In order to study aseismic performance of a new prefabricated concrete frame joints with partial high strength tendons, low cyclic repeated load tests were performed for 4 post-pouring integral prefabricated beam-column joints and 1 cast-in-situ comparative one to explore their failure mode, hysteresis curve, displacement ductility coefficient, energy dissipation capacity and stiffness degradation. The test results showed that additional steel bars located in joint’s core area can effectively improve joint’s load-bearing capacity and deformation one, realize plastic hinges’ off-shifting at beam ends and improve joint’s energy-dissipation ability; compared with the cast-in-situ joint, the energy-dissipation ability of prefabricated ones is weaker within the initial stage of loading, with increase in loading, the latter’s energy-dissipation ability is stronger than that of the former; in elastic stage, the stiffness of all prefabricated joints is smaller than that of the cast-in-situ one, while in yield stage, the stiffness of the latter is larger than that of the former; thus, prefabricated frame joints with partial high strength tendons have larger safety stock and can be popularized and applied in areas with seismic fortification.
Key words
High strength tendons /
prefabricated assembly /
frame joints /
seismic performance /
low cycle repeated load test
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Footnotes
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