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SPRstructur15-Moonstone
15-Moonstone
March 28, 2018
Solved

Preparation Element of Matrix in Mathcad Prime

  • March 28, 2018
  • 5 replies
  • 4441 views

Dear All,

Please help solve this 
I want to Preparation Preparation Element of Matrix and get Result(Yellow) as picture below.

Many Thank,

PC-12.png

Best answer by Werner_E

Here is what you had asked for, but it might be a good idea to follow Terry's advice for a different approach to the main problem.

Bild.png

5 replies

T
21-Topaz II
terryhendicott21-Topaz II
21-Topaz II
March 28, 2018

Hi

 

Suggestion for a different scheme that will make your life easier.

Set a high number on the diagonal as infinite stiffness at a reaction point.

S
SPRstructur15-MoonstoneAuthor
15-Moonstone
March 28, 2018

I think mine is miserable to do Smiley Very Happy 
I don't have document like your , Could you share document or Book as infinite stiffness at a reaction point?
That I follow Structural Analysis Hebbeler 8th.

PC-13.png

T
21-Topaz II
terryhendicott21-Topaz II
21-Topaz II
March 28, 2018

Hi,

 

I work faster in Mathcad rather than Prime.

I have done an analysis of a 3 span structure using first principles.

I have done the same analysis in Strand 7 for the same result.

 

I have used  a 4x4 matrix for beam stiffness not 2x2 this means you can have nodes midspan.

Enclosed is the file.  I will do this in Prime tonight for you.

S
SPRstructur15-MoonstoneAuthor
15-Moonstone
March 28, 2018

Many thank

W
Werner_E25-Diamond IAnswer
25-Diamond I
March 28, 2018

Here is what you had asked for, but it might be a good idea to follow Terry's advice for a different approach to the main problem.

Bild.png

    S
    SPRstructur15-MoonstoneAuthor
    15-Moonstone
    March 28, 2018

    Excellent ! Heart

    I got a lot from you!

    many thank

    T
    21-Topaz II
    terryhendicott21-Topaz II
    21-Topaz II
    March 28, 2018

    Hi,

     

    I recommend a different approach that is far simpler to implement.

     

      S
      SPRstructur15-MoonstoneAuthor
      15-Moonstone
      March 28, 2018

      Many Thank for your help,
      I will try read and understand it.

      F
      Fred_Kohlhepp23-Emerald I
      23-Emerald I
      March 28, 2018

      Just a simple observation:  You don't need the programming--your definition works in one line:

      Capture.PNG

        T
        21-Topaz II
        terryhendicott21-Topaz II
        21-Topaz II
        March 28, 2018

        Just a simple observation.

        In the simplest case it can be done in one line as the analysis member stiffness is identical, and it is a beam in a line. That is why it is easier to understand.

        If the situation is a little more complicated with different analysis member stiffness and beams in a 2D frame work it needs an additional element definition called "nc" for node connectivity matrix to define the situation and four lines only instead of the one to define structure global stiffness "Ksg"

        Cheers

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