{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.span","code":"thing-q1960395","url":"https://ver.cy/models/thing/q1960395/","name":"span","alternateNames":["eastbound span","westbound span","northbound span","southbound span","bridge span","main span"],"kind":"thing","status":"research-draft","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"thing","plane":"XCT","domain":["XCT.QTY"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The distance between two supports of a structure such as a bridge, beam or arch, or the structural section between them; also the full length of a bridge carriageway in one direction.","purpose":"Let an agent handle spans by structure, length, type, design and inspection, and separate other senses such as time span and wingspan.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Distance between supports","Drives structural choice","Measured in several ways","Key for loads and deflection"],"structure":{"bundles":[{"id":"measure","name":"Measure","description":"Length.","layers":[{"id":"length","name":"Length","description":"Value.","findings":[{"id":"length-finding","name":"Length","description":"Span length.","questions":[{"text":"What is the span length and how is it measured?","kind":"measurement"},{"text":"Is it clear span or centre-to-centre?","kind":"definition"}]}]},{"id":"context","name":"Context","description":"Which structure.","findings":[{"id":"context-finding","name":"Context","description":"Structure.","questions":[{"text":"Which bridge, beam or roof is meant?","kind":"provenance"},{"text":"Is it the main span?","kind":"definition"}]}]}]},{"id":"design","name":"Design","description":"Structural choice.","layers":[{"id":"type","name":"Type","description":"Structural system.","findings":[{"id":"type-finding","name":"Type","description":"Structural system.","questions":[{"text":"Which structural system suits this span?","kind":"definition"},{"text":"Why?","kind":"definition"}]}]},{"id":"tables","name":"Tables","description":"Span tables.","findings":[{"id":"tables-finding","name":"Tables","description":"Span tables.","questions":[{"text":"What span does the table allow for this beam and load?","kind":"provenance"},{"text":"Should an engineer check the design?","kind":"action"}]}]}]},{"id":"safety","name":"Safety","description":"Loads and inspection.","layers":[{"id":"loads","name":"Loads","description":"Limits.","findings":[{"id":"loads-finding","name":"Loads","description":"Load limits.","questions":[{"text":"What load limits apply to the span?","kind":"provenance"},{"text":"Are weight restrictions posted?","kind":"provenance"}]}]},{"id":"inspection","name":"Inspection","description":"Condition.","findings":[{"id":"inspection-finding","name":"Inspection","description":"Inspection.","questions":[{"text":"When was the span last inspected?","kind":"provenance"},{"text":"What condition was recorded?","kind":"provenance"}]}]}]},{"id":"senses","name":"Senses","description":"Disambiguation.","layers":[{"id":"time","name":"Time","description":"Time span.","findings":[{"id":"time-finding","name":"Time","description":"Time sense.","questions":[{"text":"Is a period of time meant?","kind":"boundary"},{"text":"Which entry fits?","kind":"action"}]}]},{"id":"other","name":"Other","description":"Wingspan, hand span.","findings":[{"id":"other-finding","name":"Other","description":"Other senses.","questions":[{"text":"Is a wingspan or hand span meant?","kind":"boundary"},{"text":"Which entry fits?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Report the span of a bridge or beam from design records or measurement.","Flag deflection, cracking or damage in a span to the structure's owner."],"mustNot":["Approve loads on a span beyond its rated capacity.","Hide or downplay defects found in a span that people cross or work under.","Alter supports or remove members of a span without engineering approval."],"requiresHuman":["Closing or reopening a bridge span to traffic.","Accepting a span as safe after damage or repair."]},"ethics":{"considerations":["People cross and live under spans; a failure kills without warning.","Closing a span cuts off communities and emergency access."],"affectedParties":["People crossing or under the structure","Communities that depend on the crossing","Workers on inspection and repair"]},"owners":{"steward":"The owner of the structure, such as a highway or rail authority; a qualified engineer answers for its design.","roles":[],"masterSystems":["Bridge and structure asset registers"]},"relations":[{"target":"Q36253","type":"parent","note":"registry parent class"},{"target":"Q811679","type":"parent","note":"registry parent class"},{"target":"length and structural element","type":"related","note":"category"},{"target":"bridge","type":"related","note":"structure"},{"target":"pier and abutment","type":"related","note":"supports"},{"target":"time span","type":"related","note":"another sense"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.span","Wikidata: Q1960395 (https://www.wikidata.org/wiki/Q1960395)"]},"properties":{"applicability":"not-applicable","items":["longest suspension bridge main spans: about 2000 m - order of magnitude, record holders"]},"recognition":{"applicability":"optional","items":["Main span and side spans","Clear span versus centre-to-centre","Wingspan and time span are other senses","The open length of a bridge or beam between piers, abutments or columns."]},"capabilities":{"applicability":"required","items":["compare bridge spans","relate span to structural type","check span tables for beams","find inspection and load information"]},"hazards":{"applicability":"required","items":["Excessive deflection","Overloading","Using span tables beyond their scope"]},"interfaces":{"applicability":"required","items":["Eurocodes for bridge and beam design","Timber and steel span tables","Bridge inspection standards"]},"context":{"applicability":"required","items":["Describing and designing structures between supports.","main spans","side and approach spans","clear spans","continuous and simple spans"]}},"sources":[],"openQuestions":["Should span types be separate entries?","How should bridge records be linked?","How should other senses be split off?"],"resources":{"spec":"/models/things/publications/thing-q1960395/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1960395/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T10:00:33Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"missing"},"notes":{"interaction.properties":"Plane XCT: no invented physical properties.","sources":"Written from model knowledge without web access; claims are unverified."},"score":0.938}}