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Volume 55 Issue 4
Jul.  2020
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Article Contents
Journal of Southwest Jiaotong University  > 2020  >  55(4): 796-803, 819.
WANG Luming, LIU Yanhui, ZHU Wenkai, HE Tingjun, KANG Xiangjie. Damage Assessment Method for Concrete-Filled Steel Tubular Columns under Impact Loading[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 796-803, 819. doi: 10.3969/j.issn.0258-2724.20181037
Citation: WANG Luming, LIU Yanhui, ZHU Wenkai, HE Tingjun, KANG Xiangjie. Damage Assessment Method for Concrete-Filled Steel Tubular Columns under Impact Loading[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 796-803, 819. doi: 10.3969/j.issn.0258-2724.20181037
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Damage Assessment Method for Concrete-Filled Steel Tubular Columns under Impact Loading

doi: 10.3969/j.issn.0258-2724.20181037
  • Received Date: 18 Dec 2018
  • Rev Recd Date: 28 Feb 2019
    • Available Online: 23 Mar 2020
  • Publish Date: 01 Aug 2020
    Abstract
  • In order to develop a damage assessment method for concrete-filled steel tubular (CFST) columns subjected to lateral impact, the drop hammer impact tests are carried out on CFST columns near supports. By the use of numerical simulation and theoretical analysis, the effects of pre-loading axial force, impact mass and impact velocity on the damage degree of CFST columns are studied. The impact mass and velocity are selected as the main control variables of damage assessment for CFST columns. Then the calculation formula D of damage assessment based on the residual bearing capacity is established and the levels of damage assessment are defined. The damage assessment method is given by taking a typical CFST column subjected to lateral impact. The damage assessment curves are fitted by simulation and trial calculation, and then the graphic method for damage assessment is established. The results show that the impact mass and velocity have great influence on the damage degree, while the effect of pre-loading axial force on the damage degree has great variability. The damage assessment curves (D=0.3, 0.5, 0.7) divide the coordinate plane into four regions, which respectively represent the slight damage, moderate damage, severe damage and failure for CFST columns. According to the position relationship between the combination point of the impact mass and velocity and the damage assessment curves, the damage degree of CFST columns can be quickly determined.

     

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