This is a general formula, because you can determine what the stress is at any point in the cross section by plugging in a value for y. Where M is the bending moment at a point on the steel pile (called Design Moment) and y is the vertical distance from the bending axis at the middle (centroid) of the cross section. When calculating the stress in a steel pile, the formula using I is: Generally speaking, I (Moment of Inertia) is a geometrical value, used for stiffness determination and is therefore important to determine deflections in the vertical cross section and is used for more general calculations when compared to section modulus which is usually used to determine the resistance in the horizontal cross section against bending moments. Better Understanding Section Modulus, Design Moment and Moment of Inertiaīoth the Moment of Inertia and the section modulus are measurements of the relative stiffness of a cross section of steel piling.
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