Durchlaufbrücke

A Durchlaufbrücke, often translated as a continuous bridge or multi-span bridge, is a type of bridge structure composed of multiple spans that are rigidly connected to each other. Unlike bridges with distinct piers supporting individual spans, the deck of a Durchlaufbrücke acts as a continuous beam or slab extending over several supports. This continuity creates a more rigid and monolithic structure.

The key characteristic of a Durchlaufbrücke is the absence of expansion joints between consecutive spans, or at least a significantly reduced number compared to simply supported bridges. The deck is designed to resist bending moments and shear forces that are distributed across multiple supports. This continuous nature allows the bridge to behave as a single, unified unit.

The advantages of a Durchlaufbrücke include increased structural rigidity, which can lead to improved load-carrying capacity and reduced deflection. It also offers a smoother riding surface for traffic due to fewer joints. However, the design and construction are more complex, and thermal expansion and contraction can induce significant stresses within the structure, requiring careful consideration of material properties and support design.

Durchlaufbrücken are commonly found in various forms, including beam bridges, slab bridges, and box girder bridges, and are widely used for road and rail crossings where multiple spans are necessary. The continuity of the deck is a defining feature that distinguishes it from a series of simply supported spans.