持续荷载作用对GFRP筋-海工混凝土黏结性能的影响
Effect of sustained load on the bond performance between GFRP bars and marine concrete
赵潍越 1商怀帅 1杨加兴 1聂志超2
作者信息
- 1. 青岛理工大学 土木工程学院,青岛 266525
- 2. 青岛海陆通工程质量检测有限公司,青岛 266033
- 折叠
摘要
为研究持续荷载作用下GFRP筋与海工混凝土间的黏结性能,设计制作了16个GFRP筋-海工混凝土梁式黏结性能试件,在不同持续荷载等级(0%Pu,25%Pu,45%Pu,65%Pu)作用下进行了为期120 d的持载试验.对持载过程中GFRP筋-海工混凝土间的瞬时滑移及时变滑移进行了测试分析,并建立不同持载等级作用下的GFRP筋-海工混凝土间时变滑移模型;对比分析了持续荷载作用下GFRP筋与混凝土和普通钢筋与混凝土间的滑移量大小及变化规律.试验结果表明:瞬时滑移量随着持载等级的提高而增大,加载端滑移量大于自由端滑移量;时变滑移量随时间呈非线性增长,前期增长较快,后期滑移量逐渐趋于稳定;两种筋材与混凝土间的时变滑移变化规律相似,但GFRP筋与混凝土间的滑移量要远大于普通钢筋与混凝土间的滑移量.
Abstract
In order to study the bond performance between GFRP bar and marine concrete under sustained load,16 GFRP bar-marine concrete beam specimens were designed and fab-ricated.The 120-day sustained load test was carried out under different sustained load levels(0%Pu,25%Pu,45%Pu and 65%Pu).The instantaneous slip and time-varying slip be-tween GFRP bar and marine concrete during the loading process were analyzed,and the time-varying slip models under different load levels were established.The size and variation of the slip between GFRP bar and concrete and of the slip between ordinary rebar and con-crete under continuous load were compared and analyzed.The test results show that the in-stantaneous slip increases with the increase of sustained load level,and the slip at the loading end is greater than that at the free end;the time-varying slip increases nonlinearly with time;the slip increases rapidly in the early stage and tends to be stable in the later stage;the laws of change of time-dependent slips between the two reinforcement materials and concrete are similar,but the slip between GFRP bar and concrete is much greater than that between ordinary rebar and concrete.
关键词
GFRP筋/海工混凝土/持续荷载/梁式试件/黏结强度/滑移量Key words
GFRP bar/marine concrete/sustained load/beam specimen/bond strength/slip引用本文复制引用
基金项目
国家自然科学基金(51778310)
山东省自然科学基金重大基础研究项目(ZR2022ZD33)
滨海城乡建设工程安全与性能提升研究创新团队项目()
山东省"双一流"建设工程土木项目()
出版年
2024
NETL
NSTL
维普
万方数据