A numerical simulation was conducted to investigate the local buckling behaviour of the bolted steel plates in steel jacketing\ntechnique. The numerical model was firstly validated by the results of a previous experimental study. Then a parametric study\nwas conducted to investigate the influence of different restraint measures on the local buckling behaviour and the sensitivity of the\nbuckling behaviour to the initial imperfection. Fitted formulae were developed to calculate the structural field capacity of the bolted\nsteel plates, and recommended values of stiffener size were also provided to facilitate the strengthening design of steel jacketing.
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