Shear force and bending moment diagram, Mechanical Engineering

Shear force and bending moment diagram:

How can you draw a shear force and bending moment diagram.

Sol.: In these diagrams, the Shear Force or bending moment are represented by ordinates while the length of the beam represents abscissa. The following are important points for drawing shear force and bending moment diagrams:

1.  Consider left or right side of portion of the section.

2.  Add the forces normal to the beam on one of the portion. If right portion of section is chosen, force on right portion acting downwards is positive while force acting upwards is negative.

3.  If the left portion of the section is chosen, a force on left portion acting upwards is positive while force acting downwards is negative.

4.  The positive value of shear force and bending moment are plotted above the base line, and negative value below the base line.

5.  The Shear Force diagram will increase or decrease suddenly that is by a vertical straight line at a section where there is a vertical point load.

6.  In drawing Shear Force and bending moment diagrams no scale is to be chosen, but the diagrams should be proportionate.

7.  For drawing Shear Force and bending moment diagrams, the reaction of the right end support of a beam need not be determined. If however, reactions are wanted particularly, both the reactions are to be determined.

8.  The Shear force between any two vertical loads will remain constant. Hence the Shear Force diagram will be horizontal. The bending moment the diagram is inclined between these two loads.

9.  For UDL Shear Force diagram will be inclined straight line and the bending moment diagram will be curve.

10. The bending moment at the two supports of a simply supported beam and at the free end of a cantilever will be zero.

11. The bending moment is highest at the section where Shear Force changes its sign.

12. In case of overhanging beam, the maximum bending moment will be least possible when negative max. Bending moment is equal to the negative maximum Bending moment.

13. If not mentioned particularly, self weight of the beam is to be neglected.

14. Section line is draw between that points on which load acts.


Posted Date: 10/20/2012 1:28:57 AM | Location : United States

Related Discussions:- Shear force and bending moment diagram, Assignment Help, Ask Question on Shear force and bending moment diagram, Get Answer, Expert's Help, Shear force and bending moment diagram Discussions

Write discussion on Shear force and bending moment diagram
Your posts are moderated
Related Questions
Determine the increase in pressure in vessel: A thin spherical vessel of diameter 750 mm & wall thickness 8 mm is filled through water at atmospheric pressure. Determine the i

The body, suspension and engine mounting system of a vehicle may be idealised as a three degree of freedom system consisting of a bar of mass 1400 kg and the centre of mass at G, 1

Q. Can you implement Compatibility test ? This test indicates the decrease in height of a mass of sand in a specimen tube with respect to its original height, under the actio

We have a reciprocating compressor operating at 800 rpm.  Suction pressure and discharge pressure are held constant by other systems that have nothing to do with the compressor.  W

Draw bending moment diagram for the beam: A cantilever beam carries a uniformly distributed load of 2 t/m over the total length of 6 m and point loads of 5 t, 3 t, 7 t & 2 t a

Objectives After studying this unit, you should be able to explain various procedures in service and maintenance, and appreciate the importance of the inspections


(a) The following forces (all pull) act at a point : (6) (i) 20 N North-East (ii) 25 N due North (iii) 20 N 30o East of South (iv) 15 N due East (v) 30 N 60o South o

Explain Wilson HArtnell Governor