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Main Girder
bridge.superstructure.main_load_system.girderpublishedEdit
Definition
Primary longitudinal beam carrying deck loads to supports.
- Class kind
- component
- Abstract
- no
- Depth
- 3
- Origin
- reference source
- Ontology
- engineering-reference-book.bridge v1.0.0
- Aliases
- Longitudinal Girder, Main Beam
- Abbreviations
- —
- Last changed
- 7/27/2026, 2:50:05 PM
Identification
- Positive labels
- Main Girder, Longitudinal Girder, Main Beam
- Negative labels
- —
- Visual features
- longitudinal spanning member
- Min identity clues
- 2
Evidence
- Preferred views
- plan, elevation, cross_section, schedule
- Evidence types
- view, detail, schedule, note, dimension, level, section_callout
- Source trace required
- yes
Measurements (5)
| Name | Symbol | Unit | Required |
|---|---|---|---|
| Span Length | L_span | m/mm | required |
| Cross-sectional Area | A | m2/mm2 | required |
| Instance Count | N | count | required |
| Material Type | MAT | — | required |
| Mass | M | kg/t | optional |
Relationships (2)
- supported_by
bridge.superstructure.bearing_system - supports
bridge.superstructure.deck_system
BOQ items (1)
| Item code | Formula | Result | Unit |
|---|---|---|---|
bridge.girder.volume | A * L_span * N | volume | m3 |
Validation
- Blocking if missing
- yes
- Human review allowed
- yes
no_evidence_no_numberretain_document_page_bbox_and_evidence_iddo_not_mix_drawing_revisionsdo_not_average_conflicting_valuesprefer_explicit_labels_over_shape_onlymatch_plan_elevation_and_section_when_applicable
Provenance
- Basis
- engineering_reference
- Project values included
- no