It is a common misconception considers that masonry infill walls in structural RC buildings can only increase the overall lateral load capacity, and, therefore, must always be considered beneficial to seismic performance. Recent earthquakes have showed numerous examples of severe damages or collapses of buildings caused by structural response modification induced by the non-structural masonry partitions.
From a state-of-the-art review of the available numerical models for the representation of the infill masonry behaviour in structural response, it was proposed an upgraded model. The proposed model is inspired on the equivalent bi-diagonal compression strut model, and considers the non-linear behaviour of the infill masonry subjected to cyclic loads. The model was implemented and calibrated in a non-linear dynamic computer code, VISUALANL.
In this paper, it is presented the proposed model and the results of the calibration analyses are briefly introduced and discussed.
Reinforced concrete (RC) buildings in Nepal are constructed as RC frames with masonry infill panels.
These structures exhibit a highly non-linear inelastic behaviour resulting from the interaction between
the masonry infill panels and the surrounding frames. In this context, the paper presents an extensive
case study of existing RC-framed buildings in a high seismic risk area in Nepal. A sensitivity analysis
of the structures with masonry infill is performed. For this, the influence of different material
properties is studied, namely diagonal compressive stress, modulus of elasticity and tensile stress of
masonry infill panels. Result shows the influence on the structural behaviour particularly by variation
of the diagonal compressive strength of infill masonry panels.