Abstract
Superior high-performance (SHP) steel is a kind of advanced steel with high strength and ductility, fire-resistant, and corrosion-resistant performance. It is especially suitable for structural engineering resistant to natural disasters such as fire, earthquake, environmental corrosion, etc. This paper aims to investigate the hysteresis behaviour of SHP steel welded I-section beam-columns. Four full-scale specimens under the combined action of constant axial load and horizontal reciprocating load were tested, and finite element models were developed accordingly. Based on comparisons of the test phenomena, failure modes, hysteretic curves, strain curves, energy dissipation capacity and ductility, effects of flange and web width-to-thickness ratio on the performance of the specimens were clarified. In addition, a 3-D finite element model was developed and further validated against the test results. Variation ranges of flange width-to-thickness ratio, web width-to-thickness ratio and axial load ratio were increased to further analyze the influence of critical parameters on the seismic performance of SHP steel beam-column in the parametric analyses. Finally, according to the test and finite element modelling results, whether the seismic performance of the SHP steel welded I-section beam-columns complies with the relevant provisions of the national standards Eurocode 3 and GB 50011–2010 was evaluated, and design suggestions were proposed accordingly. Research outcomes showed that the SHP steel beam-columns with good energy dissipation capacity and ductility could be applied to seismic steel frames in practical engineering; the failure modes of the specimens are local buckling rather than member instability; a smaller width-to-thickness ratio of the specimen could lead to a plumper hysteresis curve, more sufficient development of plasticity, a greater total energy consumption, and better ductility performance; the web and flanges have certain restrained effects, which should be comprehensively considered in seismic design of the SHP steel beam-columns. The research findings herein may provide an important basis for understanding the hysteresis behaviour of the SHP steel beam-columns as well as for their application in practice.
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