Article Overview
Trapezoidal bridge sections, often used in truss or steel deck bridges, provide high structural rigidity and can be pre-assembled on the ground before installation.
Structural Design and Geometry
Trapezoidal bridges use trapezoid-shaped sections to form either the main supports or the deck of the bridge. In truss bridges, the trapezoidal shape is often combined with triangular supports to efficiently distribute loads across the structure, making the bridge capable of bearing heavy weights such as trains or vehicles without excessive bending or twisting . The trapezoidal geometry allows for high bending and torsion resistance, which is particularly useful when the bridge is temporarily lying on the ground during assembly or transport .
Steel Trapezoidal Sections
Modern bridges often use steel trapezoidal sections, especially in orthotropic decks. These sections form a closed cross-section with the deck, enhancing stiffness and fatigue resistance. They can be manufactured to precise dimensions using roll forming, allowing lengths up to 21 meters for easy transport and installation . When lying on the ground, these sections are dimensionally stable and can be handled safely, as their torsion is minimal and they can straighten under their own weight .
Applications and Advantages
- Pre-assembly: Trapezoidal sections can be assembled on the ground, reducing on-site construction time and improving safety.
- Load distribution: The trapezoidal shape spreads forces efficiently, reducing stress concentrations.
- Durability: Steel trapezoidal sections are resistant to fatigue and require minimal maintenance .
- Cost-effectiveness: High accuracy in manufacturing reduces welding and labor costs during installation .
Practical Considerations
When a trapezoidal bridge lies on the ground, engineers must ensure proper support to prevent deformation. The closed cross-section design helps maintain structural integrity even before the bridge is lifted into position. Surface treatment and welding are easier due to the precise geometry, which also facilitates long-term durability . In summary, trapezoidal bridge sections lying on the ground are a common practice in modern bridge construction, allowing for efficient pre-assembly, transport, and installation while maintaining high structural performance and cost efficiency.
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