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Three full-scale reinforced concrete frame sub-assemblages were tested in the laboratory to simulate the removal of an interior column. The location of bottom longitudinal reinforcement splices was varied in each specimen to evaluate ACI 318-19 detailing practices on perimeter frame beam behavior. The laboratory specimens represent two first-floor interior spans of the perimeter frame of a 10-story prototype building designed for Seismic Design Category (SDC) A. After specimens reached their peak force, a sudden decrease in force was observed due to a sudden shear failure near the exterior end of one of the beams. Failure occurred prior to the development of catenary action in the beams, a phenomenon that has been observed in similar tests of specimens detailed according to higher SDCs. The limited rotation capacity of the beams in the specimens and the shear-strength degradation as a result of diagonal …