370 feature request formula11 1 pr en 1995 1 1 2023

[rickdegoeij]

Description

Added formula 11.1 prEN 1995-1-1 2023

Fixes # (issue)

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• I have added tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• New and existing unit tests pass locally with my changes

[github-actions]

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