Steel and Composite Structures

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Mechanical behavior of FRP confined steel tubular columns under impact

  • Liu, Qiangqiang (College of Civil Engineering, Nanjing Tech University) ;
  • Zhou, Ding (College of Civil Engineering, Nanjing Tech University) ;
  • Wang, Jun (College of Civil Engineering, Nanjing Tech University) ;
  • Liu, Weiqing (College of Civil Engineering, Nanjing Tech University)
  • Received : 2016.12.09
  • Accepted : 2018.04.21
  • Published : 2018.06.25
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Abstract

This paper presents experimental and analytical results of fiber reinforced polymer (FRP) confined steel tubular columns under transverse impact loads. Influences of applied impact energy, thickness of FRP jacket and impact position were discussed in detail, and then the impact responses of FRP confined steel tubes were compared with bare steel tubes. The test results revealed that the FRP jacket contributes to prevent outward buckling deformation of steel at the clamped end and inward buckling of steel at the impact position. For the given applied impact energy, specimens wrapped with one layer and three layers of FRP have the lower peak impact loads than those of the bare steel tubes, whereas specimens wrapped with five layers of FRP exhibit the higher peak impact loads. All the FRP confined steel tubular specimens displayed a longer duration time than the bare steel tubes under the same magnitude of impact energy, and the specimen wrapped with one layer of FRP had the longest duration time. In addition, increasing the applied impact energy leads to the increase of peak impact load and duration time, whereas increasing the distance of impact position from the clamped end results in the decrease of peak impact load and the increase of duration time. The dynamic analysis software Abaqus Explicit was used to simulate the mechanical behavior of FRP confined steel tubular columns, and the numerical results agreed well with the test data. Analytical solution for lateral displacement of an equivalent cantilever beam model subjected to impact load was derived out. Comparison of analytical and experimental results shows that the maximum displacement can be precisely predicted by the present theoretical model.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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