What is shear force?
It is defined as the algebraic sum of forces acting either on left hand side or right hand side of the section.
Conventional sign for shear force
What is bending moment?
It is defined as the algebraic sum of moments of forces acting on the left hand side or right hand side of the section.
Conventional sign for bending moment
Important points to be noted while drawing shear force and bending moment diagram.
(i) length of shear force and bending moment span must be equal.
(ii) shear force diagram is drawn
below the loaded beam and bending moment diagram is drawn below shear force diagram.
(iii) for simply supported beam, bending moment is zero at the supports.
(iv) for cantilever beam bending moment will be zero at free end.
(v) calculate shear force and bending moment at all critical points.
(vi) if no load is present between two points then shear force will be constant.
https://youtu.be/M-kjJaNWqRs
It is defined as the algebraic sum of forces acting either on left hand side or right hand side of the section.
Conventional sign for shear force
It is defined as the algebraic sum of moments of forces acting on the left hand side or right hand side of the section.
Conventional sign for bending moment
(i) length of shear force and bending moment span must be equal.
(ii) shear force diagram is drawn
below the loaded beam and bending moment diagram is drawn below shear force diagram.
(iii) for simply supported beam, bending moment is zero at the supports.
(iv) for cantilever beam bending moment will be zero at free end.
(v) calculate shear force and bending moment at all critical points.
(vi) if no load is present between two points then shear force will be constant.
https://youtu.be/M-kjJaNWqRs
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