Wanderlust World Wanderlust World The three fundamental bridge types differ in structural action, span capacity, cost, and aesthetics:
| Feature | Beam Bridge | Arch Bridge | Suspension Bridge |
|---|---|---|---|
| Structural Principle | Bending: horizontal beam resists loads via compression (top) & tension (bottom) | Compression: curved arch carries loads axially to abutments | Tension: cables in tension support deck via suspenders; towers in compression |
| Typical Span | Short: < 80 m (250 ft) | Medium: 80–500 m (250–1,600 ft) | Long: 500–2,000+ m (1,600–6,500+ ft) |
| Materials | Concrete, steel, timber | Stone, concrete, steel | Steel cables, towers (steel/concrete), deck (steel/concrete) |
| Cost | Lowest per meter for short spans | Moderate; high for long spans | Highest; economies of scale at very long spans |
| Maintenance | Simple; inspect bearings, deck | Monitor abutments, spandrels, foundations | Complex: cable inspection, corrosion protection, deck replacement |
| Aesthetics | Utilitarian; can be elegant (haunched girders) | Iconic, monumental; harmonious with landscape | Dramatic, symbolic; defines skylines |
| Site Constraints | Needs piers in water/valley; limited clearance | Needs solid rock abutments; good for deep gorges | Needs anchorages; towers on firm ground; high clearance |
Selection balances span, geology, budget, aesthetics, and maintenance capacity.