횡 하중 작용 시 스터드 철판으로 보강된 RC 플랫 플레이트 내부 접합부의 구조성능에 관한 실험적 연구

Abstract

Flat plate slab has been widely used in high rise buildings for its remarkable advantages. However, punching shear failure has become increasingly important issue with the spread of flat plate slab. The results of an experiment program on punching shear performance of RC slab-column connections are presented in this paper. The first one of five specimens was severed as the control specimen. Two of them were strengthened by studs welded on the rails according to ACI 421.1R-99. The others were reinforced by studs with perforated steel plates. Specimens were tested under constant gravity shear load and the lateral displacement was applied on the top surface of column in a reversed cyclic manner. Punching shear failure occurred for the control specimen at drift ratio of approximately 6%. The specimens with studs on the steel plates showed a significant flexural yielding and sustained deformation up to a drift ratio of 10.6% to 11.9% without obviously losses of strength. Furthermore, the results exhibited a maximum increase of 52.29% on ductility of the joints comparison to the control sample. Punching shear failure was not observed in this kind of upgraded specimens. The results of the experimental program showed that the flat plate slab strengthened by stud with steel plates is successful in increasing deformation resistance capacity, ductility and avoiding punching shear failures. It can be widely used in high rise buildings.