Filtering

The iTwin repository is very general. It can represent diverse structure types, such as buildings and bridges, and material types like steel, wood, and concrete. RAM Concept filters out any part of the iTwin repository that it does not model or is not relevant. The synchronize operations use the filtered model to determine the context of the changes to be applied.

For example, RAM Concept filters out all steel members. When RAM Concept updates the iTwin repository, it does not need to replicate steel members in the model. The Change Management deduces that RAM Concept is not deleting the steel members because it never read them in.

The RAM Concept filter retains only the following objects from the iTwin repository:

The imported story information
Concrete slabs, footings and beams on the imported story
Concrete walls and columns that are connected to the slabs or beams retained
Static load cases and their loads that are applied to the slabs or beams retained
Concrete materials and curve member sections that are used by the members retained
Concentrated and area surface rebar in slabs
Layer parallel rebar inside and parallel to a beam
Rebar materials used by imported rebar
Straight, rectangular tie, and open U tie perpendicular rebar in slabs or inside and parallel to a beam

RAM Concept ignores the following Analytical iTwin objects:

Non-planar slabs, walls, and surface loads
Sloped slabs
Modifiers and openings in walls
Beams, columns, and curve loads with geometry not equivalent to a single line segment
Beams and columns that do not have the Orientation, Section, and SectionPlacementPoint properties set
Beams with a non-vertical Orientation
Duplicate load cases that correspond to fixed RAM Concept loadings
Hyperstatic load case cause
Rebar in walls or columns
Non-horizontal rebar

RAM Concept and Analytical iTwin use slightly different terminology for structural members and loading types. The following table is a cross-reference of RAM Concept and Analytical iTwin type names.

Table 1. Concept and Analytical iTwin Type Name Cross-Reference
RAM Concept Name	Analytical iTwin Type(/Use)
N/A	Story
Concrete Mix	Concrete
Slab Area	Surface Member/Slab or Surface Member Modifier
Slab Opening	Surface Opening
Beam	Curve Member/Beam
Column	Curve Member/Column
Wall	Surface Member/Wall
Loading	Load Case
Point Load	Point Load
Line Load	Curve Load
Area Load	Surface Load
N/A	Section
Rebar	Rebar Material
Concentrated Rebar	Concentrated Surface Rebar
Distributed Rebar	Area Surface Rebar
Transverse Rebar	Perpendicular Rebar