Question

Difference between symmetric and unsymmetric bending of beams'

Answer 1

The cross section is symmetric about both the y. This i s the case of so called symmetrical bending. The fact that the beam cross section is symmetric about the vertical plane insurers that the two principal centroidal axes are vertical and horizontal. This is a case of unsymmetric bending

Answer 2

If the bending moment design with regard to the center point is proportional then it is described as symmetrical bending.

For example, commonly sustained beam placed with UDL on its complete length is an illustration of symmetrical bending.

Similarly, if the bending is not proportional with regard to the center point then it is described as symmetrical bending.

ex. commonly sustained beam packed with the half-length of UDL from one point to the center is an illustration of unsymmetrical bending.