Hello- This isn't a homework problem, but a real life problem. I'm trying to size a beam for a set of stairs that I'm trying to design. I have some material picked out, and it looks strong enough, but when I try to run some numbers to confirm, they don't appear to match what I've experienced in the real world. 1. The problem statement, all variables and given/known data Calculate the maximum deflection of a simply supported beam given the following: Total length: 27 feet Material: Steel (E=30x10^6 lb/in^2 Cross section: See image Weight: 0.283 lb/in^3 2. Relevant equations Maximum deflection of uniformly loaded simply supported beam (from Schaum's Outline Series, Strength of Materials 2/ed, P.161) y=5/384 * wL^4/EI 3. The attempt at a solution Using the given above, along with the following: w = 104.107 lb/ft I = 23.05 in^4 Using the maximum deflection equation from above solving for y yields: y=259.23 inches This means that the middle of the beam will deflect almost 260 inches due to it's own weight?? I must be doing something wrong.....any help would be appreciated. Thanks.