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Stiffness modification method

  1. Feb 12, 2017 #1
    1. The problem statement, all variables and given/known data

    I dont understand why the stiffness for span have extension pin stated from original stiffness ... According to online notes , for the far end pin / roller , the k is 3EI / L but not 3EI / 4L , is the notes wrong ? And i dont understand what is AA' beam , can someone explain about it ? According to online notes , for the far end pin / roller , the k is 3EI / L but not 3EI / 4L , is the notes wrong ? And i dont understand what is AA' beam , can someone explain about it ?
    . And I also dont understand why the span beam have extension pin is 3/4 from the original stiffness ? It's now shown in the notes ..

    2. Relevant equations


    3. The attempt at a solution

    I think the notes is wrong , it should be 3EI / 4L ..
     

    Attached Files:

  2. jcsd
  3. Feb 19, 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 19, 2017 #3
    Can you help ?
     
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