Concrete Deck w/ Panels [PIG]
This object models a composite bridge deck composed of stay-in-place precast concrete deck panels (PCDPs) spanning between adjacent precast-I-girders, with a cast-in-place (CIP) topping poured on top. The panels rest on mortar bedding strips placed along the top flange of each girder. The combined panel + topping acts as the structural deck for the composite section.
The object is identical to the standard Concrete Deck except for an additional Panel group that defines the panel and bedding geometry, plus two extra read-only outputs in Quantities that report panel and bedding volumes separately from the topping.
General
All parameters in this section behave identically to the standard Concrete Deck. The longitudinal extent of the deck is defined by the support lines selected here; the transverse profile is defined by the cross-section assigned in the Properties → Sections stage. Refer to the standard Concrete Deck page for full descriptions of:
Cross-Sections (Cross Section Location, Offset From Support Line, Cross Section, Variation w/Next Segment)
Girders — must be
@OBPGirderPrecastIinstances; panels span between adjacent girders in the listTaper [NO/YES] and Overhang Bottom Flat [NO/YES]
Material — concrete material assigned to both the CIP topping and (currently) the panels
Deck Reinforcement Data — station-dependent rebar layout
Panel
This group defines the precast deck panel and bedding strip geometry. All four parameters apply uniformly across every panel placed between any two adjacent girders.
Panel Thickness: Thickness of the precast panel itself (the depth measured from the top of the bedding strip to the underside of the CIP topping). Typical values are 3.5 in to 4 in. The CIP topping thickness is computed as the total deck thickness from the cross-section minus this panel thickness.
Panel Width Inside Haunch: Horizontal distance the panel extends inward from the edge of the haunch (i.e. how far the panel laps onto the girder top flange beyond the bedding strip). Controls the bearing-length of the panel on each girder.
Panel Chamfer: Chamfer dimension applied to the bottom corners of the panel where it meets the bedding strip / girder. A value of 0 produces a square panel edge; non-zero values produce a 45° chamfer of that depth — used to ease detailing and reduce stress concentrations at the panel-bedding interface.
Bedding Strip Width: Width of the mortar bedding strip placed along each girder's top flange where the panel bears. Typical values are 1 in to 2 in. Bedding strips run continuously along the girder length.
FEA
The FEA behavior of the composite deck is the same as the standard Concrete Deck. Panels and topping are not separately meshed — they are treated as a single composite shell using the assigned Material and total cross-section thickness. All Expansion Joint End Releases, Deck Property Overrides, Longitudinal/Transverse Boundary, Continuous at Start/End, Additional Mesh Lines, and Mesh Algorithm parameters behave as documented for the standard deck.
3D Settings
The 3D-only parameters (Curve Refinement, Initial / End Cantilever Length of Deck, Drip Notch, Right/Left Top/Bot Chamfer, Additional Deck Thickness, Barrier Region Width) behave identically to the standard Concrete Deck. The 3D rendering shows three distinct surfaces: the CIP topping (light gray), the precast panels (medium gray), and the bedding strips (dark gray).
Quantities
All quantity columns from the standard Concrete Deck (cross-section areas, perimeters, lengths, top surface area, widths, volume, weight, rebar quantities, material) are reported. Two additional read-only outputs are exposed:
Volume - Panels: Total volume of all precast panels in the deck, summed across every span and every panel-bay between adjacent girders. Excludes the CIP topping and bedding strips. (Read-only; expensive computation.)
Volume - Bedding Strips: Total volume of all mortar bedding strips along every girder, summed across every span. Excludes panels and topping. (Read-only; expensive computation.)
The standard Volume column reports the CIP topping volume only — to get the total deck concrete take-off, sum Volume, Volume - Panels, and Volume - Bedding Strips.
Referencing Objects
Same as the standard Concrete Deck: Construction States, Barriers, Rails, Bicycle Railings, Cables, and Transverse Beams Under Deck that reference this deck (all read-only). A deck with panels does not support transverse beams under deck.
Parameter Reference
Full list of parameters inherited from the standard Concrete Deck behavior.
Expansion Joint End Releases: See Concrete Deck — FEA.
Deck Property Overrides: See Concrete Deck — FEA.
Continuous at Start [NO/YES]: See Concrete Deck — FEA.
Continuous at End [NO/YES]: See Concrete Deck — FEA.
Cross-Frame Mesh Inclusion[Force Cross-Frame Points into Mesh=1/Adapt Cross-Frames to Mesh=2]: See Concrete Deck — FEA.
Additional Mesh Lines: See Concrete Deck — FEA.
Mesh Algorithm [GridMesh/MeshAdapt/Automatic/Initial mesh only/Delaunay/Frontal-Delaunay/Frontal-Delaunay for Quads/Packing of Parallelograms/Quasi-structured Quad]: See Concrete Deck — FEA.
Curve Refinement: See Concrete Deck — 3D Settings.
Initial Cantilever Length of Deck: See Concrete Deck — 3D Settings.
End Cantilever Length of Deck: See Concrete Deck — 3D Settings.
Drip Notch [NO/YES]: See Concrete Deck — 3D Settings.
Right Top Chamfer: See Concrete Deck — 3D Settings.
Right Bot Chamfer: See Concrete Deck — 3D Settings.
Left Top Chamfer: See Concrete Deck — 3D Settings.
Left Bot Chamfer: See Concrete Deck — 3D Settings.
Additional Deck Thickness: See Concrete Deck — 3D Settings.
Barrier Region Width: See Concrete Deck — 3D Settings.
Min Cross Section Area: Read-only quantity. See Concrete Deck — Quantities.
Max Cross Section Area: Read-only quantity.
Min Perimeter: Read-only quantity.
Max Perimeter: Read-only quantity.
Length Min Path: Read-only quantity.
Length @COG: Read-only quantity.
Length Max Path: Read-only quantity.
Top Surface Area: Read-only quantity.
Min Width: Read-only quantity.
Max Width: Read-only quantity.
Rebar Calculation Method [By Density/By Length]: Selects whether deck rebar weight is computed from a per-volume density or from individual rebar lengths.
Rebar Density(per cubic yard): Rebar weight per unit deck volume, used when Rebar Calculation Method is By Density.
Rebar Weight (By Density): Read-only; rebar weight computed by multiplying deck volume by Rebar Density.
Longitudinal Reinforcement Length (Bot Layer): Total length of longitudinal reinforcement in the bottom layer, used when Rebar Calculation Method is By Length.
Longitudinal Reinforcement Length (Top Layer): Total length of longitudinal reinforcement in the top layer.
Longitudinal Reinforcement Weight (Bot Layer): Read-only; bottom-layer longitudinal reinforcement weight.
Longitudinal Reinforcement Weight (Top Layer): Read-only; top-layer longitudinal reinforcement weight.
Total Rebar Weight (By Length): Read-only; total rebar weight computed by summing longitudinal and transverse lengths.
Material (Read-Only): Read-only concrete material used for the deck (set by the Material input in the General section).
Construction States: Read-only back-reference list of Construction State objects that reference this deck.
Barriers: Read-only back-reference list of Barrier objects that reference this deck.
Rails: Read-only back-reference list of Rail objects that reference this deck.
Bicycle Railings: Read-only back-reference list of Bicycle Railing objects that reference this deck.
Cables: Read-only back-reference list of stay-cable objects that reference this deck.
Transverse Beams Under Deck: Read-only back-reference list of Transverse Beam Under Deck objects that reference this deck. A deck with panels does not support them, so the list stays empty.
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