Steel Angle Plastic Section Modulus

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SUMMARY

The discussion focuses on calculating the plastic section modulus for steel angle sections about local axes (x & y) after determining them for global axes (n & p). The user seeks a method to transform global properties to local using Mohr's Circle, expressing concerns about complications arising from fillets (r1 & r2) in the geometry. The consensus suggests either ignoring the fillets or simplifying them to square shapes, as is common in AISC tables for elastic properties.

PREREQUISITES
  • Understanding of plastic section modulus calculations
  • Familiarity with Mohr's Circle for stress transformation
  • Knowledge of steel angle section properties
  • Basic principles of structural engineering and mechanics
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  • Research Mohr's Circle applications in structural analysis
  • Study methods for calculating plastic section modulus for rotated axes
  • Explore AISC guidelines on ignoring fillet effects in section properties
  • Investigate software tools for automated section property calculations
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Structural engineers, civil engineering students, and professionals involved in the design and analysis of steel structures, particularly those working with angle sections and plastic section properties.

Engineering01
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Hi all,

I am after trying to find the plastic section modulus about both local axes (x & y) after having calculated them for the global axes (n & p). Is there a way I can transform global to local using Morh’s circle to evaluate plastic section properties?

Attached is the key diagram I am working to:
ILon6fJ.png


I have been able to evaluate all other section properties locally and globally except for the local plastic section modulus about the x and y axes. I want to avoid going back to first principals in evaluating the plastic section modulus about the rotated local axes because they may cut through the fillets (r1 & r2) which will really complicate things.

Any advice would be greatly appreciated.
 
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I'm not aware of any such transformation. Either ignore the fillets or square them off. After all, in tabulating elastic properties, especially in the AISC tables, these fillets for angles are ignored anyway.
 
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