Nonlinear pushover analysis of concrete column reinforced by multi-layered, high strength steel UL700 plates

• Concrete column is reinforced by multi-layered UL700 plates.
• Reinforcement with multi-layered UL700 plates improves both stiffness and ductility.
• Contact surface of concrete columns and plates is implemented by the connect-tie method.
• Reinforced concrete column is verified by static nonlinear pushover analyses.

This research relates to a reinforced version of existing column structures based on reinforcing plates. More specifically, this research aims to propose a new type of reinforced column structure based on reinforcing plates that has stronger resistance against the load of architectural structures. The reinforced structure of column structures based on reinforced plates supports reinforcing plates, which are combined to form a closed section through attachment to the outer circumference surface of the column structures; reinforcing members containing other reinforcing plates, which are combined to form a closed section around the other circumference surface of the reinforcing plates; joint members which combine the reinforcing members on the outer circumference surface of the column structure, and the load of a beam member at the contact part of the column structure and of a beam member equipped between the beam member and the reinforcing members. Furthermore, the reinforced structure is also composed of plate members with the shape of a variable cross-section, whose thickness increases as it gets closer to the column structure. Through a non-linear structural-behavior analytical test based on FEM-ABAQUS 6.5-1, the structural stiffness and ductility of new reinforcement-method alternatives of RC column structures based on reinforcing steel plates was investigated, and the result values for parameters of steel material characteristics were comparatively verified.