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General Description
Section 1
1-30
Please note the following few restrictions in using the finite
element portion of STAAD:
1) Members, plate elements, solid elements and surface elements
can all be part of a single STAAD model. The MEMBER
INCIDENCES input must precede the INCIDENCE input for
plates, solids or surfaces. All INCIDENCES must precede
other input such as properties, constants, releases, loads, etc.
2) The selfweight of the finite elements is converted to joint
loads at the connected nodes and is not used as an element
pressure load.
3) Element stresses are printed at the centroid and joints, but not
along any edge.
4) In addition to the stresses shown in Fig 1.18, the Von Mises
stresses at the top and bottom surface of the element are also
printed.
Plate Element Numbering
During the generation of element stiffness matrix, the program
verifies whether the element is same as the previous one or not. If
it is same, repetitive calculations are not performed. The sequence
in which the element stiffness matrix is generated is the same as
the sequence in which elements are input in element incidences.
Therefore, to save some computing time, similar elements should
be numbered sequentially. Fig. 1.14 shows examples of efficient
and non-efficient element numbering.