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There is a need for a reinforcing bar group #164
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Model sample containing five bar groups ISO-10303-21; DATA; END-ISO-10303-21; |
Please consult the README of the Implementers Forum GitHub page to better understand the role and purpose of this group. This is not the venue, nor the process to propose new entities or modifications to the existing IFC schema. I would suggest starting a discussion in the buildingSMART forums, to see if other users have similar needs or may already have a solution for the suggested use-case. Finally, please never post IFC file content as text in GitHub. The # character creates links to existing GItHub issues in this repository. |
The proposal
There is a need for a reinforcing bar group.
Suggested names: IfcReinforcingBargroup or IfcReinforcingBarDistribution.
Bar group as an entity
Rebar grouping is a well-known technique in reinforcement detailing software applications, and represents a group of bars with the following attributes:
6.1 The spacing between neighbouring bars is constant
6.2 There is a continuously linear relationship of all the starting points of the bars: All the starting points lie on a line defined by a straight-line equation
6.3 Statement 6.2 (above) applies to the end points of the bars.
Distribution geometry on plane: The implication of the statements under this section (5) for 2D plane is that the boundary shape of a bar group can only be trapezoidal (or rectangular).
On the construction site, a bar group represents a single continuous distribution of bars. In certain places, some reinforcement installers actually charge based on the number of the bar groups.
The problem with IfcReinforcingBar
The present IfcReinforcingBar, according to the definition, does not fit into the above conditions. Some software vendors (Nemetschek’s Allplan for instance) try to adapt IfcReinforcingBar to represent bar grouping, but these bars lose their identity and attributes once you opened them outside the origin software. The single most-important attribute missing is the bar spacing.
The reason bar group is needed
The advantage of bar grouping is easy creation and management of bars.
There is a need for a reinforcing bar group.pdf
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