Modeling and parametric study of beam-to-column connection for self-centering steel moment frames

A new type of beam-to-column connection for steel moment frames is proposed.The new connection uses bolted top and seat angles,and post-tensioned(PT) high-strength steel strands running along the beam.The PT strands tie the beam flanges on the column flange to resist moment and provide self-centering force.A general FEM analysis program called Abaqus 6.9 is adopted to model 9 new connections subjected to cyclic loading.The effects of the prestressing forces,the thickness of the angles,and the distance and the amount of the PT strands on the behaviour of the connections are investigated.The results show that the connections have an initial stiffness similar to that of the welded connections.Under 5% drift,the columns and beams remain elastic while the angles sustain inelastic deformations for energy dissipation.After the unloading,the connections have zero deformation.They can be restored to the original condition by simply replacing the angles.