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STAAD Commands and Input Instructions
Section 5
5-258
5.32.3.3 Element Load Specification - Joints
Purpose
This command may be used to specify various types of element
like loads for joints. Three or four joints are specified that form a
plane area; pressure is specified for that area; then STAAD
computes the equivalent joint loads. This command may be used
as an alternative or supplement for the Area Load, Floor Load, and
the other Element Load commands.
General format:
ELE
MENT LOAD JOINTS
i
1
(by i
2
) i
3
(by i
4
) i
5
(by i
6
) i
7
(by i
8
) FACETS –
⎧
GX ⎫
j
1
PRESSURE ⎨ GY ⎬ f
1
f
2
f
3
f
4
⎩
GZ
⎭
If this data is on more than one line, the hyphens must be within the joint data.
Description
f
1
f
2
f
3
f
4
…Pressure values at the joints for each 3 or 4 joint
facet defined. Only f
1
needs to be specified for uniform pressure.
In any case the pressure is provided over the entire element.
The PRESSURE may be provided either in GLOBAL (GX, GY,
GZ) directions or in local Z direction (normal to the element). If
the GLOBAL direction is omitted, the applied loading is assumed
to be in the local Z direction as if the joints defined a plate. The
loads are proportional to the area, not the projected area.
There will be j
1
facets loaded. The first facet is defined by joints
i
1
i
3
i
5
i
7
then each joint number is incremented by the BY value
(1 if omitted).