号】：TU375
【正文快照】： 0引言钢筋与再生混凝土黏结性能的研究是再生混凝土结构设计的基础。目前,国内外学者对其展开研究,Ajdukiewicz等[1]研究了钢筋表面形状和取代率对黏结强度的影响,认为再生骨料取代率对光圆钢筋和变形钢筋的黏结强度基本没有影响。肖建庄等[2]通过对不同取代率的再生粗骨料混

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