D3.C.3 Structural Model
Structural slabs that are to be designed to BS8007 must be modeled using finite elements.
Refer to G.5 Finite Element Information for information on the sign convention used in the program for defining elements.
It is recommended to connect elements in such a way that the positive local z axis points
outwards away, from the center of the container. In this manner the Top
of elements
will consistently fall on the outer surface and internal pressure loads will act in the
positive direction of the local z axis.
An example of a rectangular tank is provided to demonstrate the above procedure.
Element properties are based on the thickness given under ELEMENT PROPERTIES
command. The following example demonstrates the required input for a 300 mm slab modeled with ten elements.
UNIT MM
ELEMENT PROPERTIES
1 TO 10 THI 300.0