Roadway [SIG]
- Zeynep Bayam
- Melis Ceylan
- mert.goktas (Unlicensed)
- Cagin Yakar
The roadway definition is used for influence surface-based live load analysis. Based on the roadway definition, an influence surface path is generated and influence coefficients are computed. OpenBrIM Influence surface-based live load analysis automatically places lanes at the transverse locations, so the only important parameter to define is the extent of the roadway.
General
Bridge: Understanding the bridge data is crucial to identify the deck components where the roadway will be placed.
Roadway Dimensions: To define the start and end station of the roadway, users need to define at least two rows. If there is a variation in the roadway width, additional rows can be defined to accurately represent the variation.
Station: Station along the PGL.
Transverse Offset: The transverse offset is measured from the PGL. A value of 0 indicates that the center of the roadway is located at the PGL. Positive values indicate offsetting the center of the roadway to the right, and negative values offset the center of the roadway to the left when looking upstation along the 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).
Right Width [Right Barrier Inner Edge/ Deck Right Edge]: The distance that extends toward the right side when looking up the station along the alignment line. This parameter can either be defined using the options provided or set to a specific value. If the roadway will be generated by taking barriers into account, this parameter can be set to Right Barrier Inner Edge if the barrier should be generated with respect to the deck's edge at that station. The Deck Right Edge option can be used.
Left Width [Left Barrier Inner Edge/ Deck Left Edge]: The distance that extends toward the left side when looking up the station along the alignment line. This parameter can either be defined using the options provided or set to a specific value. If the roadway will be generated by taking barriers into account, this parameter can be set to Left Barrier Inner Edge if the barrier should be generated with respect to the deck's edge at that station. The Deck Left Edge option can be used.
Skew: A skew angle of 0 degrees indicates that the line is perpendicular to the PGL. A positive skew angle rotates the perpendicular line in a clockwise direction, while a negative skew angle rotates it in a counterclockwise direction.
Support Lines Used For Span Length Comp.[All/Selection]: Roadway definitions are essential for Influence Surface-Based analysis, making it critical to ensure the accuracy of the roadway setup. Since support lines may be used for various purposes, not just as span dividers, it’s necessary to eliminate unnecessary ones to define the correct Live Load (LL) path. If support lines are used exclusively for span dividers in a project, the parameter can be defined using the option ‘ALL.’ However, if support lines serve other roles, it is recommended to use the 'Selection' option for more precise control.
Selected Support Lines: If the Support Lines Used for Span Length Comp. parameter is defined with the option ‘Selection,’ then support lines can be chosen using this parameter; otherwise, this parameter will not be applicable (N/A).
Roadway 3D
The following parameters are used solely for 3D visualization purposes and are not used for finite element analysis.
Uniform Lane Width [YES/NO]: If the lanes in the project have the same widths, then this parameter should be set to ‘YES’; otherwise, it should be set to ‘NO.’
Lane Widths (from the right edge of the roadway): If the Uniform Lane Width parameter is set to ‘NO,’ this parameter can be used to define the lane widths sequentially, starting from the right. Otherwise, if uniform lane widths are applied, this parameter will not be applicable.
Lane Width: This parameter is used to define the lane widths when Uniform Lane Wİdth parameter is set to ‘YES’.
Right Shoulder Width: The right shoulder width of the roadway can be specified using this parameter. The definition made for this parameter will not affect the 3D model but will affect the CADD output.
Left Shoulder Width: The left shoulder width of the roadway can be specified using this parameter. Similar to the right shoulder width, the definition made for this parameter will not affect the 3D model but will influence the CADD output.
Lane Divider Spacing: The spacing of lane dividers in the longitudinal direction can be specified using this parameter.
Lane Divider Width: The widths of lane dividers in the transverse direction can be specified using this parameter.
Graphical Thickness: The thickness of the graphical representation of the roadway can be defined here.
Number of Segments (Graphical): This parameter can be specified with a higher value if a more detailed graphics display is needed for the roadway. A higher value is recommended for achieving a smoother edge on roadways with small radius circular bridges.
Show Roadway [YES/NO]: To display the roadway in the 3D model, this parameter should be set to ‘YES.’ If the option ‘NO’ is chosen, the roadway will not be displayed.