23 thoughts on “Homework 7.1”

  1. There is a lot of confusion on where the weight of the sign acts. Is the sign and bar separate rigid bodies (I.e. weight acts at 6L) or are they separate bodies (ie weight acts at 5L)?

  2. Because the sign is rigid and the beam is not, would we assume that there is a reaction moment acting at the attachment point b/w the sign and the beam that we also have to account for?

    1. Yes, you should first do an FBD of the sign with its weight and reaction force and moment to find those reactions; then an FBD of the beam with reactions at A and the end of the bar to find rxns at A.

    2. You can do this as Lukas described, or you can also do equilibrium of the beam-sign system (with the weight force acting 6L away from the fixed end) to find the reactions at A. Both methods should result in the same answer.

  3. Are we supposed to say that the sign generates a moment at the end of the bar due to there being a horizontal distance "L" between the center of mass of the sign and its connection to the bar?

  4. Hey, are we supposed to say that the sign generates a moment at the end of the bar due to there being a horizontal distance "L" between the COM of the sign and its connection to the bar?

  5. I am able to find equations for slope and deflection using the second order method, but I am unsure how to relate this to finding w. Does it have to do with the second area moment for the beam?

    1. I believe so, EI should be in your equation for v and w would be in your equation for second moment area. So you can get w from those relations

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