عنوان مقاله [English]
For structural and architectural reasons, masonry infill walls are widely used in building construction. Civil engineers usually consider infill walls as architectural elements and ignore them in structural analysis and design. However, it has been proven that infill walls change the behavior of structures, and, therefore, it would not be correct to ignore their significance in the analysis and design of a structure. The last few years have seen an increase in research into the subject, and many different models that consider the role of infill walls in analyses, have been proposed. Among all proposed models, the strut model is the most popular, thanks to its practicality and fair accuracy. During an earthquake, forces are applied both in-plane and out-of-plane of the infill wall. Nevertheless, this simultaneous
effect is ignored in most proposed models (including the strut model). Thus, this research is an attempt to scrutinize the behavior of structures under such a simultaneous effect.
In this research, first by micro modeling of the components of an infill wall, such as brick and interface elements, a one story, one bay model of an infill wall is made and subjected to numerical analysis. For this purpose, after comparing analytical results with experimental data and verification of the analytical model, the simultaneous effect of in-plane and out-of-plane loads is investigated. It shows that the in-plane damage has a significant effect on the
out-of-plane stiffness and capacity of the infill wall. Furthermore, after careful studies on effective parameters in the behavior of the out-of-plane infill wall, it has been proven that the subject needs more in-depth study. The result of the research reveals that the simultaneous effect of the in-plane and out-of-plane forces has little to do with the in-plane capacity of the infill wall, but significantly reduces its stiffness and out-of-plane strength.