Influence of geometrical parameters of infill on the resistant shear of infilled frames

One of the most simplifying computational assumptions in the design of buildings is the omission of infills in the analysis and design of structures. The reason for this is the extremely complex nonlinear behavior of these members that fall into the category of non-structural components. International codes usually apply some factors to the equations in order to enter the influence of infills. Many studies have reported the key role of such members in the resistance of structures against earthquakes and other unexpected accidents. Therefore, it seems crucial to study structures considering infills. In this study, the resistant shear of the infilled frames is investigated by considering the existence of infills. The geometrical parameters affecting the behavior of such members are analytically studied in detail and some relations are suggested for the effects of thickness, length and height of infills. Some of the existing macro theories for modelling of infills along with the proposed relations by the researchers to examine the infilled frames are also reviewed. The proposed results show that square infills with equal length and height have the least amount of resistant shear. In addition, increasing the thickness of the casing will have a significant effect on the resistant shear of the frame.