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Experimental investigation on the seismic performance of GFRP-wrapped thin-walled steel tube confined RC columns

机译：GFRP包裹薄壁钢管约束RC柱抗震性能试验研究

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摘要

In order to eliminate buckling in thin-walled steel tube confined reinforced concrete (RC) columns, the external fiber-reinforced polymer (FRP) composite wraps may be applied. This paper reports the details and results of a series of seismic tests on FRP-wrapped thin-walled steel tube confined RC columns. A total of six full-scale circular cantilever columns were tested under combined constant axial load and lateral cyclic displacement excursions. The test specimens consisted of a control RC column, a carbon FRP (CFRP) confined RC column, a glass FRP (GFRP) confined RC column, a thin-walled steel tube confined RC column, and two GFRP-wrapped thin-walled steel tube (GST) confined RC columns of varying axial load levels. The diameter and height of the RC columns were 400 mm and 1600 mm, respectively, and the outer diameter to thickness ratio of the steel tubes was 135. The seismic responses of the test specimens were compared in terms of failure mode, hysteric behavior, ductility, stiffness degradation, energy dissipation capacity and equivalent viscous damping ratio. The effects of the GFRP wraps and the steel tube on the behavior of the GST confined column were revealed respectively. Test results showed that the steel tube confined column experienced local buckling and abrupt welding seam splitting resulting from high biaxial stresses, whereas such premature failure was prevented in the GST confined RC columns. For the specimens designed and tested in this study, both components in the GST contributed much to the seismic performance of the GST confined column, while the thin-walled steel tube was more effective than the GFRP wraps in improving the ultimate drift ratio. In addition, as the axial compression ratio was increased from 0.2 to 0.45, there was almost no decrease in displacement ductility for the GST confined columns. (C) 2015 Elsevier Ltd. All rights reserved.
机译：为了消除薄壁钢管承压钢筋混凝土（RC）柱的屈曲，可采用外部纤维增强聚合物（FRP）复合包裹材料。本文报告了在FRP包裹的薄壁钢管约束RC柱上进行的一系列地震测试的细节和结果。在恒定的轴向载荷和横向循环位移偏移的共同作用下，总共测试了六个全尺寸的圆形悬臂圆柱。测试样品包括一个控制RC柱，一个碳FRP（CFRP）约束RC柱，一个玻璃FRP（GFRP）约束RC柱，一个薄壁钢管约束RC柱和两个GFRP包裹的薄壁钢管（GST）限制了不同轴向载荷水平的RC柱。 RC柱的直径和高度分别为400 mm和1600 mm，钢管的外径与厚度之比为135。比较了试样的地震响应，包括破坏模式，滞后行为，延性。 ，刚度下降，耗能能力和等效粘性阻尼比。分别揭示了玻璃钢包裹和钢管对GST约束柱性能的影响。试验结果表明，钢管约束柱由于高双轴应力而发生局部屈曲和突然的焊缝分裂，而在GST约束钢筋混凝土柱中避免了这种过早破坏。对于本研究中设计和测试的标本，GST中的两个成分都对GST约束柱的抗震性能起了很大的作用，而薄壁钢管比GFRP缠绕更有效地改善了最终漂移率。另外，随着轴向压缩比从0.2增加到0.45，GST约束柱的位移延性几乎没有降低。 （C）2015 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Engineering Structures》 |2016年第1期|269-280|共12页
  • 作者

    Cai Zhongkui; Wang Daiyu; Smith Scott T.; Wang Zhenyu;

  • 作者单位

    Harbin Inst Technol, Minist Educ, Key Lab Struct Dynam Behav & Control, Harbin 150090, Peoples R China|Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Peoples R China;

    Harbin Inst Technol, Minist Educ, Key Lab Struct Dynam Behav & Control, Harbin 150090, Peoples R China|Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Peoples R China;

    So Cross Univ, Sch Environm Sci & Engn, Lismore, NSW 2480, Australia;

    Harbin Inst Technol, Minist Educ, Key Lab Struct Dynam Behav & Control, Harbin 150090, Peoples R China|Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Reinforced concrete; Steel tube confined columns; Local buckling; Confinement; FRP; Seismic performance;

    机译：钢筋混凝土;钢管密实柱;局部屈曲;约束;玻璃钢;抗震性能;

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