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
Draw the P-h and T-S diagram for the vapour compression cycle when the vapour after compression is : (i) wet region (ii) dry saturated

Which chromium plating is more eco-friendly - trivalent or Hexavalent? Justify your answer in the light of environmental issues caused.

Micrometer (or Screw Gauge): There are two different types of micrometers - inside and outside micrometers. A micrometer also has two scales - Main scale and Vernier scale (Figure

Service duty point: 3 m3/h Backwash duty point: 9 m3/h Part (a) What is the speed of the pump to achieve the service and backwash flow rates ? Part (b) What would be the best

Describe method of deliberately placing column from centre in footing. The method of deliberately placing a column away from the centre of the footing so that resulting soil pr

do you know the grade to the answers of the questions in the pre paid solutions..?? and what if the answers are wrong..?? as i need all working out shown

The progressive liberalization of the norms for foreign investment and import of technology appear to have benefited the automobile sector with production of total vehicles increa

Write short notes on following terms:- (i) Total quality management (ii) Method study (iii) Selective Inventory Control (iv) Break Even analysis (v) Merits Rating an

Problem A cat walks along a uniform plank that is 5.00 m long and has a mass of 9.00 kg.  The plank is supported by two sawhorses, one 0.500 m from the left end of the board a