Active and passive confinement of shape modified low strength concrete columns using SMA and FRP systems
Active and passive confinement of shape modified low strength concrete columns using SMA and FRP systems
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DOI：
10.1016/j.compstruct.2020.112649
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发表时间：
2020-06
影响因子：
6.3
通讯作者：
R. Suhail;G. Amato;D. McCrum
中科院分区：
文献类型：
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作者：
R. Suhail;G. Amato;D. McCrum
过去对形状改性混凝土柱的约束效果进行了一些研究，但这些研究的范围大多局限于被动约束。迄今为止，尚未对形状改性混凝土柱的主动约束效果进行过研究。因此，本研究通过单调压缩试验：(1)研究形状改性混凝土柱的主动约束；(2)比较了主动约束形状修正试件与被动约束模拟试件的有效性。在本研究中，主动约束是通过形状记忆合金（SMA）螺旋的热激活预应力（HAP）和玄武岩纤维增强聚合物（BFRP）、碳纤维增强聚合物（CFRP）护套和无HAP的重复使用SMA钢丝来实现的。从强度、延性和损伤三个方面对试件的性能进行了评价。鉴于sma的复杂材料行为，本研究还旨在强调在实际应用中使用sma进行主动约束的好处和困难。研究结果表明，相对于无侧限和被动侧限形状改性试件，主动侧限形状改性试件在较大轴向变形下具有更高的延性和残余强度。
Several existing studies on the confinement effectiveness of shape modified concrete columns have been conducted in the past, but the scope of these studies has mostly been limited to passive confinement. The effectiveness of the active confinement of shape modified concrete columns has not been investigated to date. Therefore, in this study, monotonic compression tests were conducted to: (1) investigate the active confinement of shape modified concrete columns; and (2) compare the effectiveness of actively confined shape modified specimen with passively confined analogous specimens. Active confinement in this study was achieved by heat-activated prestressing (HAP) of shape memory alloy (SMA) spirals and passive confinement using basalt fibre-reinforced polymer (BFRP), carbon fibre-reinforced polymer (CFRP) jackets and reused SMA wires without HAP. The performance of the specimens was evaluated in terms of strength, ductility and damage in the specimens. In view of the complex material behaviour of SMAs, this study also aimed to highlight the benefits and difficulties of using SMAs for active confinement in practical applications. The results from this study show that as compared to unconfined and passively confined shape modified specimens, actively confined shape modified specimens exhibited significantly higher ductility and higher residual strength at relatively large axial deformation.