Steel Beam Bridges with Girders
Steel box girder bridges use hollow, rectangular sections for load-bearing. They are classified by cross-section, function, and construction method.
Single-Cell Box Girder: One enclosed chamber; good torsional resistance (e.g., urban viaducts).
Multi-Cell Box Girder: Internal diaphragms improve strength (e.g., cable-stayed bridge decks).
Twin Box Girders: Separate boxes for wide decks or wind stability (e.g., Akashi Kaikyo Bridge).
Simply Supported: Single-span, easy to erect (spans 20–50 m).
Continuous Spans: Multi-span for smoother decks (spans >200 m).
Variable Depth Girders: Optimized for bending moments (e.g., Chongqing Caiyuanba Bridge).
Full-Span Launching: Prefabricated sections lifted into place (for river crossings).
Cantilever Assembly: Segments added symmetrically from piers (e.g., Humen Bridge).
Incremental Launching: Pushed longitudinally into position (e.g., Ganter Bridge).
Swing Erection: Rotated into place over obstacles (e.g., railway crossings).
Flat Steel Box Girders: Low-profile for aerodynamics (e.g., Great Belt Bridge).
Composite Box Girders: Steel box + concrete deck (e.g., Shanghai Lupu Bridge).
Corrugated Steel Web Girders: Reduces weight (e.g., Japan’s Tamagawa Bridge).
Advantages: Lightweight, long-span capability, fast construction.
Challenges: Corrosion protection, buckling risk in thin-walled sections.
Iconic Examples:
Millau Viaduct (France): Multi-cell box girders.
1915 Çanakkale Bridge (Turkey): Suspension bridge with steel box deck.
Steel box girder bridges use hollow, rectangular sections for load-bearing. They are classified by cross-section, function, and construction method.
Single-Cell Box Girder: One enclosed chamber; good torsional resistance (e.g., urban viaducts).
Multi-Cell Box Girder: Internal diaphragms improve strength (e.g., cable-stayed bridge decks).
Twin Box Girders: Separate boxes for wide decks or wind stability (e.g., Akashi Kaikyo Bridge).
Simply Supported: Single-span, easy to erect (spans 20–50 m).
Continuous Spans: Multi-span for smoother decks (spans >200 m).
Variable Depth Girders: Optimized for bending moments (e.g., Chongqing Caiyuanba Bridge).
Full-Span Launching: Prefabricated sections lifted into place (for river crossings).
Cantilever Assembly: Segments added symmetrically from piers (e.g., Humen Bridge).
Incremental Launching: Pushed longitudinally into position (e.g., Ganter Bridge).
Swing Erection: Rotated into place over obstacles (e.g., railway crossings).
Flat Steel Box Girders: Low-profile for aerodynamics (e.g., Great Belt Bridge).
Composite Box Girders: Steel box + concrete deck (e.g., Shanghai Lupu Bridge).
Corrugated Steel Web Girders: Reduces weight (e.g., Japan’s Tamagawa Bridge).
Advantages: Lightweight, long-span capability, fast construction.
Challenges: Corrosion protection, buckling risk in thin-walled sections.
Iconic Examples:
Millau Viaduct (France): Multi-cell box girders.
1915 Çanakkale Bridge (Turkey): Suspension bridge with steel box deck.
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