Investigating the Effect of Masonry Infill Walls on the 2D RC Structural Systems with Asymmetry along the Elevation
Abstract
Reinforced concrete (RC) frames with unreinforced masonry infill panels are common structural building systems
all over the world. Although many analytical investigations and experimental observations emphasize the
contribution of masonry infills to the overall stiffness and strength of the structures, their effects are not considered
by the engineers in the design and the analysis calculations. Due to the variations in the actual behavior of the infill
walls and using different parameters to define the infill walls in modeling and capacity calculations, they have
unpredictable effects on the global response of the structural systems. The purpose of this study is the simulation
of a collapse mechanism scenario that may be developed during the earthquake through applying incremental
equivalent static load. Infill panels were represented using equivalent compression diagonal struts and their effects
on the behavior of RC structural systems having asymmetrical placement of unreinforced masonry infill walls
along the elevation has been scrutinized. The equivalent static load was applied to the structural system in +/-X
directions to focus on the effects of using only one diagonal strut. It has been observed that the influence of the
infill panels on the structural system has beneficial effects in decreasing the story drift, which may be attributed to
the contributory effect of the infill panels on the lateral stiffness of the structural system. Furthermore, the axial
forces and bending moment diagrams have been plotted for each increment in the equivalent static load, which can
give insight to understand the significance of masonry infill walls.
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