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Moment-beam under bending momen?

  1. Sep 9, 2005 #1
    A beam is under bending. Let us take a small part of a beam with length x. It has end A and end B. At end A the bending moment is M1 & shear force is S1 and at end B the bending moment is M2 & shear force is S2.
    Let me take the moment equilibrium for this element about B.


    I need clarity in adding M1 in the above equation. Actually M1 acts with A as the centre. But why this is included while taking moment about B.
  2. jcsd
  3. Sep 9, 2005 #2


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    Last edited by a moderator: Apr 21, 2017
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