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This paper describes a series of experimental tests followed by ÿnite element simulations produced to enable the prediction of moment resistance and rotation capacity of minor axis beam-to-column semi-rigid connections. These investigations motivated the development of a mechanical model to assess the connection's structural response. The mechanical model is based on the component method of design, in accordance with the Eurocode 3 speciÿcation. This philosophy implies that each joint component is represented by a spring possessing a non-linear force versus displacement (F-) curve. The model was subsequently calibrated against experimental and ÿnite element results previously performed.