Shell surface loads

There are five types of surface loads for shells:

1.      Global shell load

2.      Global projected shell load

3.      Local shell load

4.      Triangular load

5.      Hydrostatic load

In all the cases the pressure applied is given in Newton/meter2 in default units. In the global load, the load is given related to the global axes. The global projected load is given also in global axes but the area considered of the shell is orthogonal to the load. Local load is related to the local axes defined in the properties section. A load of  (0,0,-P) N/m2 in either case would be (for a shell of length L and width W):

 

 


Triangular load is like a Global shell load but with a triangular variation in its values. It is defined by two points, given by its coordinates, and pressure values associated to each one of these points. The pressure assigned to the elements that project between the points is a linear interpolation between the two values. The elements that project outside have a pressure value of zero.

Example:

Hydrostatic load is defined related to the gravity direction entered in the problem data section. The reference coordinate is related to that direction. Self-weight water is given, in default units as N/m3.