Proof-of-concept Testing and Finite Element Modelling of Self- Stabilizing Hybrid Rectangular Links for Eccentrically Braced Frames

This paper describes the design, testing, and finite element modeling, of a proofof-concept eccentrically braced frame specimen utilizing a hybrid rectangular shear link. The link is self-stabilizing and does not require lateral bracing, making it suitable for use in steel bridge piers where lateral bracing can be difficult to provide (building applications are possible as well). Equations used for design are given and references for their derivations are provided. The quasistatic cyclic testing is described, and results are reported and compared with a finite element model to be used as the basis for a future parametric study. Stable and full hysteretic loops were obtained and no signs of flange, web, or lateral torsional buckling were observed. The link was subjected to 0.15 radians of rotation in the final cycle, which is almost twice the maximum rotation allowed in building codes for links with I-shaped cross-sections. Although the final failure mode was fracture of the bottom link flange, the large rotations achieved were well above what would be required in a seismic event, indicating that hybrid rectangular links without lateral bracing of the link can indeed be a viable alternative for applications in steel bridge piers in seismic regions.