# Shear flow at shear center

1. Jan 2, 2017

### fonseh

In the figure , we can notice that the moment due to Pe is counterclokwise , but moment due to shear flow is also counterclockwise , How can the Pe prevent the twisting of the beam ?

Or is the direction of the shear flow wrong ? Should it flow from the below to the top ?

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2. Jan 3, 2017

### BvU

From how I read it: $P\times e$ is the resultant of the shear flow and gives you a distance $e$, the distance (on the other side of the web!) at which you can apply the actual load that offsets $P\times e$, thus causing a minimum of twist.

3. Jan 3, 2017

### fonseh

why ? P is the applied force , and F is the resultant force of shear flow, right ?