This paper presents the results of tests on five types of beam-to-column connections. Increasing use is being made of haunched and non uniform end connections to move the plastic hinge away from column, where construction deficiencies can cause premature fracture. All five connection types tested successfully prevented premature rupture by neutralizing the negative effect of weld access holes, and exhibited large deformation capacity. However their maximum strength and plastic deformation capacity are attributed to the fracture toughness and the crystallinity of the beam materials and welds.
