What is beam deflection? It's when a pressure is placed usually on the top of a beam somewhere near the middle span. This pressure over time becomes unbearable, and because wood is somewhat elastic it bends in response to the forces placed upon it. After a while if the pressure is so relentless, the beam may just snap, as the bottom do to the curvature of bending, is stressed the most. Look at this beam and you can clearly see what I mean.
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