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Navigate to Superstructure > Boundary Conditios > Bearing Fixity

Select the first cell in the "Insertion Point" column, and then click on the "Pick" button in the resulting window.

Choose the insertion points that will define the boundary conditions for the superstructure. For each location, specify the fixities or stiffness values based on the bearing types in the Tx, Ty, and Tz directions.

Select the insertion points for each bearing.

Set Tx/Ty/Tz/Rx/Ry/Rz as in the figure.
To determine the Tx and Ty stiffness values, compute them based on the stiffness of your bearing pad. In this example, a value of 10 is utilized.
Setting the Rx value to 0 requires constructing the diaphragm with girders to maintain torsional stability. Conversely, to overcome stability issues when the girder is constructed without any transverse element, such as diaphragm or deck, a nonzero Rx value is necessary.

Set Transfer Force to Substructure as Yes for all bearing locations.
If you select "Yes," it will create a two-node spring between the pier cap and girder. If you select "No," it will create a one-node spring at the bottom of the girder.

If you do not model the substructure, such as abutment locations, it is necessary to select "Transfer Substructure" as "No." On the other hand, selecting "Yes" is important when substructures are modeled at bearing locations.