Ponte della Costituzione

Ponte della Costituzione
Coordinates 45°26′20″N 12°19′10″E / 45.4389°N 12.3194°E / 45.4389; 12.3194Coordinates: 45°26′20″N 12°19′10″E / 45.4389°N 12.3194°E / 45.4389; 12.3194
Crosses Grand Canal
Locale Venice
Maintained by Municipality of Venice
Characteristics
Design arched truss bridge
Material steel with concrete abutments clad in pietra d'Istria and glass
Width varies from 17.68 metres (58.0 ft) to 9.38 metres (30.8 ft)[1]
Longest span 79.72 metres (261.5 ft) (between abutments)[1]
Clearance below 7.04 metres (23.1 ft) (at high tide)[1]
History
Designer Santiago Calatrava
Construction start June 1999 (proposal)[1]
Opened September 11, 2008
Ponte della Costituzione, underside showing structure, 2015

The Ponte della Costituzione (English: Constitution Bridge) is the fourth bridge over the Grand Canal in Venice, Italy. It was designed by Santiago Calatrava, and was moved into place in 2007 (connecting Stazione di Santa Lucia to Piazzale Roma), amid protest by politicians and the general public. The bridge was installed in 2008 and opened to the public on the night of September 11, 2008. The bridge was known as Quarto Ponte sul Canal Grande before the official name was adopted to celebrate the 60th anniversary of the Italian constitution in 2008.[2] Tourists and locals in Venice now refer to it as the Calatrava Bridge (Italian: Ponte di Calatrava).[3]

Planning

In June 1999, the Municipality of Venice drafted a preliminary plan for a fourth bridge over the Grand Canal. Using a public selection process, they commissioned Santiago Calatrava in November 1999 to design the new bridge. Calatrava's response was an arched bridge with a large radius which was designed to be constructed off-site and installed entirely from the canal.[1]

Design

Calatrava designed an arched truss bridge with a radius of 180 metres (590 ft), with a central arch, two side arches and two lower arches. Girders placed perpendicular to the arches join them together. The girders consist of steel tubes and plates, which form closed section boxes. The stairway on the bridge is paved with pietra d'Istria,[1] a stone traditionally used in Venice, alternating with tempered glass steps illuminated from below by fluorescent lights. The parapet is also tempered glass, terminating in a bronze handrail with concealed lighting.[4] The contractor which had the task of constructing of the footbridge was Cignoni. Design and installation studies were carried out by a specialized group: professors Renato Vitaliani (Padua University) and Francesco Colleselli (Brescia University) for geotechnical and foundation aspects, the company Mastropasqua-Zanchin & Associates Structural Engineering for the steel arch and weldings verification, Fagioli Group and Giorgio Romaro (Padua University) for the installation activities.

The internal structure can be appreciated by looking at a cross-section of the bridge exhibited outside at the waterfront, located between the Railway Directorate Headquarters and the Santa Lucia railway station. After fabrication, the bridge was moved into place by a large barge in July 2007.[4]

Controversy

Wheelchair lift constructed after the bridge inauguration

The bridge has received heated criticism and seen inauguration delays and walk-outs, which originated from three main grievances: the lack of wheelchair access, lack of necessity and its modernist-minimalist style being incompatible with Venice's decorative medieval architecture.[2]

Ponte di Calatrava has many steps embedded in its relatively steep pavement, which means elderly people have difficulty climbing it and wheelchair users are excluded from crossing. Due to lasting protests, a mobility lift system resembling cocoons was eventually installed in 2010, incurring large costs, since it was not part of the original design. The official budget for the project was €6.7 million, but actual costs have escalated significantly.[2]

The placement of a new bridge a mere stone-throw from the existing Ponte degli Scalzi bridge has also proven controversial, since the distances between Scalzi and Rialto Bridges or between the Rialto and Ponte dell'Accademia bridges are severalfold longer, and with no other way to cross the canal besides the waterbus (Italian: vaporetto) or traghetto. There is also no permanent connection between Venice and the well-populated Giudecca island, although a tunnel has been proposed at not much greater cost than a bridge, promising better access for tourists and residents.

References

  1. 1 2 3 4 5 6 7 Direct communication with Santiago Calatrava, LLC
  2. 1 2 3 Salmi, Laura (August 28, 2008). "Venice divided: Official opening of Calatrava bridge stalled as tempers rise". World Architecture News.com. Retrieved May 2010. Check date values in: |accessdate= (help)
  3. ↑ "Ponte di Calatrava". europeforvisitors.com. Retrieved May 2010. Check date values in: |accessdate= (help)
  4. 1 2 "Calatrava Bridge Venice". WikiCover. Archived from the original on 2010-01-14. Retrieved May 2010. Check date values in: |accessdate= (help) 6 minute computer graphic video showing bridge installation on barges

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