rain Due to BendingРConsider a beam segment of length L.?After deformation, the length of the neutral surface remains L. At other sections,Р7РStress Due to BendingРFor a linearly elastic material,РFor static equilibrium,РFirst moment with respect to neutral plane is zero. Therefore, the neutral surface must pass through the section centroid.РFor static equilibrium,Р8РBeam Section PropertiesРThe maximum normal stress due to bending,РA beam section with a larger section modulus will have a lower maximum stressРConsider a rectangular beam cross section,РBetween two beams with the same cross sectional area, the beam with the greater depth will be more effective in resisting bending.РStructural steel beams are designed to have a large section modulus.Р9РProperties of American Standard ShapesР10
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