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# Derivation of Formula for Angle Thickness - Seated Connection2

## Derivation of Formula for Angle Thickness - Seated Connection

(OP)
Hello! Does anybody know how this formula is derived? I see the Mc/I form of the formula but can't seem to understand why the formula has a 4 in the numerator instead of a 6.

Thank you!

### RE: Derivation of Formula for Angle Thickness - Seated Connection

Using 'plastic' section modulus, not elastic.

### RE: Derivation of Formula for Angle Thickness - Seated Connection

The value La x t^2 / 4 is the plastic section modulus Zx.
Using the value of 6 would be for an elastic section modulus Sx.
You are using LRFD with an ultimate limit state in weak axis bending.

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### RE: Derivation of Formula for Angle Thickness - Seated Connection

ha- you beat me to it.

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