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Qualitative influence line

  1. Jan 23, 2017 #1
    1. The problem statement, all variables and given/known data
    For the highlighted part , why we need to replace the support at A with a roller guide ? We could see at A , it's a pinned support , right ?

    2. Relevant equations


    3. The attempt at a solution
    Pinned support will resist horizontal and vertical reaction , why the author said it will not resist vertical force ? Is the author wrong ?
     

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  3. Feb 12, 2017 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
     
  4. Feb 13, 2017 #3
    No
    No , can you help ?
     
  5. Feb 13, 2017 #4
    I think you've completely missed the idea of constructing qualitative influence lines.
    The trick is that to do so, you must replace the support at A with a roller, it's written in the text...
     
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