Loading classification:-
Sl. No. 
 | 
  
Type of
  load 
 | 
  
Plane of
  Cross Section 
 | 
  
Longitudinal
  Axis 
 | 
  
Centroidal Axis 
 | 
 
1 
 | 
  
Axial
  load 
 | 
  
Perpendicular
  to the plane of cross section 
 | 
  
Along
  the longitudinal axis 
 | 
  
Along
  the polar axis 
 | 
 
2 
 | 
  
ECC. Axial Load 
 | 
  
Perpendicular to the plane of
  cross section 
 | 
  
Parallel to the longitudinal axis 
 | 
  
Parallel to the polar axis  
 | 
 
3 
 | 
  
Transverse Shear Load 
 | 
  
Parallel
  to plane of cross section 
 | 
  
Perpendicular
  to longitudinal and passing through longitudinal axis 
 | 
  
Perpendicular
  to poplar axis and passes through centroid of that cross section 
 | 
 
4 
 | 
  
ECC. TSL 
 | 
  
Parallel to plane of cross section 
 | 
  
perpendicular to longitudinal but
  away from longitudinal axis 
 | 
  
Perpendicular to polar axis but
  away from centroid axis of cross sections 
 | 
 
5 
 | 
  
Bending
  Couple 
 | 
  
Perpendicular
  to the plane of cross section 
 | 
  
Along
  longitudinal al axis 
 | 
  
Acts
  about either horizontal or vertical to centroidal axis 
 | 
 
6 
 | 
  
Twisting Couple 
 | 
  
Parallel to plane of cross section 
 | 
  
Perpendicular to the longitudinal
  axis 
 | 
  
Act about the polar axis 
 |