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Tech Tip: Field Bolt AssociationApril 24, 2013
It can sometimes be confusing which member detail and BOM field bolts will be associated with when they are manually added or added through processing a non-system connection in SDS/2.
In Fabricator Options – Bolt Detailing/Fabrication Options, the option Field bolts listed on which members: will, in most situations, determine which member the field bolts are associated with.
There are some scenarios (detailed below) in which this setup option does not control or handle the situation, so it is up to the user to know how this behaves to achieve the required results.
Process and Create Solids
Process and Create Solids has the ability to match holes and add bolts to user-created materials. If SDS/2 cannot determine which member is the supported and which is the supporting, the field bolts will be associated with the member with the lower member number of the two.
In Figure 1, an end plate was manually added to each beam for a splice connection and holes were added to the material on B_135. If Process and Create Solids is used to automatically match holes and add bolts, SDS/2 cannot determine which member is the supported or supporting. In this scenario, the field bolts would be associated with  B_135, since that member has a lower member number.
One easy way to determine which member the field bolts are associated with in the model is by turning one of the members to stick. If the bolts are still visible, this means they are associated with the solid member. If they are not visible, they are associated with the member that is turned to stick (see Figure 2).
In Figure 3, during Process and Create Solids it can be determined that B_137 is the supported member; therefore, during Process and Create Solids, SDS/2 will associate the field bolts with B_137 based on the setup mentioned earlier.
To change which member has the bolts associated with it, users can manually add bolts via Bolt Add.
Using Bolt Add
When manually adding bolts via Bolt Add, the first member selected will be the member the field bolts are associated with. In Figure 4, the bent plate member was selected first, and therefore, the field bolts will be listed with it.