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The reason behind applying the load to the central web is to focus on the deflection that occurs across the entire span of the I-Beam. This tutorial isn't concerned with the deflections that occur to the top and bottom flanges.The problem focuses on the increasing impact which shear deflection has on shorter, non-slender beams. This shear causes a difference between the analytical Euler-Bernoulli solution and the 3D finite element model.