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International Journal of Steel Structures

, Volume 18, Issue 2, pp 609–634 | Cite as

Experimental and Theoretical Study on High Strength Steel Extended Endplate Connections After Fire

  • Xuhong Qiang
  • Nianduo Wu
  • Yongfeng Luo
  • Xu Jiang
  • Frans Bijlaard
Article

Abstract

In order to reveal more information and better understanding on the behavior and failure mechanisms of high strength steel (HSS) extended endplate connections at ambient temperature and after fire, an experimental and theoretical study has been conducted and presented in this paper. The provisions of Eurocode 3 are verified with the test results. Because strength of bolts decreases more rapidly than that of structural steels, failure modes of endplate connections may change after fire. Hence, a series of equations are proposed to predict failure modes of endplate connections after fire. Furthermore, FE simulations which can predicate the performance of HSS extended endplate connections with reasonable accuracy are adopted to study the behaviors of the connections after cooling down from various fire temperatures and to validate the accuracy of the proposed equations. Moreover, a parametric study is carried out to explore an optimization design method. It is found that the current provisions of EC3 can justifiably predict failure modes and plastic flexural resistances of HSS extended endplate connections both at ambient temperature and cooling down from 550 °C, but it is not the case for their initial rotational stiffness and rotation capacity. In order to avoid brittle failure mode of endplate connections after fire, appropriately increasing the diameter or grade of bolts in the design is suggested. What is more, the match of steel grade and thickness of column flange and endplate as well as beam should be considered in the optimization design of beam-column endplate connections.

Keywords

High strength steel Endplate connections After fire Experimental study Theoretical study Parametric study 

Notes

Acknowledgements

The authors gratefully acknowledge the financial supports provided by National Key R&D Program of China (Grant No. 2017YFB0304701), Natural Science Foundatison of China (Grant No. 51408150), National Ministry of Finance Program (Grant No. (2013) 235) and Fundamental Research Funds for the Central Universities (Grant No. 2014KJ044).

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Copyright information

© Korean Society of Steel Construction 2018

Authors and Affiliations

  • Xuhong Qiang
    • 1
  • Nianduo Wu
    • 1
  • Yongfeng Luo
    • 1
  • Xu Jiang
    • 1
  • Frans Bijlaard
    • 2
  1. 1.College of Civil EngineeringTongji UniversityShanghaiChina
  2. 2.Department of Structural Engineering, Faculty of Civil Engineering and GeosciencesDelft University of TechnologyDelftThe Netherlands

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