Abstract
Conventional connections of I-beam-to-CHS-column are prone to local distortion of the tube-wall in presence of bending moment that reduce its resistance and rigidity, and limit the use of these connections in multi-storey portal frames. Elements passing-through the CHS column may be a good solution to increase the resistance and stiffness of connections between I-beams and tubular members. Passing-through I-beam-to-CHS-column joints develop important stiffness and resistance, although the profile cross-section dimensions variability raises the problem of slot clearance. An alternative consists in using passing-through plates and connect the flanges and the web of the I-beam outside the CHS-column. The plates dimensions are known with a good accuracy and the slot clearance can thus be reduced.This paper presents an experimental campaign performed on 14 passing-through plates-to-CHS-column joints tested under two loading configurations: equal hogging bending moments and opposite hogging/sagging bending moments. The first loading case is representative of gravity loads whereas the second loading case occurs under seismic actions, for instance. The main parameters investigated are the tube-wall thickness, the welding type, full and partial penetration butt welds or fillet welds, and the dimensions of the web/flange plates. The behaviour of these connections is compared to that of conventional directly welded I-beam-to-CHS-column joints. Cyclic tests have been performed for the second loading configuration (opposite bending moments). To reproduce the effect of upper storeys, one cyclic test has been performed with an additional constant compressive force acting on the column. Based on the test results, an analytical model is suggested for the evaluation of the bending resistance for both loading cases and the initial rotational stiffness for the symmetric loading case only. The load transfer mechanism between the different components of the joint, tube-wall, flange and web plates, is addressed.
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