Shear behaviour of FRP-confined concrete/UHPC core-encased rebar: Experimental investigation and design method
Shear behaviour of FRP-confined concrete/UHPC core-encased rebar: Experimental investigation and design method
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DOI：
10.1016/j.engstruct.2023.115951
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发表时间：
2023-03-20
影响因子：
5.5
通讯作者：
Li, Zhiyuan
中科院分区：
文献类型：
--
作者：
Hu, Li;Feng, Peng;Li, Zhiyuan
FRP约束混凝土/超高性能混凝土(FRP-R)复合核心筋是近年来发展起来的一种新型FRP-混凝土组合结构构件。在轴心受压和弯-压组合荷载作用下，利用fccc-R可以同时提高组合结构构件的强度和延性。当在低剪跨比的柱和剪力墙等竖向结构构件中应用时，fccc-Rs受到轴压和剪力的共同作用。在这项研究中，试验研究了fccc-Rs的剪切性能。共测试了28个fcc-R试件。通过试验得到了试件的破坏机理、破坏模式、荷载-挠度曲线和极限强度。Fccc-Rs具有较高的承载能力和变形能力。结果表明，FRP管、混凝土和钢筋的组合可以达到“1+1+1&3”的效果。此外，还研究了剪跨比、混凝土强度、管壁厚度和纤维取向等因素的影响。最后，提出了轻骨料混凝土抗剪强度的设计公式，与试验结果吻合较好。
FRP-confined concrete/UHPC (ultra-high-performance concrete) core-encased rebar (FCCC-R) is a recently developed novel structural component for FRP-concrete composite structures. FCCC-R utilization can improve both the strength and ductility of composite structural members under both axial compression and combined bending-compression loading. When implemented in vertical structural members such as columns and shear walls with a low shear-span ratio, FCCC-Rs are subjected to combined axial compression and shear. In this study, the shear behaviour of FCCC-Rs is experimentally investigated. A total of 28 FCCC-R specimens are tested. The failure mechanism and modes, the load-deflection curves and the ultimate strength were obtained from the experiments. The FCCC-Rs exhibited higher load capacity and deformability. It could be concluded that the combination of the FRP tube, concrete and rebar can achieve the effect of "1+1+1>3". Furthermore, the in-fluence of the shear-span ratio, concrete strength, tube thickness and fibre orientation are examined. Finally, design equations for the shear strength of FCCC-Rs are proposed, which attain a good agreement with the test data.