Solid rectangular section

Formulas

Cross-sectional area

$$A = b\ h$$

Second moment of area about the y-y axis

$$I_y = \frac{b\ h^3}{12}$$

Second moment of area about the z-z axis

$$I_z = \frac{h\ b^3}{12}$$

Elastic section modulus about the y-y axis

$$W_{\mathrm{el},y} = \frac{b\ h^2}{6}$$

Elastic section modulus about the z-z axis

$$W_{\mathrm{el},z} = \frac{h\ b^2}{6}$$

Plastic section modulus about the y-y axis

$$W_{\mathrm{pl},y} = \frac{b\ h^2}{4}$$

Plastic section modulus about the z-z axis

$$W_{\mathrm{pl},z} = \frac{h\ b^2}{4}$$

Shear area

$$A_v = b\ h$$

Notations

• $h$section depth, in mm
• $b$section width, in mm