Hanger [TB]

A vertical or inclined tension member that suspends the tie girder / deck from an arch rib. Hangers are the primary load path transferring deck and live-load reactions up into the arch; they are typically designed as tension-only members under AASHTO LRFD 6.8 (members in tension) with fatigue checks per 6.6.1.

General

Arch: The arch rib from which the hanger hangs. Pick one previously defined Arch. Required.

Girder: The tie girder (or floor-beam girder) to which the bottom of the hanger attaches. Pick a sub-girder object. Required.

Location Type [Relative (0-1)/Station]: Chooses how Arch Location and Girder Location are interpreted. Relative normalizes to 0 at the arch/girder start and 1 at the end. Station uses absolute X-coordinates.

Arch Location (Relative/Station): Location of the hanger's top on the arch. If Location Type is Relative, 0 is the first bearing of the arch and 1 is the second; values between 0 and 1 interpolate along the arch curve. If Location Type is Station, the value is the X station on the alignment.

Girder Location (Relative/Station): Location of the hanger's bottom on the girder. Same interpretation as Arch Location. The bottom point is placed at the top of the girder; if the girder carries a deck, the connection is lowered by half the deck thickness to sit at the deck mid-depth.

Section: The Section library object used as the hanger cross-section (typically a round bar, rope, or small rolled shape). Picks from Sections. Required. Drives tension-member capacity checks per AASHTO 6.8.

Orientation Angle: Rotation of the section about the hanger's local tangent (beta angle). Useful for orienting non-circular hanger sections.

Offsets

Vertical Offset (Arch): Vertical shift (Z) applied at the arch-end connection, added to the interpolated arch point. Positive is upward.

Horizontal Offset (Arch): Transverse shift (Y) at the arch-end connection. Positive moves to the right when looking up-station (internal -Y application).

Longitudinal Offset (Arch): Longitudinal shift (X) at the arch-end connection. Positive moves up-station.

Vertical Offset (Girder): Vertical shift (Z) applied at the girder-end connection.

Horizontal Offset (Girder): Transverse shift (Y) at the girder-end connection.

Longitudinal Offset (Girder): Longitudinal shift (X) at the girder-end connection.

3D Detailing

Start Face Skew Angle (X-Axis): Rotation of the start-face (arch end) cutting plane about the local X-axis.

End Face Skew Angle (X-Axis): Rotation of the end-face (girder end) cutting plane about the local X-axis.

Start Face Skew Angle (Y-Axis): Rotation of the start-face cutting plane about the local Y-axis.

End Face Skew Angle (Y-Axis): Rotation of the end-face cutting plane about the local Y-axis.

Hanger Opacity: Display opacity in the 3D view, 0 (transparent) to 1 (opaque).

FEA Settings

Number of FE Segments: Number of finite-element subdivisions along the hanger. Typically 1 for a simple tension strut; increase when intermediate nodes are required to attach lateral restraints or to capture cable sag in long hangers.

Merge Intermediate Nodes to Nearest [No/Yes]: When Number of FE Segments is greater than 1, controls whether the intermediate nodes merge with any coincident mesh nodes. Endpoint nodes always merge. Only visible when Number of FE Segments > 1.

Quantities

Min Section Area: Minimum cross-section area along the hanger. (Read-only, may be slow on recompute.)

Max Section Area: Maximum cross-section area along the hanger. (Read-only, may be slow on recompute.)

Total Surface Area: Total exterior surface area including end faces. (Read-only, may be slow on recompute.)

Min Cross Section Perimeter: Smallest section perimeter along the hanger. (Read-only, may be slow on recompute.)

Max Cross Section Perimeter: Largest section perimeter along the hanger. (Read-only, may be slow on recompute.)

Volume: Total volume of the hanger. (Read-only, may be slow on recompute.)

Min Length Path: Shortest path length. (Read-only, may be slow on recompute.)

Length @COG Path: Length along the section's center of gravity — typically equal to the straight-line hanger length. (Read-only, may be slow on recompute.)

Max Length Path: Longest path length. (Read-only, may be slow on recompute.)

Weight: Computed weight, Volume × material density. (Read-only, may be slow on recompute.)

Material: Material name assigned through the section. (Read-only)

Section: Section name assigned to the hanger. (Read-only)

IFC

Type [IfcBridge/IfcBridgePart/IfcBeam/IfcColumn/IfcSlab/IfcFooting/IfcPile/IfcBearing/IfcReinforcingBar/IfcReinforcingMesh/IfcTendon/IfcMechanicalFastener/IfcAlignment/IfcPositioningElement/IfcKerb/IfcGuardrail/IfcSurfaceFeature/IfcElementAssembly/IfcCableSegment/IfcSensor/IfcDistributionElement/IfcPlate/IfcWall/IfcRail/IfcRoad/IfcDiscreteAccessory/IfcDistributionSystem/IfcMember/IfcBuildingElementProxy]: IFC entity class used on export. Default IfcElementAssembly; switch to IfcCableSegment or IfcMember if a more specific class fits your IFC target.

Predefined Type [Abutment/Accessory_Assembly/Arch/Beam_Grid/Braced_Frame/Cross_Bracing/Deck/DilatationPanel/EntranceWorks/Girder/Grid/Mast/Pier/Pylon/Rail_Mechanical_Equipment_Assembly/Reinforcement_Unit/Rigid_Frame/Shelter/SignalAssembly/Slab_Field/SumpBuster/SupportingAssembly/SuspensionAssembly/TrackPanel/Traction_Switching_Assembly/Traffic_Calming_Device/Truss/TurnoutPanel/UserDefined/NotDefined]: Predefined-type attribute of the IFC entity. Default CROSS_BRACING — change to SUSPENSIONASSEMBLY or a user-defined value when more precise classification is needed.

Parent [Bridge/Superstructure/Deck/Substructure/Foundation/Approach_Structure/Retaining_Structure]: Structural-hierarchy parent under which the hanger is nested. Default SUPERSTRUCTURE.

Properties: Custom IFC property entries attached to this hanger on export.