This paper presents a study of welded perforated beam-to-column connections, forming the so-called RWS systems. The effect of using non-standard novel web opening configurations of variable depths and positions is investigated. The ease of manufacturing process together with the improvements on the structural behaviour foreshadows the enhancements gained using these perforated members. It is concluded that using large perforations is an effective way of improving the behaviour of connections enhancing their ductility and their energy dissipation capacity. The connections with novel openings outperform the conventional ones; hence they can be suitably used in the aseismic design of steel frames.
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