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Attached i have put together 2 workings out side by side, They are both concerning shear flow at specific points of a box girder. My problem is calculating Q. Once calculation (second one) shows Q to be All the area above that point mulitplied by the distance from neutral axis, whereas the first working out shows Q to be only half the area above that point multiplied by the neutral axis. Can somebdy please clear up how to calculate Q

Thanks

Thanks