The cyclist and pedestrian bridge over the river Santerno is fundamental to the widening of the historic bridge dating from 1945 that carries the 610 Provincial Road linking the provinces of Ferrara, Bologna and Florence. The physical limitations of the old bridge meant that it was obviously unable, in static and functional terms, to ensure the safety of cyclists and pedestrians. A second bridge was therefore erected alongside the older structure, designed not only to respect its appearance but to enhance its main architectural, environmental and panoramic features. The work was completed in the form of a steel structure consisting of a series of arches, secured to the existing bridge walls and supporting a wooden platform acting as pedestrian walkway and cycle track. The arches are set at an angle to transfer vertical load to the piles of the old bridge, and the beams supporting the platform are secured to the walls of the old bridge to complete the structure and prevent tipping movement. Similar reasoning underlies the bridge over the Venice-Milan motorway in the municipality of Colognola ai Colli near Verona. The objective of this project was to render the old San Pietro bridge accessible to all categories of user by erecting a second bridge with a modern, lightweight reticular structure along the west face of the existing bridge. This design solution avoids mixing different types of traffic and maintains protected areas for the different categories of user. The new bridge has a total width of 2.50 metres and runs alongside the older structure while remaining independent of it. The project has therefore chosen a solution that makes use of the original bridge without compromising its structural strength. From a formal point of view the pedestrian bridge blends with the old bridge in a very elegant manner by deriving trellises with natural shapes from the central pile. The structure of the new bridge is characterised by a spatial reticular beam supported by branching trellis structures. Extending primarily in a longitudinal direction, the new structure is composed of a sequence of triangles arranged in all three spatial axes, covering a width of 2.50 metres at walkway height and a total length of 57.8 metres.
Re-estabilishing the Functionality of Older Bridges: Two Case Studies, Italy
SIVIERO, ENZO;
2008-01-01
Abstract
The cyclist and pedestrian bridge over the river Santerno is fundamental to the widening of the historic bridge dating from 1945 that carries the 610 Provincial Road linking the provinces of Ferrara, Bologna and Florence. The physical limitations of the old bridge meant that it was obviously unable, in static and functional terms, to ensure the safety of cyclists and pedestrians. A second bridge was therefore erected alongside the older structure, designed not only to respect its appearance but to enhance its main architectural, environmental and panoramic features. The work was completed in the form of a steel structure consisting of a series of arches, secured to the existing bridge walls and supporting a wooden platform acting as pedestrian walkway and cycle track. The arches are set at an angle to transfer vertical load to the piles of the old bridge, and the beams supporting the platform are secured to the walls of the old bridge to complete the structure and prevent tipping movement. Similar reasoning underlies the bridge over the Venice-Milan motorway in the municipality of Colognola ai Colli near Verona. The objective of this project was to render the old San Pietro bridge accessible to all categories of user by erecting a second bridge with a modern, lightweight reticular structure along the west face of the existing bridge. This design solution avoids mixing different types of traffic and maintains protected areas for the different categories of user. The new bridge has a total width of 2.50 metres and runs alongside the older structure while remaining independent of it. The project has therefore chosen a solution that makes use of the original bridge without compromising its structural strength. From a formal point of view the pedestrian bridge blends with the old bridge in a very elegant manner by deriving trellises with natural shapes from the central pile. The structure of the new bridge is characterised by a spatial reticular beam supported by branching trellis structures. Extending primarily in a longitudinal direction, the new structure is composed of a sequence of triangles arranged in all three spatial axes, covering a width of 2.50 metres at walkway height and a total length of 57.8 metres.
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