Experimental Moment-Rotation Behavior of Semi-Rigid Beam-to-Column Connections

An experimental research was accomplished to examine the rotational capability of extended end-plate connections and stiffened fin plate connections. Four extended end plates and four stiffened fin plate connections configurations were tested under monotonic loading histories suggested by SAC. In addition, the connections suitability for use in seismic resisting moment frames (SRMF) were examined for ductility to find that all the connections achieved more than 0.03 rad rotation which is minimum rotation capacity required by Eurocode for high ductility class structures. Experimental results for maximum moment resisted by the connections were compared with analytical predictions. All the tested connections except one, F200x200, achieved higher moments than the predicted moments. The experimental results demonstrated that, the extended end plate moment connections can be detailed and designed by using the web plates and stiffeners in certain locations so as to be reliable for use in seismic regions. However, the stiffened fin plate connections have very high rotational capacity with very low moment capacities unless three or more bolts in a row is used. Keywords: Connection tests, Moment-rotation curves, Moment frame, Extended end plate, Stiffened Fin plate, Monotonic loading.