Responses of concrete-filled FRP tubular and concrete-filled FRP-steel double skin tubular columns under horizontal impact
Responses of concrete-filled FRP tubular and concrete-filled FRP-steel double skin tubular columns under horizontal impact
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DOI：
10.1016/j.tws.2020.106941
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发表时间：
2020-10
影响因子：
6.4
通讯作者：
Chen Zhilin-;Jun Wang;Jiye Chen;H. Gangarao;Ruifeng Liang;Weiqing Liu
中科院分区：
文献类型：
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作者：
Chen Zhilin-;Jun Wang;Jiye Chen;H. Gangarao;Ruifeng Liang;Weiqing Liu
本文介绍了纤维增强聚合物（FRP）管混凝土（CFFTs）和GFRP-钢双层钢管混凝土柱（DSTCs）在水平冲击荷载作用下的试验和分析结果。讨论了玻璃钢管壁厚和冲击速度对冲击波的影响。FRP管的厚度对冲击力峰值和最大位移的影响不显著。在相同的冲击能量下，FRP-钢管混凝土试件的最大位移比CFFT试件小约40%。冲击速度对冲击力峰值的影响大于持续时间。建立了三维有限元模型，对两种组合柱的冲击性能进行了数值模拟，并与试验结果进行了比较。然后，使用验证的有限元模型进行参数化研究。通过在振动方程中引入折减因子，考虑了冲击损伤的影响，得到了冲击作用下组合柱侧向位移的解析解。分析结果与试验结果的对比表明，所提出的理论模型可以准确地预测最大位移。
This paper presented the experimental and analytical results of concrete-filled fiber-reinforced polymer (FRP) tubes (CFFTs) and concrete filled GFRP-steel double skin tubular columns (DSTCs) under horizontal impact loads. The influences of the thickness of FRP tubes and impact velocity were discussed. The thickness of the FRP tubes had insignificant influence for both the peak impact force and the maximum displacement. Under the same applied impact energy, the maximum displacement of concrete filled FRP-steel DSTC specimens was ~40% smaller than that of CFFT specimens. The impact velocity had more influence on the peak impact force than the duration. Three-dimensional finite-element (FE) models were developed to simulate the impact behavior of two types of composite columns and the numerical results are compared with the test data. Then, the verified FE model was used to conduct parametric study. Moreover, analytical solutions for lateral displacement of composite columns under impact were obtained, in which the effect of impact damage was considered by introducing reduction factors into the vibration equations. The comparison between analytical results and test results showed that the maximum displacement can be accurately predicted by the proposed theoretical model.