Realistic FE Models to Enable Push-Over Non Linear Analysis of Masonry Infilled Frames

The assessment of low engineered masonry infilled reinforced concrete frame (LE-MIRCF) buildings is explored using a finite element based modelling technique that enables the representation of the masonry infills in a nonlinear finite element analytical environment. A mezo-modelling approach has been developed and implemented for the masonry infills, while fibre elements are used to represent the reinforced concrete members and a spring element for the interface between these and the masonry. The methodology developed also specifically enables for the identification of the onset of shear failure in the columns.

To date the approach has been used to explore the effects of having different patterns of masonry infill distributions and openings, throughout internal frames of a five storey LE-MIRCF structure. The resulting structures were analysed in the inelastic range, and their performance assessed. The results show that the provision of masonry infills is not always damaging but nor is always advantageous. Rather it very much depends on the particular infill configuration.

The development and implementation of a simple yet sufficiently accurate modelling technique that enables the representation of the masonry infills, in an analytical environment suitable for use in the assessment of structures under seismic excitation.