Steel Truss Bridge vs. Concrete Box Girder Bridge – What’s the Difference? 🌉
Choosing the right bridge structure is not just about aesthetics — it's a decision about strength, lifespan, and long-term value.

Steel Truss Bridge (Truss Bridge)

Structural weight: Light, suitable for small foundations

Span: Can be very long (100–500 m)

Strength: Strong – resists both compression and tension using triangular truss to distribute forces

Material cost: Medium to high (custom-made, almost no repairs needed)
Construction complexity: High – assembled from many parts

Maintenance: Requires rust protection and frequent inspection of rivets or bolts

Concrete Box Girder Bridge
Structural Weight: Heavier than truss bridges but lighter than traditional solid beam bridges, while still offering high strength

Span Length: Medium to long spans (40–200 m)

Strength: Handles compressive, tensile, and torsional forces effectively

Material Cost: Moderate to high (especially when custom-fabricated)

Construction Complexity: Moderate to high – requires special formwork

Maintenance: Minimal, though internal maintenance can be challenging

💡 Quick Summary:
Truss Bridge: Light, suitable for extra-long spans, good for areas with limited foundations — but needs rust care
Box Girder Concrete Bridge: Strong, durable, ideal for large-scale and national infrastructure — with low maintenance