In a thin-walled open section (e.g., channel or I-section) subjected to vertical shear V, the shear flow q at any point along the section wall is:
Choose the correct answer
q = V x A / I
q = V x Q / I_xx (where Q = first moment of area of portion above the point about centroidal axis, I_xx = second moment of total section)
q = V / A
q = V x t / I
Correct Answer
B. q = V x Q / I_xx (where Q = first moment of area of portion above the point about centroidal axis, I_xx = second moment of total section)
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Shear flow q = V x Q / I_xx (Jourawski formula), where Q = A_above x y_bar_above (first moment of area above the cut). Shear stress tau = q/t (t = wall thickness). Shear centre = point through which shear force must act to produce no twisting. For channels and angles, shear centre is outside the cross-section.
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