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Experimental Study on Progressive Collapse Resistance of Fully Assembled Precast Concrete Frame Substructure with Ductile Connections
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    Abstract:

    To research the progressive collapse resistance performance of fully assembled precast concrete frame structure, two half-scale precast concrete(PC) specimens were designed and studied by static tests. The PC specimens were built by high-strength bolt and anchor plate with ductile rod connections in the beam-column joint region, where one specimen(PC1) was designed without corbel component, while the hided corbel was employed in another one(PC2). In addition,a cast-in-situ reinforced concrete(RC) frame tested by our research team previously was used as a comparison reference. The quasi-static load tests were conducted for the specimens under mid-column loss scenario. The structure responses including ultimate loading capacity,strain response,deformation performance and failure mode were discussed,respectively. Compared with the RC specimen where both compressive arch action(CAA) and catenary action existed, only the CAA was observed in PC specimens,indicating that this type of PC structures has a lower secondary progressive collapse resistance capacity. Meanwhile,the ultimate load of PC1 and PC2 was 95% and 123% of that of RC specimen at CAA stage,respectively,while the ultimate displacement of PC1 and PC2 was 48% and 61% of that of RC specimen, respectively. During testing,the deformation and strain response of PC specimens was mainly concentrated on the joint region. The PC specimens were damaged by the fracture of ductile rod with anchor plate.

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  • Received:
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  • Online: July 16,2020
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