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Longitudinal Offset: The longitudinal offset value specifies the abutment's position relative to the longitudinal (along PGL) direction. A negative value offsets the abutment in the downstation direction, while a positive value offsets it in the upstation direction.
Transverse Offset: The transverse offset value This parameter defines the bridge's location in relation to the abutment. This value should align the abutment's position perpendicular to the Proposed Grade Line (PGL)of the abutment in the transverse direction (perpendicular to PGL). A value of 0 places the abutment at the center of PGL. Negative values offset the abutment to the left (when looking upstation along PGL), while positive values offset it to the right.
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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). |
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Abutment Bottom Elevation: The elevation of the bottom of the abutment can be specified using this parameter. The elevation is calculated with respect to the Proposed Grade Line (PGL), where the PGL's elevation is 0. Negative values of elevation indicate a downward direction.
Abutment Height (readonly): Based on the elevation data, the height of the abutment is calculated and presented to the user in this column.
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