Figure 3 shows the case of pure bending of a beam with rectangular cross section.
3.
For structures subject to pure bending, this also explains the use of flat plates of variable lengths added to the flanges of these " I " profiles to obtain the inertia or resisting moment required, with the greatest degree of accuracy.
4.
Note that this equation implies that pure bending ( of positive sign ) will cause zero stress at the neutral axis, positive ( tensile ) stress at the " top " of the beam, and negative ( compressive ) stress at the bottom of the beam; and also implies that the maximum stress will be at the top surface and the minimum at the bottom.
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