Add simple connection resistances to the database

Added September 16, 2020 by Tekla User Assistance tekla.documentation@trimble.com

Software version: 
Tekla Structural Designer 2020

Add simple connection resistances to the database

Add simple connection resistances to the database

The materials database contains pre-defined connection types with pre-defined resistances for steel beams to Eurocode1 and US2 head codes.

In addition, you can specify user-defined connection types and user-defined resistances for any head code and save them to the section database. Once defined, these can then be used to Check simple connection resistance across all projects.

1The Eurocode resistances are derived from SCI publication P358 and make use of UK NA values for partial safety factors, regardless of the Eurocode Country setting.

2 The US resistances are derived from AISC publication Steel Construction Manual 14th Ed and are only given when US Customary units are selected. Separate resistances are given for LRFD and ASD.

Pre-defined connection types and resistances

For Eurocodes:

With the Member Type set to Simple Beam, three pre-defined connection types are available for S355 and S275 grades:

  • Fin Plates,
  • Full Depth End Plates
  • Partial Depth End Plates

These have connection resistance values defined for UB and UKB section beams. The bolts considered are all size M20, of property class 8.8, and ordinary or flowdrill type. The plates considered are all S275 grade. Fin Plates and Partial Depth End Plates have resistances defined for beams with 0, 1 or 2 notches, while the resistances for Full Depth End Plates assume no notches. Fin Plates have resistances for 1 or 2 vertical lines of bolts.

For US (ACI/AISC) and US Customary units:

With the Member Type set to Simple Beam, and the steel grade set to 'Any' one pre-defined connection type is available:

  • Single Plate

Single Plates have connection resistance values defined for W section beams of any Fy value. The bolts considered are sizes 3/4 in, 7/8 in and 1 in, from Group A, with thread condition N, in standard holes. The plates considered are all of Fy 36 ksi, with thickness ranging from 1/4 in to 9/16 in. Single Plates have resistances defined for beams with no coping and top flange coping only. All resistances assume 1 vertical line of bolts only.

In addition, two further Simple Beam connection types are available for the 50 ksi grade:

  • All-Bolted Dbl Angle,
  • Shear End-Plate

These have connection resistance values defined for W section beams, and for Single Plates with W section beams of Fy 50 ksi. The bolts considered are sizes 3/4 in, 7/8 in and 1 in, from Group A, with thread condition N, in standard holes. The plates and angles considered are all of Fy 36 ksi, with thickness ranging from 1/4 in to 9/16 in. All-Bolted Double Angles have resistances defined for beams with no coping and top flange coping only, while the resistances for Shear End-Plates assume no coping. All resistances assume 1 vertical line of bolts only.

Note: The pre-defined connection types and resistances can be reviewed in the Connection Resistance dialog.

Add user-defined connection types

  1. Open the Connection Resistance dialog
  2. Under Connection Types, click Add...

    An Add Connection Type dialog appropriate to the current headcode is displayed.

  3. In the Name box enter a name for the Connection Type.

    If you want to create a Connection Type with a number of variations of Grade, Notches or Bolt Lines then it is important to enter exactly the same Name each time - e.g. the database will recognise “CT1” and “CT 1” as separate Types simply because of the space in the second name. This has an effect when viewing results in tabular data or reports, where Tekla Structural Designer carries out an optimisation process to find the first passing resistance based on the name of the Connection Type and the number of Bolt Lines and Bolt Rows assigned to that name

    Note: It is possible to use the same Name as one of the pre-defined Types and it will be recognised in the optimisation process as essentially being the same Connection Type
  4. In the Note box enter any descriptive text you would like to see displayed in the dialog’s Info box.
  5. Select a Grade or, with US codes, an Fy value.

    Note that subgrades like S355 J0 are ignored e.g. a Connection Type with S355 Grade assigned will have its resistances applied to beams or braces of Grade S355 J0, S355 J2, etc.

  6. Select # Notches and # Bolt Lines or, with US codes, select Coping, # Bolt Lines, Bolt Diameter and Thickness (of plate or angle leg).
  7. Select the section lists that you will want to define resistances for (this list can be added to later on if required, in the Edit Connection Type dialog).
  8. Click OK
    Note: OK is not active until a Name has been defined. After clicking OK ‘Hide undefined values’ becomes automatically un-ticked and resistance values can be entered against the required sections. If no resistance values are assigned at this stage for at least one section in a selected Section List, then that List will become de-selected and have to be re-selected later on.
You are now able to add user-defined connection resistances to the database against the required sections for this connection type.

Edit user-defined connection types

The Edit... Connection Type button is only active when a user-defined Type is selected. When the Edit Connection Type dialog opens, its boxes are populated with the currently selected Type Name and current values of the filters.
  1. Open the Connection Resistance dialog
  2. Under Connection Types, click Edit...

    An Edit Connection Type dialog appropriate to the current headcode is displayed.

  3. Edit the values as required.
  4. Click OK

Add user-defined connection resistances

User-defined connection resistances can be added to the database for existing connection types as follows:

  1. If it is not already displayed, open the Connection Resistance dialog
  2. If necessary, use the filters at the top of the dialog until the required connection is displayed in the Connection Types list.
  3. Select the connection in the Connection Types list. The sections are listed in the Resistances table, along with the bolt rows and resistance values for the selected connection type.
    Note: If no sections are listed uncheck Hide undefined values.
  4. Select the section type in the Section List.

  5. Resistance values can be entered directly in the table. Alternatively, select a particular section in the table and click Edit.... This displays the Edit resistances dialog which allows you to adjust the bolt rows count or to Add multiples of the same section size with more than one bolt row count. The bolt row counts can be entered in any order and then use Sort to number from lowest to highest. Use the Edit resistances dialog also to Delete data rows if no longer required in your database.
    Note: Connection resistances are made active as the values are entered.
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