# Diaphragm \[CUG]

The Diaphragm object serves as a connection element between I-Girders. Both the FEM and 3D models are generated based on the parameter definitions listed below.

## Diaphragm

**Girders**: Specify the girders for which the diaphragms will be generated.

**Station on Girders (from Right End)**: Assume the right-hand side as the starting point for station definition when viewed up-station from the alignment.

**Thickness**: This parameter is used to specify the thickness of the diaphragm in the bridge's transverse direction.

**Material**: Assign a material to the diaphragm. Materials can be selected from previously defined options or imported as needed.

**Top Offset (from Bottom of Top Flange)**: For a visual representation, refer to the figure below.

**Bottom Offset (from Top of Bottom Flange)**: For a visual representation, refer to the figure below.

![image-20240913-125522.png](https://openbrim.atlassian.net/wiki/download/attachments/2575138834/image-20240913-125522.png?api=v2)

## IFC

**Type \[IfcBeam/IfcColumn/IfcSlab/IfcFooting/IfcPile/IfcMember/etc.]:** Specifies the IFC entity type for export. The diaphragm can be exported as various IFC types including 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, or IfcBuildingElementProxy.

**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]:** Specifies the predefined type attribute for the IFC entity. Default value is CROSS\_BRACING.

**Parent \[BRIDGE/SUPERSTRUCTURE/DECK/SUBSTRUCTURE/FOUNDATION/APPROACH\_STRUCTURE/RETAINING\_STRUCTURE]:** Specifies the parent structural hierarchy element in the IFC model. Default value is SUBSTRUCTURE.

## Quantities

**Volume**: The total volume of the diaphragm based on the modeled element definitions.

**Weight**: Based on the material and element definitions, the weight of the diaphragm is calculated.

**Rebar Density(per cubic yard):** Estimated rebar weight per unit concrete volume for the diaphragm, used by downstream quantity takeoff reports to compute total rebar weight from the diaphragm's concrete volume.

**Rebar Weight**: The calculated weight of reinforcement bars in the diaphragm based on the defined rebar density.


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