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Simply supported beam

  1. Dec 10, 2014 #1
    1. The problem statement, all variables and given/known data
    Hello, I did the question but would like for someone to clarify if its right. The question states " 19 inches from one end" but I used the center deflection formula and Im not sure if its right.
    It is question 2 of the picture
    IMG_20141210_09375_edit_1418222343023.jpg

    2. Relevant equations
    equation is in the picture
    3. The attempt at a solution
    My solution is in the picture
     
  2. jcsd
  3. Dec 10, 2014 #2

    SteamKing

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    Unless 19 inches is half of 6 feet 4 inches, no, you did not use the correct formula to calculate the deflection of this beam. Why did you think they put that box with a different beam formula right under the title of the problem?
     
  4. Dec 10, 2014 #3
    I thought so, since I used the maximum deflection one. I am having a little trouble understand the formulas for "deflection at anysection in terms of x"
    I think I am supposed to use y = Pbx / 6LEI ( L2-x2-b2 but I am not sure weather x is 19 and b is 57 or
    x is 57 and b is 19
    How would I know this?
     
  5. Dec 10, 2014 #4

    SteamKing

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    Look at the diagram attached to the formula. That should tell you what to use for a and what to use for b. Notice that one distance is longer than the other.
     
  6. Dec 10, 2014 #5
    okay, so If you look at the picture I used the first formula of the middle column where 0<x<a
    I made b = 19 and from the formula to calculate x I got 42.5
    My final answer is 2.289 lbs
     
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