A stressed-ribbon bridge is characterized by its slender and lightweight design. It is a variant of a suspension bridge, but with some unique features that set it apart from traditional suspension bridges.
In a stressed-ribbon bridge, the load-bearing element is a continuous concrete ribbon or slab that is tensioned between abutments or support towers. The ribbon is typically made of precast concrete segments or cast-in-place concrete. The load is distributed along the entire length of the ribbon, which helps in minimizing the stresses and deflections.
One of the distinguishing features of a stressed ribbon bridge is the absence of vertical suspender cables or hangers that are commonly seen in suspension bridges. Instead, the ribbon itself acts as the primary load-bearing and stabilizing element. The ribbon is usually curved in shape, resembling a shallow arch, which helps in resisting the horizontal forces caused by the bridge’s own weight and the traffic loads.
The structural behavior of a stressed-ribbon bridge is a combined of arch action and suspension action. The curvature of the ribbon provides the arch-like resistance to bending forces, while the tension in the ribbon resists the vertical loads and helps maintain the overall stability of the bridge.
Stressed-ribbon bridges are often favored for their aesthetic appeal and they can span long distances with minimal use of materials. They are lightweight, flexible, and constructed relatively quickly. Additionally, their streamlined design reduces wind resistance, making them suitable for locations prone to high winds.
These categories of bridges have been used in various applications, including pedestrian bridges, cycle bridges, and even in some cases for vehicle traffic. They have gained popularity in recent years due to their unique design and cost-effective construction with respect to other bridge types.
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