STUDY ON SEISMIC PERFORMANCE OF PREFABRICATED STEEL FIBER REINFORCED CONCRETE JOINTS

In order to enhance the seismic performance of prefabricated concrete joints, the steel fibers are added to the post-poured concrete in the core zone of prefabricated beam-column joints. The refined finite element model of prefabricated beam-column joints was established based on ANSYS, the model reliability was verified by comparing with the experimental results. The mesoscopic homogenization method is employed to determine the parameter values of non-local reinforced plastic-damage microplane model of steel fiber-reinforced concrete. The influences of steel fiber volume fraction and other factors on mechanical properties of fabricated joints are studied. And the steel fiber concrete joints with different volume fractions are applied to the prefabricated frame structure, the transient dynamic analysis is performed based on OpenSEES (Open System for Earthquake Engineering Simulation), the overall seismic performance of the structure was investigated. The results show that the addition of steel fiber in the core zone improves the load-bearing capacity and ductility of the joints by 4.14%~10.52% and 2.94%~34.55%, respectively. The increase of steel fiber volume fraction in the three-layer joint zone at the bottom of the structure can reduce the interstory displacement, interstory displacement angle and base shear, and improve the seismic performance of the prefabricated frame structure. However, when the steel fiber volume fraction is higher, the improve effect on overall seismic performance of the structure becomes less evident.