Content Comparison

The definitions made in this section affect the 3D model and, accordingly, the 2D model. The finite element model will be visible when fixity values are defined. The definitions related with 3D model of the object can be specified by using the tabs ‘Masonry’, ‘Pot and Piston’, ‘Sole Plate’.

Articulation

Insertion Point: Used for specifying the bearing location and can be selected by using the three dots and the options ‘Pick...’ and ‘Select...’.

Tx[Fixed/Free/Stiffness]:When the bearing rotation is 0 degrees, Tx represents the stiffness in the longitudinal direction. It is typical for a continuous girder to have at least one fixed bearing (or to use a real stiffness value) in the Tx direction.

Ty[Fixed/Free/Stiffness]: Ty represents the stiffness in the transverse direction when the bearing rotation is 0 degrees.

Tz[Fixed/Free/Stiffness]: Tz represents the stiffness in the vertical direction. It is common to use a high stiffness value, such as 1000 kip/in, or to fix the bearing.

Rx[Fixed/Free/Stiffness]: To address stability concerns, a small Rx stiffness can be used in the torsional direction (Rx) under certain conditions. If the constructed girders are not connected with bracings to other girders at any stage, it can result in stability issues. Therefore, a small Rx stiffness is recommended to overcome this problem.

Ry[Fixed/Free/Stiffness]: Typically, bearings are free to rotate in the Ry direction.

Rz[Fixed/Free/Stiffness]: Typically, bearings are free to rotate in the Rz direction.

Bearing Rotation: Curved decks can be guided either radially from a fixed point or tangentially to the radius of curvature. When the deck is guided radially, precise geometry is crucial for the bearings that are farthest from the fixed point. For structures with a constant curvature, it is recommended to align the bearings tangentially to effectively guide the deck around the curve as it expands and contracts.

Transfer Forces to Substructure [Yes/No]: If the user chooses to connect the superstructure to the substructure, a two-node spring is required between the pier cap and the girder, which can be generated by selecting “YES”. Conversely, if there is no substructure or if the abutments are being considered ( currently, abutments in OpenBrIM have the "Generate FEM" option set to “NO”), the correct setting for the "Transfer Forces to Substructure" parameter is“NO” and one node springs are needed.

Masonry

3D related definitions can be made by using related tabs of the object. Masonry Tab includes parameters below:

Width of the Masonry Plate:

Length of the Masonry Plate:

Thickness of the Masonry Plate:

Edge Distance of Bolt Holes (Long. Dir.):

Edge Distance of Bolt Holes (Trans. Dir.):

Diameter of Bolt Holes:

Show Bolt Hole (Detailing) [YES/NO]:

Number of Segments Used to Draw the Bolt Hole:

Pot and Piston

Pot and Piston tab includes parameters below:

Piston Diameter:

Pot Wall Thickness:

Piston Thickness:

Elastomer Disc Depth:

Bearing Depth of Piston Compression:

SolePlate

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Sole Plate

Sole Plate tab includes parameters below:

Sole plate lengthPlate Length:

Sole Plate Width:

Sole plate widthPlate Thickness:Image Removed

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