新型FRP-UHPC组合筋的横向剪切性能  

Transverse shear behaviour of novel FRP-UHPC hybrid bars

作　　者：叶玉仪 周捷凯 曾俊杰 YE Yuyi;ZHOU Jiekai;ZENG Junjie(Department of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学土木与交通工程学院,广州510006

出　　处：《复合材料学报》2022年第11期5333-5342,共10页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52178277,52008116);广东省杰出青年基金(2021 B1515020029)。

摘　　要：纤维增强树脂复合材料(FRP)-超高性能混凝土(UHPC)组合筋是一种新型无钢组合筋(简称“组合筋”),由外FRP管、中心FRP筋及两者之间填充的UHPC组成。该组合筋解决了FRP筋受压易屈曲问题,同时因其不含钢材等易腐蚀成分而具有良好的耐久性。因其亦具有较好剪切性能,本文对组合筋的横向剪切性能进行了试验研究,关键变量为外FRP管纤维缠绕角,对照试件为FRP管约束UHPC试件和FRP裸筋。研究结果表明,在横向剪切荷载作用下,组合筋的两个峰值荷载均比对照试件的峰值荷载大58%以上,变形能力比FRP管约束UHPC对照试件的变形能力大220%以上,因此组合筋各组分之间良好的协同工作使其具有良好的抗剪性能。最后,提出了一种组合筋剪切强度的计算方法,并用试验结果验证了该方法的准确性。Fibre-reinforced polymers(FRP)-ultra-high performance concrete(UHPC)hybrid bars are a new type of steel-free hybrid bars,which comprise an outer FRP tube,a central FRP bar and an annular layer of UHPC.Hybrid bars are proposed to fix the issue that the fibers in FRP bar are easily buckled under compression and are expected to have an excellent durability because all the components in hybrid bars are anti-corrosion materials.As it is expected that the hybrid bars have satisfactory shear behavior,this paper presents an experimental study on the transverse shear behaviour of hybrid bars.The key variable was the fibre winding angle of the outer FRP tube and the counterparts included the UHPC-filled FRP tubes and the bare FRP bars.It is demonstrated that the two peak loads of hybrid bars are at least 58%larger than the peak load of their counterparts under the transverse shear loading.The deformation capacities of hybrid bars are also found to be at least 220%larger than that of the UHPC-filled FRP tubes,and the UHPC-filled FRP tube and the central FRP bar in hybrid bars are in an optimal combination,leading to excellent shear behaviour of hybrid bars.An equation for calculating the shear strength of hybrid bars is proposed and verified by the test results.

关 键 词：FRP筋 UHPC FRP管约束UHPC试件 组合筋 横向剪切性能 

分 类 号：TB332[一般工业技术—材料科学与工程]