Buckling of steel reinforcing bars in FRP-confined RC columns: An experimental study
Buckling of steel reinforcing bars in FRP-confined RC columns: An experimental study
复制标题
FRP 约束 RC 柱中钢筋的屈曲：实验研究
DOI：
10.1016/j.conbuildmat.2017.02.149
复制
发表时间：
2017-06-01
影响因子：
7.4
通讯作者：
Teng, J. G.
中科院分区：
文献类型：
--
作者：
Bai, Yu-Lei;Dai, Jian-Guo;Teng, J. G.
通过试验研究了FRP约束对单调和循环轴压下钢筋混凝土柱纵向配筋屈曲性能的影响。12 FRP约束RC柱和12 FRP约束素混凝土柱（控制标本）的测试结果，特别注意的演变，在纵向钢筋和FRP护套的应变随着负载的增加。对FRP约束混凝土柱进行单调轴压试验，通过从轴压总荷载中减去FRP约束素混凝土的贡献，推导出纵向配筋对柱轴压总荷载的贡献。试验结果表明，FRP约束钢筋混凝土柱中纵向钢筋的受压应力-应变响应与受拉试验相同，在屈曲变形开始前，轴向应力逐渐减小。FRP约束和纵向钢筋屈曲之间存在显著的相互作用。这种相互作用应仔细考虑时，制定本构关系的纵向钢筋和FRP约束混凝土用于理论建模。(C)2017爱思唯尔有限公司版权所有
An experimental study was conducted to investigate the influence of FRP confinement on the buckling behavior of longitudinal steel reinforcing bars (rebars) in RC columns subjected to monotonic and cyclic axial compression. Test results of 12 FRP-confined RC columns and 12 FRP-confined plain concrete columns (control specimens) are presented with particular attention to the evolution of strains in the longitudinal steel rebars and the FRP jacket as the load increases. For an FRP-confined RC column subjected to monotonic axial compression, the contribution of longitudinal steel rebars to the overall axial load carried by the column was deduced by subtracting the contribution of the FRP-confined plain concrete from the total axial load. The test results showed that the compressive stress-strain response of longitudinal steel rebars in FRP-confined RC columns follows that from tensile testing before the axial stress reduces gradually due to the onset of buckling deformation. Significant interactions were found to exist between FRP confinement and the buckling of longitudinal steel rebars. This interaction should be carefully considered when formulating constitutive laws for both the longitudinal steel rebars and the FRP-confined concrete for use in theoretical modeling. (C) 2017 Elsevier Ltd. All rights reserved.