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Resisting pure bending

  1. Aug 10, 2016 #1
    1. The problem statement, all variables and given/known data
    to resist the bending, there must be reaction force(blue) act against the applied force(red), the reaction force that resist bending is the longitidunal normal force , right?
    why the author stated it as longitidunal shear force, is it wrong?

    2. Relevant equations


    3. The attempt at a solution
    longitidunal shear force is the green colour arrow, right? how could the force resist the bending?
     

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  2. jcsd
  3. Aug 11, 2016 #2

    haruspex

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    Your own diagram is inaccurate in several ways.
    The set-up is a beam fixed at one end, with a transverse load applied at the other, not in the middle. There is no source of a force to provide the support you show in blue.
    You do not show any forces where the beam is fixed. These forces will consist of a vertically upward force to balance the load, plus a torque to balance the moment of the load. This torque is transmitted in the form of the longitudinal shear forces.
     
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