带肋钢筋与灌浆料黏结性能试验

发布时间：2018-03-22 01:27

本文选题：灌浆料　切入点：带肋钢筋　出处：《哈尔滨工业大学学报》2017年12期 　论文类型：期刊论文

【摘要】：为灌浆料在预制装配式结构及加固改造领域提供理论依据,进行了27个带肋钢筋-灌浆料拉拔试验,研究了试件的破坏模式和黏结强度随变量的变化规律,分析了灌浆料开裂、压碎过程及与过程相对应的典型黏结-滑移曲线各阶段.基于试验数据,拟合了灌浆料黏结锚固强度公式、黏结强度对应的滑移值公式和黏结应力-滑移关系式,提出了钢筋在灌浆料中的锚固长度经验值.结果表明:随着保护层厚度增大,试件平均黏结强度不断增大,相比于混凝土,保护层厚度增大相同幅度,灌浆料黏结强度增长慢;随着钢筋直径增大,平均黏结强度减小;随着钢筋锚固长度增加,试件平均黏结强度降低,相比于自密实混凝土,锚固长度增加相同幅度,灌浆料黏结强度增长快;强度等级相同时,灌浆料黏结强度高于普通混凝土;钢筋与灌浆料间黏结性能和钢筋与混凝土间黏结性能有差异.
[Abstract]:In order to provide theoretical basis for grouting materials in the field of prefabricated structure and reinforcement and transformation, the drawing tests of 27 ribbed steel bars and grouting materials were carried out. The failure mode and bond strength of the specimens varied with variables, and the cracking of grouting materials was analyzed. On the basis of the experimental data, the formula of anchoring strength of grouting material, the slip value formula of bond strength and the relationship between stress and slip are fitted. The results show that with the increase of the thickness of the protective layer, the average bond strength of the specimen increases continuously. Compared with the concrete, the thickness of the protective layer increases by the same amplitude, and the bond strength of the grouting material increases slowly. With the increase of reinforcing bar diameter, the average bond strength decreases, and with the increase of reinforcement Anchorage length, the average bond strength decreases. Compared with self-compacting concrete, the Anchorage length increases by the same amplitude, and the bond strength of grouting material increases rapidly. When the strength grade is the same, the bond strength of the grouting material is higher than that of the ordinary concrete, and the bond properties between the steel bar and the grouting material and the bond property between the steel bar and the concrete are different.
【作者单位】：同济大学结构工程与防灾研究所;
【分类号】：TU528

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