Strength of Material (General Engineering) (SSC JE)

In this figure point A is identify higher strength is more brittle concrete is stress-strain curves for concrete. This is a graphical representation of concrete behaviour under load. If strength will be high ductility will be low.

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.

Bending moment–The bending moment at any section is the algebraic sum of the moments of the forces about the section, again taken on either side.

• Shape of the shear force diagram is a linear and shape of the bending moment diagram is a parabolic.
Note–
• The bending moment is maximum where shear force diagram changes sign from positive to negative or vice versa in other words the bending moment is maximum at a point where shear force is zero.

Mohr's circle is the locus of points representing magnitude of normal and shear stress at various plane in a given stress element.

• Radius of mohr circle represent the value of maximum shear stress.
• Normal stress on the plane of maximum shear stress is represented by coordinate of center of mohr circle.
• Mohr circle reduce to a point in case of hydrostatic loading and zero shear. In case of pure shear, center will fall at origin.