Is the Shear Flow Direction Incorrect in Preventing Beam Twisting?

In summary, the conversation discusses the direction of the moment due to Pe and shear flow, and how Pe can prevent the twisting of the beam. There is also a question about the direction of shear flow. The conversation also mentions how P and F are related in terms of applied force and resultant shear flow force.
  • #1
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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  • #2
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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  • #3
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 ?
 

FAQ: Is the Shear Flow Direction Incorrect in Preventing Beam Twisting?

What is shear flow at shear center?

Shear flow at shear center is the distribution of shear stress throughout a structure due to external loads. It is the result of the deformation and rotation of the structure caused by the applied loads.

Why is shear flow at shear center important?

Shear flow at shear center is important because it helps to determine the internal forces and stresses within a structure. It also affects the overall stability and strength of the structure.

How is shear flow at shear center calculated?

The calculation of shear flow at shear center involves determining the shear force and moment at the center of the structure, as well as the moment of inertia and the distance from the center of the structure to the shear center.

What factors affect shear flow at shear center?

Shear flow at shear center is affected by the geometry of the structure, the location of the applied loads, and the material properties of the structure. It is also influenced by any internal forces or moments within the structure.

What is the significance of the shear center in structural design?

The shear center is an important consideration in structural design because it is the point at which the shear force and bending moment are independent of each other. This means that the structure will experience minimal deformation and rotation at this point, making it a critical location for load bearing and stability.

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