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Describe the bug
I am trying to simulate a grade beam, so I have made a beam model that is supported by springs. I apply a simple UDL or Point load at the centre of the beam and the total sum of my reactions is 2x what my UDLxL or point load are. I have attached a screen shot of the statics check.
I double checked all of my inputs, and the best guess I have (apart from a bug) is that I initialized the spring supports incorrectly... but I can't see where.
I've isolated the issue and have corrected it in the GitHub repo. I'll push this change out with version 0.0.93.
The program did not like having both a support and a spring at the same node. This helped me lock on to a bigger bug that was reporting phantom reactions at unsupported degrees of freedom that should not be showing any reactions. Thank you for reporting. That bug was a tricky one to find and only triggered under very rare circumstances.
Well this is great! This is my first time reporting anything, and I'm glad I could help; I'm also very glad you're so responsive. This is an impressive tool, and am looking forward to following its development.
Describe the bug
I am trying to simulate a grade beam, so I have made a beam model that is supported by springs. I apply a simple UDL or Point load at the centre of the beam and the total sum of my reactions is 2x what my UDLxL or point load are. I have attached a screen shot of the statics check.
I double checked all of my inputs, and the best guess I have (apart from a bug) is that I initialized the spring supports incorrectly... but I can't see where.
To Reproduce
Import the attached module (as".py")
fdn_model_20240311_issue.txt
and call up a beam with this script:
input_dict = {"mat": "conc",
"L": 10000,
"w": 1000,
"E": 23000,
"A": 1e6,
"Iz": 83333333333,
"Iy": 83333333333,
"nu": 0.3,
"rho": 24e-6,
"J": 10e6,
"subgrade_modulus": 0.1,
"n_springs": 10,
"UDL": [1,1,0,10000],
"pt_loads": [(0,5000)]
}
gb = fdn.grade_beam(**input_dict)
gb.analyze(check_statics=True) <- this should produce the screenshot attached.
Expected behavior
I was expecting to have the sum of the reactions match my input forces.
Screenshots
![image](https://private-user-images.githubusercontent.com/155027032/311932239-f4d02046-29d2-463b-ae62-7d06a09b15f6.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MjU0NjA2NzgsIm5iZiI6MTcyNTQ2MDM3OCwicGF0aCI6Ii8xNTUwMjcwMzIvMzExOTMyMjM5LWY0ZDAyMDQ2LTI5ZDItNDYzYi1hZTYyLTdkMDZhMDliMTVmNi5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjQwOTA0JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI0MDkwNFQxNDMyNThaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1iZTZjOGYyYTJjMWFkZjE2NTkyNGFkZTk3MDM1MzhlMmVlYTcxNGU4NTkzYmFkMWJjNjJhYjFkYWIwY2I1MDExJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCZhY3Rvcl9pZD0wJmtleV9pZD0wJnJlcG9faWQ9MCJ9.nxH6Jkei39fgNY-ll0Q8AFhzWyDIo2PDU9BPjFeyhKk)
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