Is the Shear Flow Direction Incorrect in Preventing Beam Twisting?

AI Thread Summary
The discussion centers on the relationship between shear flow and beam twisting, questioning whether the direction of shear flow is correct. It highlights that both the moment due to the applied force (Pe) and the moment due to shear flow are counterclockwise, raising concerns about how Pe can prevent twisting. The conversation suggests that the shear flow might need to be directed from the bottom to the top to effectively counteract twisting. Participants clarify that Pe represents the applied force while F is the resultant force of shear flow. Understanding these dynamics is crucial for minimizing beam twist in structural applications.
fonseh
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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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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.
 
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BvU said:
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.
why ? P is the applied force , and F is the resultant force of shear flow, right ?
 
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