Analysis-oriented model for FRP tube-confined concrete: 3D interpretation of biaxial tube behaviour
Analysis-oriented model for FRP tube-confined concrete: 3D interpretation of biaxial tube behaviour
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跨中支撑预应力 CFRP 板加固 RC 梁:实验研究
DOI:
10.1016/j.engstruct.2022.114987
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发表时间:
2022-12
影响因子:
5.5
通讯作者:
Jia-Qi Yang
中科院分区:
文献类型:
--
作者:
Zhiyuan Li;Peng Feng;Jia-Qi Yang
Filament-wound fibre-reinforced polymer (FRP) tubes are an emerging FRP product employed in various FRP-concrete composite structures, such as concrete-filled FRP tubes (CFFTs). Due to the fibre orientations in the tube wall, the filament-wound FRP tube exhibits biaxial behaviour under simultaneous axial compression and hoop expansion, causing relaxation of the confining stress. Therefore, the conventional hoop tension test may result in overestimation of the confining stiffness. In this paper, the biaxial behaviour of FRP tubes is theoretically investigated using classical laminate theory in conjunction with an analysis-oriented model for FRP-confined concrete. The geometrical meaning of the biaxial tube behaviour is interpreted intuitively using the 3D geometrical approach previously proposed by the authors. For the convenience of analysis and design, this paper proposes a simplified approach to rectify the confining stiffness that considers both elastic and nonlinear biaxial effects. The predicted results show good agreement with the collected test data.
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