Experimental Evaluation of Novel Precast Concrete Beam-to-Column Connections for Enhanced Collapse Resistance

This paper presents an experimental study of two precast concrete moment frame assemblies evaluated under a notional column-removal scenario. Derived at five-eighth scale from a 10-story prototype, each assembly consisted of two spandrel beams connected to a central column. The unsupported column was subjected to increasing vertical displacement until failure. Connections were made using either anchor bolts or high-strength threaded rods inserted into couplers embedded near the column ends. Both assemblies failed due to rupture of a bottom connection component. An energy-based analysis showed that both systems provided comparable reserve capacity against collapse. Compared with conventional steel link plate moment connections, these assemblies demonstrated improved performance and constructability, requiring no field welding. The findings support the viability of these connection types for use in precast concrete construction, particularly in applications requiring enhanced robustness under sudden column loss.