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May 08, 2020
01:10 AM

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May 08, 2020
01:10 AM

Global stiffness 6x6

Dear all

please create automatically Global Stiffness 6x6? as pic and attachment mathcad below

Thank you

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18 REPLIES 18

May 08, 2020
07:28 PM

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May 08, 2020
07:28 PM

Hi,

Messed about with this a long time ago. Came to the conclusion that a professional software suite like SpaceGass, Microstran etc were better. The scripting in the file chooses steel sections.

The file does all you asked.

Cheers

Terry

May 08, 2020
09:32 PM

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May 08, 2020
09:44 PM

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May 08, 2020
09:44 PM

Hi,

It is an old Mathcad file and is in a very old format *.mcd.

I have resaved as Mathcad 15 *.xmcd.

You need to convert Mathcad 15 *.xmcd to Prime *.mcdx with the supplied converter.

The converter is on the ribbon header at Input/Output | PTC Mathcad Worksheets | XMCD,MCD Converter.

Not sure how the converter will go I leave that to you.

Cheers

Terry

May 08, 2020
10:48 PM

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May 08, 2020
10:55 PM

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May 08, 2020
10:55 PM

honestly, I want to calculate stiffness of example 4 to understand dynamic lesson in attachment below

can you calculate Global stiffness as example below?

May 08, 2020
11:55 PM

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May 08, 2020
11:55 PM

Hi,

My mathcad sheet can calculate the global frame stiffness matrix for the plane frame as underlined below with the 3 degrees of freedom, horizontal, vertical, and rotation.

You would then need to make the adjustments to it as described in your example by assuming rigid diaphragm action of the floors and condensing vertical displacement. The relevant mass matrix also needs to be assembled. This is not done in my sheet.

I said before commercial software suites are available to undertake such analysis and most engineering companies have access to same. The time it takes to get Mathcad working if paid at engineering charge out rates you pay for the commercial software suites. Strand7 , SAP 2000, Ansys can do this type of time domain analysis. If you are in an academic domain one of them is probably available to you.

Not to give up hope if you still want to use Mathcad 15 you should also check out the site http://www.dynamassist.com/

Cheers

Terry

May 09, 2020
09:43 PM

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May 09, 2020
03:38 PM

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May 09, 2020
03:38 PM

For the calculation, the following additional files are required:

**Asw_UB_Section**.prn**UB_Desc**.csv

May 09, 2020
04:34 PM

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May 09, 2020
04:34 PM

Hi

May 09, 2020
04:47 PM

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May 09, 2020
04:47 PM

Hi

Sorry about that__.__

Had to rename the prn file to txt to upload here.

You need to adjust that back.

Cheers

Terry

May 10, 2020
09:04 AM

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May 10, 2020
09:04 AM

terryhendicott

what file use for?

May 09, 2020
05:09 PM

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May 09, 2020
05:09 PM

I'm probably missing the point here, but is the attached along the lines of what you want?

Stuart

May 09, 2020
06:58 PM

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May 09, 2020
06:58 PM

Hi

The submitter has asked two questions the second being how to get the global stiffness of a frame with 10 nodes and 12 members then condense that to the simplified form in his second example. My answer shows how to get this global stiffness matrix.

Cheers

Terry

May 10, 2020
06:18 AM

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May 10, 2020
06:18 AM

I thought it looked a little too simple! 🙂

Stuart

(I've only got Prime Express, so have to play within its limits, ie no programming or importing of mcd/xmcd files)

Stuart

(I've only got Prime Express, so have to play within its limits, ie no programming or importing of mcd/xmcd files)

May 10, 2020
09:02 AM

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May 10, 2020
09:02 AM

Many thank for trying find solutions for me

May 10, 2020
07:38 AM

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May 10, 2020
07:38 AM

Hi,

I have changed the file to Prime.

I have fixed the plotting of input, still have to fix plotting of results.

I have shown how to extract the horizontal deflections under horizontal force at each storey into a smaller matrix delta H.

I have shown how to use this sampled deflection matrix to get the required K.E

May 10, 2020
09:00 AM

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May 10, 2020
09:00 AM

terryhendicott great work 😍😍😍👍👍👍

Many thank

May 18, 2020
10:28 PM

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May 18, 2020
10:28 PM

Hi,

I have added some wording to make understanding the file easier.

Cheers

Terry