Table of Contents
Why does the bending moment becomes Max Min at zero shear force?
The maximum bending moment occurs in a beam, when the shear force at that section is zero or changes the sign because, at point of contra flexure the bending moment is zero. Explanation: The positive bending moment in a section is considered because it causes convexity downwards.
Where the bending moment is maximum the shear force is?
Bending moment is maximum where shear force is zero or its changes sign (positive to negative or vice-versa).
When shear force is zero at a point the bending moment at that point is?
The point where the bending moment changes sign (or zero) is known as point of contraflexure. This point generally occurs in overhanging beams.
Why is bending moment not zero at supports in a continuous beam?
In a continuous beam, the section at the inner support is not allowed to freely rotate. It can very well resist the rotation and hence develop bending moment as a result.
What is the difference between shear and bending moment?
Shear force At any section in a beam carrying transverse loads the shearing force is defined as the algebraic sum of the forces taken on either side of the section. Similarly, the bending moment at any section is the algebraic sum of the moments of the forces about the section, again taken on either side.
Which side of the beam should the bending moment be taken?
Ans: The bending moment can be taken on any side of the beam. It is generally preferred that If we start calculating Bending Moment from the Left side or Left end of the beam, Clockwise Moment is taken as Positive and Counter Clockwise Moment is taken as Negative.
How does point C affect the shear force diagram?
It has absolutely no effect on the shear force diagram. You can just ignore point C when drawing the shear force diagram. When drawing the bending moment diagram you will need to work out the bending moment just before and just after point C: Just before: bending moment at C = 3·30 – 1·40 = 50Nm
How is the shear force of a beam calculated?
The shearing force at any section of a beam is the algebraic sum of the lateral components of the forces acting on either side of the section. Where forces are neither in the lateral or axial direction they must be resolved in the usual way and only the lateral components are used to calculate the shear force. Bending Moments