钢板-UHPC组合加固损伤RC梁的受弯性能试验研究
Experimental study on flexural behavior of damaged RC beams strengthened with steel plate-UHPC composite
张阳 1王豪 1黄松龄 1刘颖峰 1秦筵越1
作者信息
- 1. 湖南大学风工程与桥梁工程湖南省重点实验室,长沙 410082
- 折叠
摘要
为研究钢板-超高性能混凝土组合加固损伤钢筋混凝土梁的受弯性能,对 1 根RC梁及 2 根加固梁开展了试验研究,并对其承载力、挠度、应变、裂缝发展情况等进行了分析.结果表明:相较于未加固RC梁,加固梁在抗裂性能、刚度及极限承载力方面有了大幅提升,其中开裂荷载分别提高 2.71 倍、3.19 倍,承载力分别提高了 54%、65%,刚度提升近 1 倍.由于破坏模式均为新老混凝土界面剥离破坏,极限状态下钢板及钢筋均未达到屈服强度,未能充分发挥材料性能,在加固设计中应避免此类破坏的发生.此外,基于桁架模型理论对钢板-UHPC组合加固梁剥离承载力进行了理论推导,建立了理论计算公式.结果表明:基于桁架模型理论建立的剥离承载力公式计算值与试验结果吻合,相对差值在 10%以内,此理论模型可靠.
Abstract
In order to study the flexural behavior of damaged reinforced concrete(RC)beams strengthened with steel plate-UHPC composite,one RC beam and two strengthened beams were tested,and their bearing capacity,deflection,strain and crack development were analyzed.The results show that compared with the unreinforced RC beam,the strengthened beam has a significant improvement in crack resistance,stiffness and ultimate bearing capacity.The cracking load is increased by 2.71 times and 3.19 times respectively,the bearing capacity is increased by 54%and 65%respectively,and the stiffness is increased by nearly 1 times.Since the failure mode is the debonding failure of the new and old concrete interface,the steel plate and the steel bar do not reach the yield strength under the ultimate state,and the material performance is not fully utilized.Such damage should be avoided in the reinforcement design.In addition,based on the truss model theory,the theoretical derivation of the debonding bearing capacity of the steel plate-UHPC composite strengthened beam was carried out,and the theoretical calculation formula was established.The results show that the calculated values of the debonding bearing capacity formula based on the truss model theory are in good agreement with the experimental results,and the relative difference is less than 10%.The theoretical model is reliable.
关键词
钢板-UHPC组合加固梁/界面剥离/桁架模型/剥离承载力Key words
steel plate-UHPC composite strengthened beam/debonding of interface/truss model/debonding bearing capacity引用本文复制引用
出版年
2024
NETL
NSTL
万方数据