How it works: Isolation of Inelasticity in CAST CONNEX® Scorpion™ Yielding Connectors

Non-linear finite element analysis of Scorpion Yielding Connector steel casting Research Program on Steel Castings at the University of Toronto M. Gray, C. Christopoulos and J. Packer. This video shows the results of non-linear finite element analysis of a single CAST CONNEX® Scorpion™ Yielding Connector. As axial deformation in the brace moves beyond the elastic limit as a result of earthquake-induced ground motion, the specially designed fingers of the connector experience flexural yielding. The fingers deform under nearly constant curvature along their length, which in turn results in an even distribution of plasticity along the full length of each finger. CAST CONNEX® Scorpion™ Yielding Connectors offer more ductility and energy absorption capacity than conventional bracing systems. The yield force, elastic stiffness, displacement capabilities, ductility, and post-peak strengthening can all be independently tuned with this unique bracing system. The system can also be used for the seismic upgrade of seismically deficient existing reinforced concrete and steel moment-resisting frames as it represents an effective means to upgrade the stiffness, strength and ductility of these non-ductile existing structures. Scorpion™ Yielding Connectors were introduced at the 9th U.S. National and 10th Canadian Conference on Earthquake Engineering and were developed and validated through full-scale testing at the University of Toronto by Michael Gray, Constantin Christopoulos, and Jeffrey Packer. The technology has since been licensed exclusively to Cast Connex Corporation.