4/6/2023 0 Comments Portal frame calculateDesign optimization is achieved by minimizing the sum of normalized column and beam moments of inertia necessary to satisfy a prescribed drift ratio limit. Since the drift ratio, defined as the ratio of the frame lateral deflection to column height, δ, is one of the controlling factors in the design of portal frames subjected to lateral loads, the design optimization is performed as a function thereof. It presents, both analytically and graphically, the procedure that is used to establish the design optimization. This follow-up article discusses similar design optimization under the influence of lateral loads. An article in the March 2008 issue of STRUCTURE magazine discussed design optimization of portal frames, such as those shown in Figure 1, under gravity loads. Optimum Beam-to-Column Stiffness Ratio of Portal Frames under Lateral Loads By Pedro Silva, Ph.D., P.E.
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