Fix spring stiffness for BarReleases

[IsakNaslundBh]

NOTE: Depends on

Issues addressed by this PR

Closes #393

Makes sure the spring stiffness is picked up by changing the check if a DOF is released from checking if identical to free to instead check if it is not fixed.

Test files

https://burohappold.sharepoint.com/:f:/s/BHoM/Evb6D2Mx5SlCldKS1XidhaUBl2Bi4gJ-lwtbV259ropqFg?e=0sPAc7

Changelog

Additional comments

[JosefTaylor]

Needs similar change in ToBHoM in order to catch springs - see changes in SAP2000
Push works properly.

[IsakNaslundBh]

thanks @JosefTaylor .

Have fixed now!

[JosefTaylor]

axes are switched between pulling and pushing: Push uses XZY, pull uses XYZ- I am not sure which one is right! I think it is XZY.

[IsakNaslundBh]

axes are switched between pulling and pushing: Push uses XZY, pull uses XYZ- I am not sure which one is right! I think it is XZY.

You are right 🤦‍♂️ . Have fixed now, thanks for spotting.

Also added another section of the script to verify that the order is correct by looking at reactions, and as you stated, XZY looks to be correct. Really confusing with Etabs Left-hand rule with switched orientations between 1 and 2 compared to BHoM (and what I have seen in most other packages).

Anyhow, code updated and added a small method over the quite long statement of ?s and :s as I found that a bit hard to read if we look at this again :)

[JosefTaylor]

Works great!

[JosefTaylor]

I have this transform matrix in SAP2000; is there a way we could use it to create releases?

public static TransformMatrix barLocalAxisToBHoM = new TransformMatrix()
        {
            Matrix = new double[4, 4]
            {
                { 1,  0,  0, 0 },
                { 0,  0, -1, 0 },
                { 0,  1,  0, 0 },
                { 0,  0,  0, 1 }
            }
        };

[IsakNaslundBh]

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@IsakNaslundBh to confirm, the following checks are now queued:

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