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Dynamic Collapse Load-carrying Capacity of Concrete Frame Structures Based on Refined Finite Element Model
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    Abstract:

    To evaluate the load-carrying capacity of concrete frame structures under dynamic loads in case of sudden column failure, this paper is based on the multi-stage repeated collapse dynamic tests of mid-column removal in reinforced concrete (RC) and fully assembled precast concrete (PC1 exposed corbel dowel rob nodes) concrete frame substructures carried out by the research team, the accuracy of the sub-structural detailed finite element model established by the ABAQUS software was verified by fitting the displacement response curves under primary collapse load conditions, and the damage resistance of the frame structure to progressive collapse was quantified and evaluated using the column removal method. Since the research team tests were multiple repetitive collapse tests, it was not possible to obtain the load-carrying capacity in one collapse for the RC and PC1 (exposed corbel dowel rob nodes) specimens, and dynamic load tests were not conducted for the fully assembled precast concrete (PC2 hidden corbel dowel rob nodes). The final damage loads of the RC, PC1 and PC2 frame structures were predicted using the trial algorithm based on the accurate calibration model, and the failure modes and damage conditions of the three structures were compared and analyzed. During the failure, the RC beam-column was severely damaged, the reinforcement at the beam end was pulled off, the concrete at the connection area of the fully assembled precast concrete beam end was crushed, and the dowel rob was sheared off. The collapse resistance of the reinforced concrete specimen was significantly higher than that of the fully assembled precast concrete specimen, and it was also found that the collapse resistance load-carrying capacity of the fully assembled precast concrete structure can be improved by strengthening the steel angle cleat of the assembled structure.

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  • Received:
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  • Online: April 13,2023
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