Author(s)

A. G. Tsonos & I. P. Rentzeperis

Abstract

This paper presents the findings of an experimental study to evaluate methods of retrofit which addresses particular weaknesses that are often found in reinforced concrete structures, especially older structures, namely the lack of the required flexural and shear reinforcement within the columns and the lack of the required shear reinforcement within the joints. Thus, the use of two styles of four-sided reinforced concrete jackets for the pre-earthquake retrofitting case of columns and beam-column joints was investigated experimentally. In this paper the effectiveness of the two jacket styles was also compared. Keywords: beam-column frames, beams, columns, joints, cyclic loads, earthquake resistant structures, hinges (structural), reinforced concrete, repairs. 1 Introduction Damage caused by earthquakes through the years, indicated that some reinforced concrete buildings designed and constructed in the 1960s and 1970s were found to have serious structural deficiencies. These deficiencies are mainly a consequence of a lack of capacity design approach and/or poor detailing of reinforcement. As a result, lateral strength and ductility of these structures were minimal. The feasibility and technical effectiveness of two styles of four-sided reinforced concrete jacket systems in pre-earthquake retrofitting case of columns and beam-column joints was investigated in this paper. Thus, three identical reinforced concrete exterior beam – column – joint – slab – transverse beam

Keywords

beam-column frames, beams, columns, joints, cyclic loads, earthquake resistant structures, hinges (structural), reinforced concrete, repairs.