A cable-stayed bridge, also known as a diagonal bridge, features a structural system where the main beam is directly supported by multiple cables attached to bridge towers. This system consists of three primary components: the pressurized tower, strained cables, and bent beam body.

• Main Beam: Typically constructed from concrete, steel-concrete combination, or pure steel structure
• Cable Tower: Primarily concrete structures, though steel-concrete combinations or pure steel are also used
• Stay Cable: Manufactured from high-strength materials like steel wire or steel strand

This design significantly reduces beam bending moments and structural weight while increasing span capacity (beam height typically 1/50 to 1/200 of span length).

Features larger main spans, ideal for crossing major rivers.

Smaller main spans suitable for medium rivers and urban channels.

Includes three-tower four-span and other configurations requiring careful structural consideration.

Addresses bending moments near side spans and facilitates safer cantilever construction.

Tower design significantly impacts both aesthetics and structural performance, with various configurations available:

• Single Column: Simple structure for single-plane bridges
• A-Shape: Enhanced stiffness and force distribution
• Inverted Y-Type: Reduces negative bending moments in main beam

Includes single/double column, door/H type, A type, gem/inverted Y type configurations.

Critical factor determining overall bridge stiffness and economy.

• Single Cable Plane: Requires box sections with high torsional stiffness
• Vertical Double Cable Plane: Allows lower torsional stiffness in main beam
• Diagonal Double Cable Plane: Superior wind resistance for spans >600m

Three primary configurations: radial, harp, and sector arrangements.

Cable-stayed bridges can be classified by:

• Tower-Beam-Pier Combination: Floating, semi-floating, consolidation, or rigid systems
• Main Beam Continuity: Continuous or T-structure systems
• Cable Anchoring: Self-anchoring or ground anchoring methods

Hybrid system combining characteristics of beam bridges and cable-stayed bridges.

The main beam serves three critical functions:

1. Distributes loads to cables
2. Provides axial compression resistance
3. Resists transverse wind/seismic forces

• Prestressed Concrete: Economic for spans <400m
• Steel-Concrete Composite: Ideal for 400-600m spans
• All Steel: Recommended for spans >600m
• Hybrid: Steel main span with concrete side spans

Tower columns form the primary structure, with connecting beams classified as load-bearing or non-load-bearing.

Solid bodies for small/medium spans, hollow sections for larger spans, with various cross-section options.

Two primary cable types:

• Parallel Wire Cable with Cold Cast Anchor
• Parallel Steel Cable with Clip Anchor

1. Pneumatic control (surface modifications)
2. Damping vibration reduction devices
3. Dynamic characteristic modification via cable connections

• Support construction
• Push construction
• Rotary construction
• Cantilever construction (assembly or pouring)

• Highway and road crossings
• Railway bridges
• Pedestrian walkways