The strength and stiffness of unstiffened perforated steel plate shear panels decrease with Increasing size of opening. This reduction Is approximately linear vlth Increasing area of opening. This mother was verified with conducting a series of quasi - static cyclic loading tests on unstiffened steel plate shear panels, with centrally placed circular and square openings. Alt the panels tested exhibited adequate ductility and stable S- shaped hysteresis loops, with the energy absorbed per cycle Increasing with the maximum amplitude of the shear displacement. Experimental results are copmared with a previously developed theoretical model for predicting the hysteretic characteristics of unstiffened plate shear panels, which Incorporates the influences of shear buckling and plastic yielding of the plate, and an assumed linear reduction in stiffness and strength to allow for openings.
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