Comparative nonlinear analysis of confined masonry walls: simplified micro-modelling versus finite element modelling in ETABS

This research investigates the development of a simplified micro-modelling technique for the nonlinear analysis of confined masonry (CM) walls. The primary objective of this research is to compare this novel modelling approach with the conventional finite element modelling (FEM) technique implemented in ETABS, utilizing identical modelling parameters. Furthermore, this research extends to modelling a full-scale CM building and conducting a comprehensive seismic performance assessment. In the simplified micro-modelling methodology, distinct elements represent the individual units and mortar within the brick joints. Concrete damage plasticity (CDP) models are applied, incorporating diverse elastic and inelastic parameters to represent the brick and concrete tie elements accurately. The reinforced elements are modelled using truss elements, providing a macro-level understanding of the structural behaviour. Simultaneously, FEM is executed within the ETABS platform, employing a layered technique that allows for macro-level wall modelling. The numerical results obtained through both modelling techniques are compared with the experimental results in the existing literature, establishing the validity and efficacy of the simplified micro-modelling approach. The convergence between the two modelling methodologies is pivotal, as the same model is subsequently utilized to validate the FEM technique in ETABS. This validation process is a foundation for conducting a seismic performance assessment of CM buildings. The findings of this research endeavour hold significant implications for the earthquake and masonry structure research community, offering valuable insights and methodologies for enhancing the seismic resilience of CM structures.