positive and negative shear diagram

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fmflora1989

March 12, 2023 21:13

In the simplest uniformly distributed load shear diagram, I'm very confused that at a perfect symmetrical condition, why the shear force has a positive and negative direction on either end. I would think the forces should be mirrored from the mid point. Can anyone help me understand?

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  rebekkak March 28, 2023 13:55 (Edited March 28, 2023 13:55)

  Hi Mengfan,

  Shear is like slicing - one part up and one part down.  Cut a piece of card stock with scissors and look at the scissor and the cut it leaves closely.  One side will be bent downwards.

  Hope this helps.

  Rebekka O'Melia, R.A., NCARB, B. Arch, M. Ed, NOMA, Step UP ARE 5.0 Courses

   

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  rebekkak March 29, 2023 13:07

  Yes, it's important to understand that these force diagrams represent magnitude and direction.

  Rebekka O'Melia, R.A., NCARB, B. Arch, M. Ed, NOMA, Step UP ARE 5.0 Courses

   

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  Khuyen Phan April 02, 2023 19:52

  

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  Khuyen Phan April 02, 2023 19:55

  the square piece of material experiencing the shear force.

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