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Lets say we have an I-channel used in a beam and load is acting in vertical direction only on the beam. This means shear stress is only in vertical direction in transverse sections of the beam. But still shear flow is always shown in horizontal direction also in flanges. Why?

2007-06-10 03:29:38 · 1 answers · asked by Muhammad Ali 2 in Science & Mathematics Engineering

1 answers

When a beam bends, the top fibers of the beam are loaded in compression because that becomes the inside of the bending curve, and the bottom fibers of the beam are loaded in tension.
So, as the beam bends, the top of the beam in compression tries to get shorter, and the bottom of the beam, in tension, tries to get longer.
This shortening of the top surface and lengthening of the bottom surface can only occur if the top and bottom surfaces can move or slide horizontally with respect to each other.
This attempt at horizontal motion results in a horizontal shear stress in the beam.
This occurs in all beams subjected to bending loads.
This maximum horizontal shear stress is a maximum at the center of the beam's cross section, and is zero at the top and bottom of the flanges.

2007-06-10 04:46:13 · answer #1 · answered by gatorbait 7 · 1 0

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