Simplified seismic modelling of reinforced concrete flexural members

摘要

The need for simplified models that can accurately represent the behaviour of structures is increasing. Engineers need such models to assess and/or to design structures using pre-specified performance measures. In the current paper, the abilities of a previously developed model for reinforced concrete flexural members are significantly enhanced. The model represents a member by an elastic element and two inelastic end elements. Each inelastic element consists of three concrete and three steel springs. A rational approach to calculate the properties of these springs is developed. The approach includes a simplified method to account for slippage of reinforcing bars. The model allows identification of the localised damage (concrete cracking, reinforcement yielding, concrete crushing or bond slip failure) responsible for any change in the overall performance of a reinforced frame. To illustrate the use of this approach and to validate its predictions, two cantilever columns are modelled and analysed under monotonic and cyclic loadings.