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Batzo said:But physically speaking, I cant see why it is right
IDS said:For flexural deflection the top and bottom surfaces change in length, and the vertical sections rotate.
For shear deflection the top and bottom surfaces remain the same length. The top and bottom surfaces have the same inclination, and the vertical sections remain vertical, so the rotation due to shear deflection is zero. It is the rotation of the vertical sections that is transferred to connected beams, so the shear deflection does not contribute to that rotation.