Plastic Section Modulus of a Trapezoid formulas |
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\( Z_x \;=\; \dfrac{ h^2 \cdot \left( g\cdot c^2 + 14\cdot c\cdot a + g\cdot a^2 \right) }{ 12\cdot \left( c + a \right) } \) \( Z_y \;=\; \dfrac{ 6\cdot c\cdot a\cdot h - 3\cdot c^2\cdot h - 8\cdot c + 8\cdot a + 4\;g^2 \cdot h - 8\cdot g }{ 24} \) |
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| Symbol | English | Metric |
| \( Z \) = plastic section modulus | \( in^3 \) | \( mm^3 \) |
| \( a, b, c, d \) = edge | \( in \) | \( mm \) |
| \( h \) = height | \( in \) | \( mm \) |
