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FlagShape material is from Chin-Long: https://github.com/OpenSees/OpenSees/bl ... terial.cpp

Sorry, I can't tell what's wrong with your use of elastic section.

But 1) Check your equation for G and 2) Read this for how you defined J: https://portwooddigital.com/2023/02/12/ ... anslation/

The FlagShape material is available in OpenSeesPy. Make sure you are using the latest version.

You have to get the actual source code for the model.

The WFSection2d section only discretizes fibers in one direction. You need a section with fiber discretization in two directions in order to resist moments and provide flexural stiffness in two directions for 3D elements.

The explanations in this post should help: https://portwooddigital.com/2022/05/08/switching-sides/

Thanks for letting us know. Added now: https://github.com/OpenSees/OpenSees/pull/1297

Do the example shown in this post: https://portwooddigital.com/2021/07/25/ ... -response/

Upgrade to the latest version of OpenSeesPy, then remove all the attempted string conversions from your recorder commands.

No, OpenSees does not perform modal time history analysis. You have to post-process to get the modal response.

That should work. You will have to try the approach out and compare against an expected or known solution.

Yes, you are correct. I don't recall why the if/else is overridden though.

There's no assumed units with materials in OpenSees. There's no assumption of L=1 or I=1. The interpretation of the material response is the responsibility of the element that calls the material. So if you use a zero length element and elastic material as moment-rotation, the interpretation is as su...

You can use either corotTruss or catenaryCable elements

I'm not sure, but here is the line of source code: https://github.com/OpenSees/OpenSees/bl ... l.cpp#L941