Results do not match for the Verification of Example "Buckling-06"

Creation date: 8/23/2019 4:13 PM Updated: 5/20/2023 7:35 PM

Question:

I am trying to reproduce the results of the verification example "Buckling-06" in the attached MIDAS Civil model. The results of my buckling analysis are far from the example. Please let me know why is the case.
One thing, which I noticed was that the Ixx (torsional moment of inertia) calculated by the software is different from the Ixx used in the example hand calculations, while Ix, Iy, What is the reason for this difference and how can this be fixed?

Thanks

Answer:

Please use the second MIDAS file that is attached to this message.

Good Afternoon,

We have reported it to our developers and would update you on the progress.

Regards
B Swapnil Agarwal
Technical Support Engineer
Global Technical Center

Good Morning,

The resason the buckling results aren't matching is due to the software is taking the PSC Value Type section as "tapered" section and for the tapered section the radius of gyration is set to zero. Thur, torsional buckling mode shape is missed. We would be correcting this section properties in the future update.

Currently, there could be general section used as shown:

2) Or use the "I Shape with 2T or Web" :

We are attaching the modified file for your reference.

Kindly let us know if further assistance is required.

Regards

B Swapnil Agarwal
Technical Support Engineer
Global Technical Center

Good Afternoon,

The issue with the PSC Value type section is now resolved in the latest patch.

The patch is now available

Link

To apply the patch, please follow the steps below:
1) Download the patch by Clicking on above patch link
2) Extract the content of the file
3) Paste them at the location where midas Civil is installed. Default location is - C:\Program Files\ MIDAS\midas Civil
4) When prompted to replace existing files, please click yes

Kindly let us know if further assistance is required.

Regards
B Swapnil Agarwal
Technical Support Engineer
Global Technical Center

DataImage19.png

DataImage28.png

Buckling-06-Beam Model.mcb

Buckling-06-Beam Model[1].mcb

Cruciform 300x6.sec

Cruciform 300x6.mgs

Buckling-06-Beam Model.mcb

Buckling-06 Lateral buckling of a simply supported cruciform column subjected to a concentric axial load.pdf

Files		Sort by Name Sort by Date
	DataImage19.png 121 KB
	DataImage28.png 19 KB
	Buckling-06-Beam Model.mcb 125 KB
	Buckling-06-Beam Model[1].mcb 90 KB
	Cruciform 300x6.sec 351 b
	Cruciform 300x6.mgs 4 KB
	Buckling-06-Beam Model.mcb 72 KB
	Buckling-06 Lateral buckling of a simply supported cruciform column subjected to a concentric axial load.pdf 455 KB

Results do not match for the Verification of Example "Buckling-06"

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