Cantilever L Abutment [SIG]
- Melis Ceylan
- mert.goktas (Unlicensed)
Abutments on OpenBrIM currently have the Generate FEM (Finite Element Model) option set to 'NO'. However, abutments can still be modeled in 3D and 2D with parametric dependencies to closely represent the actual conditions of the bridge.
General
Location:The location of the abutments can be determined by the chosen support lines.
Orientation [Front/Back]: Orientation can be used for defining the directional placement of abutments, ensuring they align correctly with the overall bridge structure.
Transverse Offset: The transverse offset value can be specified to further define the bridge location. The defined transverse offset value should align with the abutment's position perpendicular to the Proposed Grade Line (PGL).
The positive direction of the Y-axis will be to the left when looking upstream along the PGL. However, based on the requests of engineers who have been using OpenBrIM for their bridge projects, positive transverse offset values will indicate the right-hand side when looking upstream along the PGL. This distinction should be taken into account when defining the location of bridge elements using transverse offset values (where positive transverse offset indicates the right side), as well as when making definitions related to FEM and loading (where positive Fy indicates the left side along the PGL).
Longitudinal Offset: The longitudinal offset value can be specified to offset the abutment with respect to the longitudinal (along PGL) direction. A negative value would mean offsetting the abutment in the downstation direction, while a positive value would mean offsetting the abutment in the upstation direction.
Material: Assign a material to the abutment. Materials can be selected from previously defined options or imported as needed.
Abutment Wall
The properties of the Abutment Wall can be defined using the parameters listed below. For a visual representation of each, refer to the figure below.
Bridge Seat Elevation Offset from Alignment: The vertical offset of the bridge seat elevation from the alignment can be specified using this parameter.
Slope Option [Input/Alignment]: Abutment slope can either be adjusted according to the alignment's slope or defined using the 'Bridge Seat Slope' parameter.
Bridge Seat Slope: This parameter can only be specified if the Slope Option parameter is set to 'Input'. Otherwise, this parameter will be in a 'Not Applicable' (N/A) condition.
Abutment Wall Thickness: The thickness of the abutment wall can be specified using this parameter.
Backwall Thickness: The thickness of the backwall can be specified using this parameter.
Total Width: The total width of the structure can be specified using this parameter.
Wing Walls
The properties of the Wing Walls can be defined using the parameters listed below. For a visual representation of each, refer to the figure below.
Wing Wall Length: The length of the wing wall can be specified using this parameter.
Wing Wall Thickness: The thickness of the wing wall can be specified using this parameter.
Top Elevation Offset from Alignment: The vertical offset of the top elevation from the alignment can be specified using this parameter.
MSE Wall Length [None/Match Edge of the Approach Slab]: The MSE wall for an abutment can be generated to match the defined edge of the approach slab. If such an MSE wall exists in a project, this parameter can be specified.
Footing
The properties of the Footing can be defined using the parameters listed below. For a visual representation of each, refer to the figure below.
Footing Width: The width of the footing can be specified using this parameter.
Footing Depth: The depth of the footing can be specified using this parameter.
Footing Thickness: The thickness of the footing can be specified using this parameter.
Top of Footing Elevation: The elevation at the top surface of the footing can be specified using this parameter.
Approach Slab
The properties of the Approach Slab can be defined using the parameters listed below. For a visual representation of each, refer to the figure below.
Length: The length of the element can be specified using this parameter.
Front Thickness: The thickness at the front face of the element can be specified using this parameter.
Thickness: The overall thickness of the element can be specified using this parameter.
Chamfer Slope H/V: The horizontal/vertical slope of the chamfer can be specified using this parameter.