Author(s)

A. P. Lampropoulos, O. T. Tsioulou & S. E. Dritsos

Abstract

This study examines the behaviour of reinforced concrete (RC) columns strengthened with either a RC jacket or an additional RC layer. The main object of this work was to evaluate the behaviour of the strengthened specimens for different connection procedures used to bond the old and new concrete. For the column strengthened with a concrete jacket, the effect of the roughness of the interface on the behaviour of the strengthened specimen was examined. For the column strengthened using an additional RC layer, the presence of shear connectors between the old and new reinforcement was also examined to provide adequate connection between the two concrete members. The strength degradation of the interface because of the cyclic loading was taken into account. Using the results of the analyses, monolithic coefficients (these are special coefficients that correlate the behaviour of the strengthened specimens to the respective monolithic) were calculated for the different connection procedures examined. Keywords: concrete, column, strengthening, jacket, finite element, interface, friction, cohesion, shear connectors. 1 Introduction Strengthening of RC columns using additional concrete layers and jackets perimetric to the initial element is a quite common technique used for the strengthening of RC members. However, there are many uncertainties about the behaviour of the strengthened elements. The finite element method was used to examine the behaviour of columns strengthened with RC jacket or additional RC

Keywords

concrete, column, strengthening, jacket, finite element, interface, friction, cohesion, shear connectors.