What is section modulus?

Section modulus (S) is a geometric property that measures a beam's bending strength, defined as S = I/c where I is moment of inertia and c is distance from neutral axis to extreme fiber.

What is the difference between elastic and plastic section modulus?

Elastic section modulus (S) assumes linear stress distribution. Plastic section modulus (Z) assumes the entire cross-section has yielded. Z is always greater than or equal to S.

What units is section modulus measured in the USA?

In the USA, section modulus is measured in cubic inches (in³) per AISC standards.

How do you calculate section modulus for an I-beam?

For an I-beam: First calculate Ix = [B*H³ - (B-tw)*(H-2tf)³]/12, then Sx = 2*Ix/H. Where B=flange width, H=total depth, tf=flange thickness, tw=web thickness.

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