Numerical Investigation of Effect of Dowels on the Slip Interface of RC Jacketed Columns

Several factors can lead to affect the effectiveness of RC jacketing if a proper procedures will not be taken into account. A certain consideration has to be paid to interface between old-new concrete, which could reduce the flexural capacity. In accordance to that, the aim of the present work is to find a frictional coefficient representing the monolithic surface interaction between core and jacket of an experiment conducted by Vandoros and Dritsos in terms of load capacity. Later on a model is proposed for a minimum space limit of dowels to supply necessary friction between core and jacket surfaces to capture well roughness behavior. For that purpose, a parametrical numeric simulation analysis is conducted in a commercial FE analysis ABAQUS/Standard. Results obtained from the study shows that the friction between old-new surfaces of the experiment is well captured at 38%. Moreover, the specimen posing the maximum space limit showed to behave well with well roughness behavior in terms of displacement capacity.