plate girder: meaning, definition, pronunciation and examples
C1/C2 (Specialized Technical)Formal, Technical (Civil/Structural Engineering, Architecture, Construction)
Quick answer
What does “plate girder” mean?
A structural steel beam composed of separate metal plates riveted, bolted, or welded together to form an I-shaped cross-section, used primarily in bridge and building construction.
Audio
Pronunciation
Definition
Meaning and Definition
A structural steel beam composed of separate metal plates riveted, bolted, or welded together to form an I-shaped cross-section, used primarily in bridge and building construction.
Any built-up girder (as opposed to a rolled girder) made from steel plates, typically with a deep vertical web and horizontal flanges, designed to carry heavy loads over long spans. In broader engineering contexts, it refers to the foundational load-bearing framework.
Dialectal Variation
British vs American Usage
Differences
The term is identical and standard in both dialects within technical contexts. Non-technical references might use simpler terms like 'steel beam' or 'support beam' more frequently in AmE general discourse.
Connotations
Conveys precision, heavy industry, and large-scale infrastructure. In both dialects, it is associated with civil engineering projects like bridges, viaducts, and industrial buildings.
Frequency
Very low frequency in general language; high frequency within specific professional fields of structural engineering and construction.
Grammar
How to Use “plate girder” in a Sentence
The [Material] plate girder supports [Load/Structure].The bridge/roof is constructed from [Number] plate girders.To design/fabricate/erect a plate girder.Vocabulary
Collocations
Examples
Examples of “plate girder” in a Sentence
noun
British English
- The Victorian railway bridge features wrought iron plate girders.
- The design called for a deeper plate girder to accommodate the increased load.
- Corrosion was found in the web of the central plate girder.
American English
- The new overpass will use welded steel plate girders.
- The contractor is responsible for painting all exposed plate girders.
- They reinforced the existing plate girder with additional stiffeners.
Usage
Meaning in Context
Business
Rare, except in procurement or project reports for construction firms ('The contract includes supply of 50-tonne plate girders').
Academic
Common in engineering textbooks, journal articles, and technical papers on structural design, mechanics, and bridge engineering.
Everyday
Extremely rare. A layperson would likely say 'the big steel beam' or 'the bridge's main support'.
Technical
The primary and precise term in structural engineering drawings, specifications, calculations, and on-site construction discussions.
Vocabulary
Synonyms of “plate girder”
Strong
Neutral
Weak
Vocabulary
Antonyms of “plate girder”
Watch out
Common Mistakes When Using “plate girder”
- Mispronouncing 'girder' as /ˈɡaɪr.dər/ (like 'guy').
- Confusing with 'girder' alone, which is a broader category.
- Using 'plate girder' for small, rolled steel sections.
- Misspelling as 'play girder' or 'plain girder'.
FAQ
Frequently Asked Questions
All plate girders are I-shaped, but not all I-beams are plate girders. 'I-beam' often refers to standard rolled sections, while a 'plate girder' is specifically built up from plates, usually for larger, custom applications.
They are most common in bridges (especially railway and road bridges), large industrial buildings, crane runways, and other structures requiring long spans and heavy load capacity.
The vertical 'web' plate and the two horizontal 'flange' plates, connected by 'stiffeners' and joined with rivets, bolts, or welds.
A plate girder is a solid-web beam, while a truss is an open-frame structure composed of many smaller members (like triangles). Girders are used for shorter very heavy loads or where a solid web is needed; trusses are for longer spans with lighter weights.
A structural steel beam composed of separate metal plates riveted, bolted, or welded together to form an I-shaped cross-section, used primarily in bridge and building construction.
Plate girder is usually formal, technical (civil/structural engineering, architecture, construction) in register.
Plate girder: in British English it is pronounced /ˈpleɪt ˌɡɜː.dər/, and in American English it is pronounced /ˈpleɪt ˌɡɜːr.dɚ/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “The backbone of the structure (conceptual, not a fixed idiom)”
- “Built like a plate girder (informal, describing a very strong person or thing)”
Learning
Memory Aids
Mnemonic
Imagine a massive steel 'plate' (flat sheet) that has been bent and joined to 'gird' (encircle/support) a river or railway – a plate girder.
Conceptual Metaphor
THE SKELETON/SPINE OF A STRUCTURE; A SYNTHESIZED/ASSEMBLED STRENGTH.
Practice
Quiz
What is the defining characteristic of a plate girder?