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Bending of Beams with Unsymmetrical Sections

Bending of Beams with Unsymmetrical Sections C = centroid of section Assume that CZ is a neutral axis. Hence, if Mz > 0, dA has negative stress. From the diagram below, we have: yx = and ys = yxxys == and EyEyyyx = = if Mz is the only load, we have: =0dAx = 0ydAEy or =0ydA hence the neutral axis passes through the centroid C. A similar result holds for My and the Y axis. Moment equilibrium about the Z axis: = zxMydA =zyMdAyE2 zyzEIM = and about the Y axis we have: = yxMzdA =yyMdAyzE yzyyEIM = and, if CZ is a neutral axis, we will have moments such that: zyzzyIIMM = Similarly, if CY is a neutral axis, we will have moments such that: zyzyzIIMM = However, if CZ is a principal axis, Iyz = 0.

Bending of Beams with Unsymmetrical Sections C = centroid of section Assume that CZ is a neutral axis. Hence, if Mz > 0, dA has negative stress.From the diagram below, we have:

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  With, Section, Beam, Bending, Bending of beams with unsymmetrical sections, Unsymmetrical

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