摘要
针对普通钢筋混凝土耐久性不足的问题,提出FRP筋与UHPC组成新型结构,而前提是两者具有良好的粘结性能,以便在荷载作用下能同时受力。基于此,以钢筋类型、表面处理形式及直径为变量,制作了4组中心拉拔试件,通过室内试验来验证GFRP筋与UHPC的粘结性能及其影响因素。结果表明:GFRP筋与普通钢筋都具有类似的粘结滑移曲线特征;同条件下,普通钢筋与UHPC的粘结性能相比于GFRP筋更好,且在产生相同粘结应力的情况下,普通钢筋的滑移量要更小;表面带肋的GFRP筋与UHPC的粘结性能相比于普通混凝土更加优异;钢筋直径越大,极限粘结应力缓慢下降,而极限荷载逐步增加。
In view of the lack of durability of ordinary reinforced concrete,a new structure composed of FRP bars and UHPC is proposed,and the premise is that they have good bonding properties,so that they can be stressed simultaneously under load.Based on this,4 groups of central drawing specimens were made with the type,surface treatment and diameter of the rebar as variables,and the bonding properties and influencing factors of GFRP bars and UHPC were verified through laboratory tests.The results show that GFRP bars and ordinary bars have similar bond slip curve characteristics.Under the same conditions,the bonding property of ordinary steel bars and UHPC bars is better than that of GFRP bars,and the slip amount of ordinary steel bars is smaller under the same bonding stress.The bonding properties of GFRP bars with ribbed surface and UHPC are better than those of ordinary concrete.The greater the diameter of the steel bar,the ultimate bond stress decreases slowly,and the ultimate load increases gradually.
作者
唐宇哲
刘恒
周景深
TANG Yu-zhe;LIU Heng;ZHOU Jing-shen(Hunan Technical College of Railway High Speed,Hengyang,Hunan,421200,China)
出处
《建材技术与应用》
2023年第6期23-27,共5页
Research and Application of Building Materials
基金
2022年湖南省教育厅科学研究项目(22c0828)
2021年湖南省自然科学基金项目(2021JJ50080)
2021年湖南省自然科学基金项目(2021JJ60026)。
作者简介
唐宇哲(1996-),男,湖南郴州人,硕士,2022年7月硕士研究生毕业于华东交通大学建筑与土木工程专业,现从事新型材料UHPC静动力特征及桥梁工程方面的研究与教学工作。
