Background to the Monolithicity Factors for the Assessment of Jacketed Reinforced Concrete Columns

The paper presents the background to expressions adopted in new Eurocode 8—3 for jacketed reinforced concrete columns. These are based on commonly concept of monolithicity factors (ratios resistance section that an identical monolithic one). derived here two ways: (i) by fitting experimental results columns and (ii) extended parametric study substandard (R/C) members were retrofitted adding R/C jackets, analysed using a model developed authors takes into account slip at interface. Apart from cross-section geometry thickness jacket, parameters investigation material properties core as well percentage longitudinal reinforcement jacket dowels placed connect existing member jacket. It was found parameter had most visible effect these normalised axial load (ν). finally either simple functions ν or constant values.