Transcript The GTSTRUDL Base Plate Wizard

GTSTRUDL
The GTSTRUDL
Base Plate Wizard
A Module for the Modeling and
Analysis of Base Plates
Rob Abernathy
CASE Center
GTSUG
June, 2008 Las Vegas, NV
GTSTRUDL
What is the Base Plate Wizard?
• Create a Finite Element model of the
base plate using SBHQ6 and SBHT6
elements.
• Model attachments, anchors, stiffeners
and bearing surface.
• Adjust the model with constraints and
cutouts.
• Add loadings by input, DBX files or
user-created files.
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What is the Base Plate Wizard?
• Print or Print Preview
• Save the base plate model in .gtbp
format
• Create a GTSTRUDL input file
• Run the input file from the dialog,
review the model and results in
GTMenu.
• Review results in the Wizard with data
sheets
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Running the Base Plate Wizard
• Will be available in
GTSTRUDL 30
• Graphical GUI
• Separate DLL
• Separate password
• ‘gtbp’ format files for
model recovery and
templates
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Wizard Organization
Menu bar
10 tabbed pages +
Additional dialogs
Display area
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Tabs: Plate
• Length units
• Overall dimensions
• Plate material
properties
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Tabs: FE Mesh
• Basic mesh size
• Mesh
adjustments
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Tabs: Attachments
• Add attachments
• Edit attachments:
double-click a column
• Delete attachments:
right-click a column
• ‘Mirrored’ option for
angles
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Tabs: Attachments – Add Attachment
• Select Table and
Profile
• Optional offset
• Optional rotation in
plane
• Modeling method
• ‘Edit Attachment’
uses same dialog
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Tab: Attachments – Supported Profiles
• Drop-down Table and Profile menus are user
controllable – add or remove
• Standard shapes are Wide Flanges, Tubes,
Channels, Tees, Angles, and Pipes
• All AISC hot rolled standard shapes are
supplied
• Users can add their own standard shapes or
“arbitrary” shapes – a collection of lines to
represent built up shapes, etc.
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Tabs: Anchors
• ‘Add Anchors’ to add
anchors to the base
plate.
• Select existing
anchors to edit or
delete
• Use ‘Edit Anchors’ to
review full anchor
data
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Tabs: Anchors – Add Anchors
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Tabs: Anchors - Location
• Type in coordinates of
anchors or use the Anchor
Patterns button for automatic
location calculation.
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Tabs: Anchors – Anchor Patterns
• Choose a pattern
• Enter offsets from plate edge
• Enter the number of any anchors in
between the corners
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Tabs: Anchors – Physical Properties
• Physical Properties are not required for
anchors specified with spring values.
• The ‘Coupler’ option allows for two
diameters for frame-type members
• ‘By reference’ will allow you to select from a
table of anchor properties. This table is user
generated.
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GTSTRUDL
Tabs: Anchors – Axial Stiffness
• Anchor can be modeled
as spring value or a
frame member
• Tension only option
• Pretension is available
for springs
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Tabs: Anchors – Shear Stiffness
• ‘Fixed’ restrains in
plane translation – no
effect on out-of-plane
displacement.
• ‘None’ means no
resistance to in plane
translations.
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Tabs: Anchors – Allowable Values
• Specified allowable values allow the BPW
to check results for anchors
Ratio  (Tact /Tallow )ea  (Sact /Sallow )es
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Tabs: Bearing Surface
• Choose spring
constant type: 1st two
use theory of
elasticity formula.
• Optional gap
between the base
plate and the bearing
surface.
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Tabs: Stiffeners
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•
•
•
•
No prototype available
Stiffeners are modeled as a single line
May be modeled as RIGID or FE extension
If extension, may have variable height
May be connected to an attachment.
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Tab: Constraints
• Prototype still under development.
• Constraints force nodes to lie on a line
or a point with optional supports.
• Add, (edit and delete) constraints.
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Tab: Constraints – Add Constraint
• Point or line
• Optional boundary
conditions
• Can be used to
facilitate modeling
issues outside of
Base Plate Wizard.
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Tabs: Constraint – Edit Restraints
• Select free or restraint type.
• Fixed + or – modeled with TEN/COMP
ONLY members with high axial
strength.
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Tabs: Cutouts
• Prototype still under development.
• A cutout is a closed polygon that is
excluded from the FE model.
• Cutouts can be used to model skewed
plates.
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Tabs: NL Springs
• Can be pre-loaded like
profiles
• Enter name (GTS
curve name)
• Optional description
• Can be assigned to
anchors or constraints.
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Tabs: Loadings
• Prototype still under development
• Type in data or read from files – DBX
(member forces or reactions) or .gtpbstyle files you create.
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Display
• Plate origin is red
square in lower, left
• Y axis is vertical, X is
horizontal, Z comes
out of the screen.
• Scales on left and
bottom
• Current element and
joint count at top
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Display
• Attachment centroid is marked with a small
cross in attachment color. This is the point
where loads are applied to an attachment.
• Anchor center is marked with small square –
if a diameter is specified, a circle is drawn in
anchor color.
• Stiffeners are drawn as a line in the stiffener
color.
• Constraints are drawn as a line with each
joint in the constraint marked with a small box
in the constraint color.
• Cutouts are outlined in the cutout color and
no elements are displayed inside the cutout.
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GTSTRUDL
Menu: File
• Create a GTSTRUDL input file based on the
current state
• Read an existing .gtbp file
• Create a .gtbp file
• Print the current display
• Launch the Scope Editor with the current
display
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Menu: Results
• If analysis and results are requested in
the input file, results can be reviewed
in the BPW
• Data sheet style format
• ‘Bearing surface’ uses the new LIST
PRESSURE command output
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Current Wizard limits
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10 Attachments
100 lines for each attachment
1000 Anchors
50 constraints
1 line per constraint
10 cutouts
10 lines per cutout
21 points in NLS curve
1 bearing surface K value
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