Transcript Using the Base Plate Wizard

GTSTRUDL
Using the GTSTRUDL Base
Plate Wizard
Example of Creating and
Analyzing a Base Plate
Rob Abernathy
CASE Center
GTSUG
June, 2009 Atlanta, GA
GTSTRUDL
Ex_1: Simple W on rectangular plate
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Start the Base Plate Wizard
The Base Plate Wizard will not start
unless you have a separate license for it.
This extra password can be put in the
regular GTSTRUDL password file.
Documentation for the Base Plate Wizard
is available through the Help ->
Reference Manuals menu pick in
GTSTRUDL, or the Help menu pick in the
Base Plate Wizard.
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The Plate Page
Use the Plate tab to
enter the plate
dimensions: height,
width and thickness.
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The Attachment Page
The Attachment page will list
all the attachments to the plate.
There is a limit of 25 separate
attachments.
From this page you can add,
change or delete attachments.
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The Attachment Page – Add Attachment
When you click the ‘Add Attachment’
button, this dialog pops up.
Select the Table ‘WSHAPES9’
Select the Profile ‘W10x45’
You can translate and rotate the
attachment footprint, but for this
example, the default values of centered
and 0.0 rotation are correct.
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Attachments – Create your own
The Attachment file
determines the Tables
and Profiles available in
the Add Attachment
dialog. You can create
your Attachment file with
just the profiles you
need, or create an
Attachment file with
custom profiles, e.g.
non-AISC shapes, beam
seats, etc.
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Attachments – Create your own (cont)
When you select a new Attachment file,
you will be offered a choice of how deal
with the existing Attachment file.
‘Add’ leaves the data from the current
Attachment file and adds data from the
new Attachment file, in effect combining
the two Attachment files.
NOTE: By default, all of the
ASD 9th Edition shapes except
for double angles are
included, so it is likely you will
want to create a custom
Attachment file.
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‘Replace’ clears the data from the current
Attachment file, leaving only the data
from the new Attachment file.
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Attachments – Create your own (cont)
• Refer to Appendix A2 in the Base Plate
Wizard Documentation for more information
about creating attachments.
• You can create as many Attachments files as
you need and change between them with the
Options – Attachment file menu pick.
• See the sample Attachment files in
C:\Program Files\GTStrudl\30\BasePlate
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The Anchors Page
The Anchors page displays a
summary of each anchor, with
its location, diameter and type
description. Use the Edit
Anchors button for a detailed
description of an anchor.
Add Anchors:
Add new anchors to the base plate. Add as many as
you need, but they all must have the same properties,
i.e. diameter, axial stiffness, etc.
Edit Anchors:
Select anchors, then click this button. Only edit
anchors with the same properties together.
Delete Anchors: Select anchors, then click this button.
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Add Anchors
The Add Anchors dialog is where
you describe the plate anchors.
You must specify anchor location,
axial properties and shear
properties.
The Anchor Patterns button helps
to place anchors that are
arranged in a symmetrical
pattern.
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Add Anchors (cont)
Shear properties include:
Fixed – anchor shear is calculated from
the reactions.
Elastic spring – KFX and KFY
Nonlinear spring – Use a specified
NLS
None – this is only appropriate for an
anchor modeled as a frame member, or
with a shear lug (modeled as a
constraint) or some other applied
constraint.
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Add Anchors (cont)
If you want to have the Results Summary check the anchor
results, enter the Allowable Values. This is not a check by
ACI 318 Appendix D.
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Anchor Patterns
The Anchor Patterns dialog can add as many anchors as you
like. The ‘X’ and ‘Y’ values are how far to come in from each
corner to place the corner anchors. ‘Top/Bot’ is how many
anchors to evenly space between the corner anchors in the X
direction. ‘Sides’ is how many anchors to evenly space
between the corner anchors in the Y direction.
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The Bearing Surface Page
The bearing surface page is used to
specify the stiffness of the surface
under the base plate. Concrete of
4000 psi is assumed. If the base
plate is elevated, check the “No
bearing surface support” radio
button, but be sure your anchors
provide a stable support system,
such as anchors modeled as frame
members.
Tip: When you want to check the
geometry in GTMenu for a complex
base plate before analysis, set the
type to “No bearing surface…” until
you verify the model. This will
simplify viewing the base plate in
GTMenu.
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Check Geometry in GTMenu
Remember to check the “Process
Input File..” box. After OK – you will
see the input file running and
generating output – the View -> View
in GTMenu pick will be activated.
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Check Geometry in GTMenu (cont)
In GTMenu, you can verify that the generated geometry is appropriate.
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The Loading Page
The Loading page allows you to enter
or review the loads to be applied to the
base plate attachments. Loadings can
be directly typed in, or they can be
read from a file.
Files may be created by you in the
specified Base Plate Wizard format
(see Section 9.1, Case 1), or they can
be Joint or Member results DBX files.
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Loadings (cont)
As an example, read the
member end forces from the
start of member 1 to be
applied to attachment 1.
When the OK button is
clicked, the specified DBX
file is read, results for
member 1 extracted, and
then added into the load
data dialog, as shown.
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Analyze and Check Results
When the base plate data is
complete with attachments,
anchors, bearing surface and
loads, you are ready to analyze.
Pick the File -> Write GTSTRUDL
input file selection again. Note
that the analysis box is now
available since loads exist.
When you click OK, an input file
created and send to be
processed. This can take a while,
depending on model size and
number of loads.
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Results Menu
After an analysis has
been performed, the
Results menu will be
activated.
The Results Summary is a quick way to check the
status of the base plate. Select the type of data to
include in the Summary and then click the OK button.
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Results Summary
If Allowables have been
specified, each type of
result will be marked Pass
or Fail.
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Exit Base Plate Wizard
Upon exiting the Base Plate Wizard, if it detects
you have made changes, you will be prompted to
save the changes in a Georgia Tech Base Plate
(.gtbp) file.
This file is a text file whose format is defined in
Appendix A1.
You can explicitly save this file at any time with the
File -> Save to .gtbp menu pick.
You can restore a previously saved base plate with
the file -> Restore from .gtbp menu pick.
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Input file
The Base Plate Wizard creates a GTSTRUDL input file that remains
after the Wizard is closed.
The input file begins with a header summarizing the base plate
components.
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Input file (cont)
Next come the JOINT COORDINATES, ELEMENT INCIDENCES and
ELEMENT PROPERTIES.
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Input file (cont)
Attachments come next. Notice the creation of a RIGID BODY
master node ‘C1’. This is where loads applied to the attachment
are placed. If the attachment is modeled as an extension (2D
elements extending in the Z+ direction) the RIGID BODY will be
created at the end of the extension.
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Input file (cont)
Comments are added with K (bearing surface stiffness) calculation
information. See the Base Plate Wizard documentation for more
information and the equation used to calculate K. Then nonlinear
springs are created for each joint, much like CALCULATE SOIL
SPRINGS does.
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Input file (cont)
Anchors are
modeled as springs
(elastic or NLS) or
support conditions
at the node in the
center of the
anchor.
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