User:Kovposch/Proposed features/More bridge structural details
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More bridge structural details | |
---|---|
Proposal status: | Draft (under way) |
Proposed by: | Kovposch |
Draft started: | 2022-08-24 |
Proposal
Differentiate different sub-types of bridge structures, and highlight more bridge elements.
Rationale
Disclaimer: Not an engineer
Bridge structures
- Overlap between
bridge=cantilever
,bridge:structure=arch
, andbridge:structure=truss
can be difficult to determine in some cases (criteria is the mechanism of support) - Some common attributes exists that can be characterized
- Much distinct looks between variations compared to other types
- Balanced cantilever viaduct has conflict between
bridge=cantilever
andbridge=viaduct
- There are some dubious naming viz Nielsen-Lohse bridge (commonly found, and standard terminology in Japan), which the credited authors didn't actually construct such a bridge even if it might have been patented similarly
Bridge elements
Expansion joint
Expansion joints connect the series of spans to form the whole bridge.
- Assist in outlining
bridge=*
andman_made=bridge
(whether to include ramp or abutment in its extent, or how to defining limit jointless / integral abutment bridge is out-scope) - Helpful to align and trace other objects
- Is a source of noise & vibration; and a point of failure for maintenance, repairs, and disaster management
Parapet
Parapets form the sides of a bridge deck, as well the edge of any raised structure. This can be extended to roof, terrace, balcony, and elevated walkways.
Tagging
Bridge structures
General
bridge:span=*
(There existsbridge:spans=*
to count the number of spans. That's difficult to define and choose from main span, thus out-scope): If different span types exists, currently propose to tag on*way=*
+bridge=*
for the time being, due to uncertainties with a potentialbridge:part=*
viz the abandoned Bridge3D from a decade ago. In particular,bridge:part=ramp
can't seem to handle viaducts, flat raised approach, and intermediate gradients.
bridge:deck=*
: Applies to both arch and girderbridge:deck=through
bridge:deck=half-through
(aka "pony") : (Common in UK)bridge:deck=deck
bridge:hanger=*
bridge:hanger=vertical
bridge:hanger=inclined
(aka Nielsen)bridge:hanger=network
bridge:hanger=cross
(aka Nielsen-Lohse in Japan)bridge:hanger=radial
(aka "spoked wheel")
bridge:girder=*
bridge:girder=box
bridge:girder:box=*
bridge:girder:box=single
bridge:girder:box=spines
: Multi-spine / multi-boxbridge:girder:box=cells
: Multi-cell / cellular
bridge:girder=multi
bridge:girder=ladder
TBD: Truss, bowstring arch
Arch bridge
bridge:structure:arch=*
bridge:structure:arch:form=*
bridge:structure:arch:rib=*
bridge:structure:arch:spandrel=*
bridge:structure:arch:shape=*
bridge:structure:arch:profile=*
TBD: Asymmetric arch
Beam bridges
Bridge elements
Arch
bridge:support=arch
: Useful when the arch isn't vertical. 3D geometry can be derived together withheight=*
, ortilt=*
.
Expansion joints
man_made=expansion_joint
(man_made=*
to allow for use on other features)expansion_joint=*
Parapets
Examples
Rendering
Might be possible to draw up icons for man_made=bridge
in 2D renders to function as a landmark.
3D renders may attempt to generate lookalikes from archetypes.
Features/Pages affected
External discussions
Comments
Please comment on the discussion page.