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STAAD Commands and Input Instructions
Section 5
5-112
5.22.3 Element Ignore Stiffness
Purpose
Structural units like glass panels or corrugated sheet roofs are
subjected to loads like wind pressures or snow loads. While these
units are designed to carry those loads and transmit those loads to
the rest of the structure, they are not designed to provide any
additional stiffness to the structure. One way to handle the
situation is to not input the unit as part of the structural model, and
apply the load using load generation techniques like AREA LOAD
or FLOOR LOAD.
STAAD provides another way of handling such units. This is
through the help of the ELEMENT IGNORE STIFFNESS
command. To use this feature, the glass panel or roof unit must be
defined using plate elements. The IGNORE STIFFNESS command
enables one to consider the unit just for the purpose of application
of load, while its stiffness will not be considered during the
assembly of the stiffness matrix. In other words, it is like an
INACTIVE member which is active for load application but
INACTIVE for stiffness.
General Format:
IGNORE STIFFNESS
{
}
ELEMENT element-list
Example
IGNORE STIFFNESS ELEMENT 78 TO 80