To automatically model a support using foundation
parameters, use the following procedure.
Isolated footing
dimensions and subgrade modulus values are specified in the current input
units. You may want to change those to a convenient value before specifying a
foundation support.
STAAD.Pro can take foundation parameters for
footings or mat foundations and automatically model spring supports.
-
Select the nodes that will have the same support condition.
-
On the
Specification ribbon tab, select the
Foundation tool in the
Supports group.
The
Create Support dialog opens to the
Foundation tab.
-
Select the
Foundation type to model:
-
Footing - a rectangular, isolated footing
(i.e., spread footing) area is used to model spring stiffness using the
subgrade modulus
-
Elastic
Mat - the program calculates the influence area of the load and
then calculates a spring stiffness based on this area using the subgrade
modulus
-
Plate
Mat - the program calculates the influence area of the load within
a specified plate and then calculates a spring stiffness based on this area
using the subgrade modulus
-
Select the
Direction of the resistance of the spring
supports.
The directions X, Y, or Z generate a spring in that global
direction. The other two global directions are fixed against translation and
moment about the selected direction is also fixed. The directions X Only, Y
Only, or Z Only generate a spring in that global direction only.
-
Type the
Subgrade Modulus of the soil.
- Optional:
For
Elastic Mat or
Plate Mat foundation types, check the option
Print influence area of each joint to include
this information in the output.
- Optional:
For
Elastic Mat or
Plate Mat foundation types, select a nonlinear
spring option if necessary:
Option | Description |
---|
None |
linear springs are generated |
Compression Only |
generated springs are compression only (made inactive if in
tension) |
Multi-Linear |
generated springs can have a multilinear
displacement-spring constant curve associated with the mat foundation
|
Tip: Multilinear springs must be specified using the
STAAD Editor. The dialog box cannot accept
displacement-spring constant curve data.
-
Either:
To… | Do the following… |
---|
add the support type to the
model and assign to the current node selection |
click
Assign. |
add the support to the
model for later assignment |
click
Add. |
The dialog closes.