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15-Moonstone

## Preparation Element of Matrix in Mathcad Prime

Dear All,

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

Many Thank,

1 ACCEPTED SOLUTION

Accepted Solutions
24-Ruby V
(To:SPRstructur)

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.

10 REPLIES 10
21-Topaz I
(To:SPRstructur)

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.

15-Moonstone
(To:terryhendicott)

I think mine is miserable to do
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.

21-Topaz I
(To:SPRstructur)

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.

15-Moonstone
(To:terryhendicott)

Many thank

24-Ruby V
(To:SPRstructur)

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.

15-Moonstone
(To:Werner_E)

Excellent !

I got a lot from you!

many thank

21-Topaz I
(To:SPRstructur)

Hi,

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

15-Moonstone
(To:terryhendicott)

I will try read and understand it.

23-Emerald I
(To:SPRstructur)

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

21-Topaz I
(To:Fred_Kohlhepp)

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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