Experimental study of the collapse-resistant behavior of RC beam-column sub-structures considering catenary action
Under blast or impact loads, disproportionate collapse would be likely for a majority of high-rise buildings without special collapse-resistant design. Five axially restrained beam tests with various reinforcement ratios, various classes of steel bar, and various loading velocity, were conducted. The collapse-resistance behavior of beam-column substructures was studied considering catenary action under the failure of RC column. Both ends of the specimens were pinconnected and fixed on steel boxes and two steel tubes were embedded in both ends of the specimen. The load was continuously applied on the top of the middle column in scheduled time by the servo-hydraulie actuator with displacement-controlled mode, and the pin-supported RC beam-column experienced elastic, plastic and eatenary stages.The collapse occurred at a vertical displacement of about 400mm due to the rupture of the bottom steel bars, and the member ultimate capacity was about 2 times as much as the plastic stage, but the displacement was nearly 20 times more. Based on the experimental results, the applied load process was analyzed and the transition process of the applied load mechanism was discussed, and a simplified calculation method for eatenary action was presented for collapseresistant design of beam-column sub-structures.
NETL
NSTL
万方数据
维普
