In a more strict sense, positive bending is a sagging beam. ![]() This type of bending is common - where the load is pushing down and reactions at the end push upwards. Simply supported beam loaded from the top. The longer the arms the greater the bending moment - which is why the wrist is turned inwards, slightly reducing the length of each arm. He is applying a moment to each arm, turning himself into a "beam" between each ring. The gymnast pushes each arm downwards - hard. You can't normally see it happening unless the beam breaks, but bending moment is being applied everywhere along the length of the beam. The hinge is applying a moment to BOTH sides of the beam. This hinge applies a clockwise moment (torque) to the RHS, and a counter-clockwise moment to the LHS. The only thing holding it together is the spring loaded hinge. In the video above, the wooden plank has been cut through at mid span. If this is done for the other (left) side you should get the same answer - but opposite direction. It is found by cutting the beam, then calculating the MOMENT needed to hold the left (or right) half of the beam stationary. Lecture Notes: Bending-Moment.pdf Bending-Moment.one Imageīending Moment is the torque that keeps a beam together (anywhere along the beam). ![]() (stopping the left and right halves from rotating - if it was to It is the internal torque holding a beam together
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