Progressive Collapse Resistance of Emulative Precast Concrete Frames with Various Reinforcing Details

In this paper, three precast concrete (PC) frames and one cast-in-situ reinforced-concrete (RC) frame were cast tested to investigate the load-resisting mechanisms of emulative PC with various reinforcing details resist progressive collapse. beams frames, top reinforcement was continuous without curtailment while bottom had different anchorage strength. Test results indicated that, in event middle column removal, similar RC frame, beam action, compressive arch action (CAA), tensile catenary (TCA) could be developed sequentially connections, sufficient strength or additional U-shaped bars passing through joint obtain level CAA capacity as frame. However, they may achieve relatively lower TCA due higher bond between topping layer beams, owing layer, resulting earlier fracture reinforcements. Conversely, insufficient comparable their less than that pulling-out failure reinforcements, preventing further development strain hardening at stages. Based on test analytical studies, it found connections provide rotational ensure tie-force required by design guidelines.