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Types of Bridges Explained: Suspension, Cable-Stayed, Truss

Tap a bridge type to see its structural principle.

Beam Bridge

The simplest bridge form, a horizontal structure resting on supports at each end. Suited to short spans and inexpensive to build.

Arch Bridge

An arch-shaped structure efficiently distributes the bridge's load out to the piers on either side β€” a sturdy design used widely since ancient Roman times.

Truss Bridge

Built from repeating triangular frameworks that can bear heavy loads with relatively little material, making truss bridges especially common for railway crossings.

Suspension Bridge

Thick cables strung between tall towers, with the bridge deck hung vertically from those cables β€” a design capable of spanning very long distances.

Cable-Stayed Bridge

Similar in appearance to a suspension bridge, but the cables run in a straight line directly from the towers to the deck rather than hanging from a main cable β€” efficient for mid-length spans.

Cantilever Bridge

Built by connecting two structures that each extend outward while anchored at only one end β€” useful where building a mid-span support pier in the river is difficult.

Bridge Structure Is Chosen Based on Terrain and Purpose

Even bridges crossing the same river can end up with completely different structures depending on the river's width, ground conditions, and construction budget. Each structural type distributes load differently, giving each its own strengths and trade-offs.

Which Structure Is Used for the Longest Bridges?

For very long spans, suspension bridges are generally the most suitable, and many of the world's longest bridges are built using the suspension design.

Frequently Asked Questions

What structure is used to build the longest bridges?

Suspension bridges are generally best suited to very long spans, and many of the world's longest bridges are suspension bridges.

How do you tell a suspension bridge apart from a cable-stayed bridge?

A suspension bridge hangs its deck vertically from a thick main cable strung between towers, while a cable-stayed bridge connects its cables in a straight line directly from the tower to the deck.