Used to specify rigid links or specialized linkages in the structure. This facility
can be used to model special structural elements such as ties or a floor diaphragm which makes
the floor rigid for in-plane movements. The process is to select a node to act as the control
and then degrees of freedom for which the dependent nodes are linked to the control.
Opens when Node is clicked on the Specifications - Whole Structure dialog.
Note:
STAAD.Pro is also capable of defining a rigid floor diaphragm
without the need to specify a
control
node. This feature is only available by
manually editing the STAAD input file. Refer to
TR.28.2 Floor Diaphragm for additional details
Control/Dependent tab
Note: Control / Dependent was formerly referred to as master /
slave.
| Setting |
Description |
| Control Node |
It is called as such because the displacements of the dependent
node will be based on the displacement of this control node.
From the drop-down list, select the node which should serve as the control
node.
|
| Dependent Directions |
-
Rigid - This is a means of defining that the link
which connects the control with the dependent has infinite stiffness for
all the six degrees of freedom. In other words, if one were to consider
an imaginary object that has infinite stiffness axially, for shear,
torsion and bending, that would be the type of link which connects the
control and the dependent.
Note: By default, STAAD.Pro keeps this box checked. Un-check
this box to activate the options described below.
-
XY, YZ, and
ZX - This is a way of specifying a type of
connection where the rigidity is limited to in-plane directions.
The plane of this link is defined in terms of the global
planes XY, YZ, or ZX. For example, if you have a concrete slab in a
building, and the slab can be assumed to be nearly inflexible for
translations along global X and global Z, and the rotation about global
Y, that type of link would be called a diaphragm in
global XZ.
XY is equivalent to a Control-Dependent relationship for the
degrees of FX, FY and MZ. Similarly, YZ is equivalent to linking FY, FZ
and MX, and, ZX is equivalent to linking FX, FZ and MY.
-
FX, FY,
FZ, MX,
MY, and MZ - This
provides a way for linking only the specific degrees of freedom you want.
|
Floor Diaphragm tab
| Setting |
Description |
| Diaphragm group |
| Setting |
Description |
| No |
Select diaphragm number. |
| Type |
Select the diaphragm type from the drop-down list:
Rigid - a diaphragm that translates & rotates as a rigid body.
|
|
| Floor Level group |
Select one of the options as the method to define the floor level of the diaphragm.
| Setting |
Description |
| Height |
Type the global coordinate value (elevation), in Y direction, to specify floor level. |
| YRange |
Select this option to define the floor level by upper and lower bounds of Y coordinates. |
Note: A single diaphragm may be defined at a given
level in STAAD.Pro.
|
| YRange group |
Used when the YRange option is selected.
| Setting |
Description |
| Minimum |
The lower bound of Y coordinates for the Y range. |
| Maximum |
The upper bound of Y coordinates for the Y range.
|
|
| Control Node Information group |
Select the method used to define the Control node of the
diaphragm.
| Setting |
Description |
| Calculate |
The diaphragm center of mass is determined and a node is
created at that location to use as the Control node. |
| Select Control Node |
Select the existing node to use from the drop-down list. |
|
| Define Floor Range |
Set this option to define the floor range as a XZ range of coordinates or by manually selecting coordinates. |