Civil and Environmental Engineering 2220A/B Lecture 10: Lecture 10 Clarification
20 Nov 2018
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And that"s why at the end of our shear force and moment diagrams, we sometimes have that straight, abrupt drop at the end. This is the equation of the thing as we are travelling from the leftpoint along the beam to almost the rightpoint, and then it ends b/c the right point brings it back into equilibrium at 0" So what we"re doing is we"re doing is taking the moment around point a multiple times. We"re taking it each time we make a cut in the beam. We taking a cut slightly before one of the major change points in the beam. Because it"s before the change point, we don"t include the force But we also can"t have the exact length. Therefore we define an arbitrary length of x. Recall that when we take that cut, the internal forces appear.
