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Moment distribution in beam

  1. Jan 14, 2017 #1
    1. The problem statement, all variables and given/known data
    For the circled part , i dont understand why it's 4 and 6 . I know that it's about distribute the moment according to the ratio that we have determined earlier .

    2. Relevant equations


    3. The attempt at a solution
    For 4 , shouldn't it be 240*0.4 = 96 ? For 6 , shouldn't it be 250*0.6 = 120 ?
     

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  2. jcsd
  3. Jan 18, 2017 #2

    haruspex

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    Seems to me that the process is
    1. Take the number in line 4, negate it, and in line 5 redistribute that between that column and the other column for the same node in proportion to the DFs for those two columns. Some line 5 entries will be the sum of two such redistributions.
    2. Transfer half the number in line 5 to line 6 in the neighbouring column of the adjacent node.
    So at the point you query we have -0.6 x 240 - 0.6x(-250)=6, etc.
     
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