A rigid block of weight W is to be supported by three identical steel bars. The bars are fixed at each end (Fig. P11.17). Assume that sidesway is not prevented and that, when an additional downward force of 2W is applied at the middle of the block, buckling will take place as indicated by the dashed lines in the figure. Find the effective lengths of the columns by solving the differential equation for deflection of the column axis.
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