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The GTSTRUDL Base Plate Wizard

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. What is the Base Plate Wizard?. Create a Finite Element model of the base plate using SBHQ6 and SBHT6 elements.

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The GTSTRUDL Base Plate Wizard

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  1. 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

  2. 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. GTSUG June, 2008

  3. 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 GTSUG June, 2008

  4. 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 GTSUG June, 2008

  5. Wizard Organization Menu bar 10 tabbed pages + Additional dialogs Display area GTSUG June, 2008

  6. Tabs: Plate • Length units • Overall dimensions • Plate material properties GTSUG June, 2008

  7. Tabs: FE Mesh • Basic mesh size • Mesh adjustments GTSUG June, 2008

  8. Tabs: Attachments • Add attachments • Edit attachments: double-click a column • Delete attachments: right-click a column • ‘Mirrored’ option for angles GTSUG June, 2008

  9. Tabs: Attachments – Add Attachment • Select Table and Profile • Optional offset • Optional rotation in plane • Modeling method • ‘Edit Attachment’ uses same dialog GTSUG June, 2008

  10. 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. GTSUG June, 2008

  11. 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 GTSUG June, 2008

  12. Tabs: Anchors – Add Anchors GTSUG June, 2008

  13. Tabs: Anchors - Location • Type in coordinates of anchors or use the Anchor Patterns button for automatic location calculation. GTSUG June, 2008

  14. Tabs: Anchors – Anchor Patterns • Choose a pattern • Enter offsets from plate edge • Enter the number of any anchors in between the corners GTSUG June, 2008

  15. 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. GTSUG June, 2008

  16. Tabs: Anchors – Axial Stiffness • Anchor can be modeled as spring value or a frame member • Tension only option • Pretension is available for springs GTSUG June, 2008

  17. Tabs: Anchors – Shear Stiffness • ‘Fixed’ restrains in plane translation – no effect on out-of-plane displacement. • ‘None’ means no resistance to in plane translations. GTSUG June, 2008

  18. Tabs: Anchors – Allowable Values • Specified allowable values allow the BPW to check results for anchors GTSUG June, 2008

  19. Tabs: Bearing Surface • Choose spring constant type: 1st two use theory of elasticity formula. • Optional gap between the base plate and the bearing surface. GTSUG June, 2008

  20. Tabs: Stiffeners • 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. GTSUG June, 2008

  21. 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. GTSUG June, 2008

  22. Tab: Constraints – Add Constraint • Point or line • Optional boundary conditions • Can be used to facilitate modeling issues outside of Base Plate Wizard. GTSUG June, 2008

  23. Tabs: Constraint – Edit Restraints • Select free or restraint type. • Fixed + or – modeled with TEN/COMP ONLY members with high axial strength. GTSUG June, 2008

  24. 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. GTSUG June, 2008

  25. Tabs: NL Springs • Can be pre-loaded like profiles • Enter name (GTS curve name) • Optional description • Can be assigned to anchors or constraints. GTSUG June, 2008

  26. Tabs: Loadings • Prototype still under development • Type in data or read from files – DBX (member forces or reactions) or .gtpb-style files you create. GTSUG June, 2008

  27. 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 GTSUG June, 2008

  28. 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. GTSUG June, 2008

  29. 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 GTSUG June, 2008

  30. 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 GTSUG June, 2008

  31. Current Wizard limits • 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 GTSUG June, 2008

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