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1

Navigate to Superstructure > Boundary Conditios > Bearing Fixity

2

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

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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.

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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.

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5

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.

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titleQuick Tip

In this section, nodes are assigned degrees of freedom (DOFs). The coordinate system of each insertion point varies along the support line and alignment. Based on this updated coordinate system, new DOFs need to be allocated.

Tx/Ty/Tz/Rx/Ry/Rz fixities are shown below.

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Bearing Rotation parameter rotates the support clockwise in the XY plane.

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FE behaviour of Transfer Force to Substructure.

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Tip

Completed Bearing Fixity is illustrated below.

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Bearing Fixity

Articulation

Code Block
languagexml
BF1	IP1	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF2	IP2	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF3	IP3	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF4	IP4	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF5	IP5	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF6	IP6	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF7	IP7	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF8	IP8	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF9	IP9	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF10	IP10	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF11	IP11	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF12	IP12	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF13	IP13	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF14	IP14	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF15	IP15	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF16	IP16	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF17	IP17	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF18	IP18	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF19	IP19	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF20	IP20	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF21	IP21	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF22	IP22	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF23	IP23	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF24	IP24	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF25	IP25	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF26	IP26	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF27	IP27	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF28	IP28	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF29	IP29	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF30	IP30	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF31	IP31	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF32	IP32	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF33	IP33	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES
BF34	IP34	1210.8380000	1210.8380000	Fixed	100Free	Free	Free	0.0000	YES