Abstract
This paper investigates how masonry openings influence the seismic performance of infilled reinforced concrete frames. Eight 1/3-scale, single-story, single-bay frame specimens, designed according to current code provisions, were tested under reversed cyclic, quasistatic, horizontal loading up to a drift level of 4%. In all the examined cases, the shear strength of columns was higher than the cracking shear strength of solid infill. The parameters investigated include the shape and the size of the opening. Assessment of the behavior of the frames was also attempted based on the observed failure modes, strength, stiffness, ductility, energy dissipation capacity, and degradation due to cycling. For all the examined cases of infilled frames, various forms of openings had a significant effect on the reduction of strength, stiffness, and energy dissipation capability. A continuous force-deformation model based on an equivalent strut approach is proposed for masonry infill panels with openings. By varying the control parameters, the model can be used to replicate a wide range of monotonic force-displacement behavior resulting from different design and geometry.
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