Steel and Composite Structures

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Effect of bolt preloading on rotational stiffness of stainless steel end-plate connections

  • Yuchen Song (School of Civil Engineering, The University of Sydney) ;
  • Brian Uy (School of Civil Engineering, The University of Sydney)
  • Received : 2022.05.18
  • Accepted : 2023.09.03
  • Published : 2023.09.10
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Abstract

This study investigates the effect of bolt preloading on the rotational stiffness of stainless steel end-plate connections. An experimental programme incorporating 11 full-scale joint specimens are carried out comparing the behaviours of fully pre-tensioned (PT) and snug-tightened (ST) flush/extended end-plate connections, made of austenitic or lean duplex stainless steels. It is observed from the tests that the presence of bolt preloading leads to a significant increase in the rotational stiffness. A parallel finite element analysis (FEA) validated against the test results demonstrates that the geometric imperfection of end-plate has a strong influence on the moment-rotation response of preloaded end-plate connections, which is crucial to explain the observed "two-stage" behaviour of these connections. Based on the data obtained from the tests and FE parametric study, the performance of the Eurocode 3 predictive model is evaluated, which exhibits a significant deviation in predicting the rotational stiffness of stainless steel end-plate connections. A modified bi-linear model, which incorporates three key properties, is therefore proposed to enable a better prediction. Finally, the effect of bolt preloading is demonstrated at the system (structure) level considering the serviceability of semi-continuous stainless steel beams with end-plate connections.

Keywords

Acknowledgement

This work was financially supported by the Australian Research Council (ARC) under its Discovery Project scheme (DP180100418). The first author was supported by the Engineering and Information Technologies Research Scholarship (EITRS) awarded by the University of Sydney. Special thanks to Dr. Dongxu Li for his assistance in conducting the experimental tests. Some of the stainless steel materials used in the tests were generously donated by Outokumpu, Stirlings, Bumax, and Hobson, which are gratefully acknowledged.

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