Pedestrian bridge for La Roche-sur-Yon
by Bernard Tschumi and Hugh Dutton

| 27 comments

A pedestrian bridge designed by American New York-based architect Bernard Tschumi and French firm Hugh Dutton Associés has opened in La Roche-sur-Yon in France.

The tubular lattice bridge connects the old centre of Atlantic coast town with newer districts across the TGV railway tracks.

Photos are copyright © Christian Richters/VIEW

Here's some info from the architectural team:


INAUGURATION OF PEDESTRIAN BRIDGE FOR LA ROCHE-SUR-YON, DESIGNED BY BERNARD TSCHUMI AND HUGH DUTTON

LA ROCHE-SUR-YON, FRANCE March 9, 2010: A public ceremony on February 6th inaugurated a footbridge in La Roche-sur-Yon, France, designed by Bernard Tschumi Architects and Hugh Dutton Associates. The bridge's cylindrical structure aims to express the loads and stresses on the bridge while creating an original and contemporary statement for the town, located near resort communities of the western coast.

The extension of the TGV train to La Roche-sur-Yon and nearby towns bordering the Atlantic marks not only an important moment for the modernization of the European and French train network, but also  an occasion to initiate civic improvements.  Linking the historic city founded by Napoleon (“the Pentagon”) with new neighborhoods, this pedestrian bridge crosses above high-speed railway tracks, providing an important urban connection for the town.

Conceived through joint collaboration between the fields of architecture and engineering, the bridge was designed by Bernard Tschumi and Hugh Dutton, with their respective teams in Paris and New York.  The teams developed the design for La Roche-sur-Yon as both a utilitarian vector of movement and a symbol of contemporary urban relationships.  The intention of the designers was to demonstrate an integration of an original structural system with an architectural concept developed from urban scale research of neighborhood identity and carried through the expression of the minutest details.

It has been said that there is no architecture without movement.  A pedestrian bridge is not just a static object, but represents a dynamic vector in both its usage and urban perception.  The designers have sought to express this dynamic characteristic, as much through the structural system as through finishing materials (interlaced polycarbonate surfaces protect passengers from weather conditions, while lighting follows the rhythm of the structure).  Even the bright red-orange color was chosen to emphasize the urban significance of the bridge as a pedestrian vector.

Structure

The new bridge replaces an existing structure, a standard railway design that can be found all over France, contemporary with and inspired by the work of Eiffel, using lateral beams composed of a diagonal mesh of small plate strips that are riveted together.  The design of the new bridge uses the same language of a diagonal mesh, but in a tubular from, to create a complete cylindrical volume through which the users pass. Footbridges over railways require lateral protection for safety of both the users and the trains below. The complete volume provides a single structural solution that possesses the necessary inertia to span between the available support points as well as provide support for the required protective screens and a canopy cover.

Robert le Ricolais, a distinguished thinker and innovator in architectural and engineering design was born in La Roche-sur-Yon, worked in France before World War 2 and then moved to the University of Pennsylvania. He is known for his research work in the development of spatial three dimensional structures, studying structural concepts such as weightlessness and the infinite span.  His work extended beyond architecture and engineering to painting and poetry. The bridge design is an homage to him.

The triangulated mesh of the main structural tube is articulated to distinguish between the tensile and compression forces by using simple tie rods for the tensile members. The ties have no compressive capacity and express therefore the tensile zones. The compressive members are in ‘T’ or ‘H’ sections corresponding to the magnitude of forces in them. The section sizes of the members vary as a function of the loading to optimize the steel mass and further express the forces in the system. Mid-span, the lower chords are tensile, while the upper members are compressed. The inverse is true at the support points, where the bending moments are inverted. The shear forces in tubular truss are generally greater at the support points and tending more and more vertical the closer one approaches the supports. The pattern of triangulation of the truss follows this change in direction of forces. The general objective is to find a harmonious geometric composition that expresses the natural passage of forces.

Team

The complexity of the project required the expertise of in international team. Team leaders included Bernard Tschumi and Hugh Dutton, associated architect Veronique Descharrières within BTuA, and Pierluigi Bucci and Pierre Chassagne, engineers at HDA.  Jean-Marie Garnier of the SNCF managed the project for the client and coordinated implementation.

LA ROCHE-SUR-YON FOOTBRIDGE
La Roche-sur-Yon, France

ARCHITECTS:
Bernard Tschumi and Hugh Dutton

ARCHITECTURAL DESIGN:
Bernard Tschumi Architects (BTA), joint representative, including general design and preliminary urban studies.

ARCHITECTURAL AND STRUCTURAL DESIGN:
Hugh Dutton Associates (HDA)

BTA DESIGN TEAM:
Schematic Design, Design Development:  Francoise Akinosho, Ben Edelberg, Kim Starr.  Construction Documents / Site Supervision : Véronique Descharrières, Vincent Prunier, Rémy Cointet, Alice Dufourmontelle

HDA DESIGN TEAM:
Pierluigi Bucci, Pierre Chassagne, Francesco Cingolani, Maria Angela Corsi, Pietro Demontis, Gaëtan Kolher, Cathy Shortle, Romain Stieltjes, Carla Zaccheddu

CLIENT:
City of La Roche-sur-Yon

PROJECT TEAM:
SNCF  - Engineering Department, Jean-Marie Garnier

CONTRACTOR:
Renaudat Centre Constructions

PHOTOGRAPHY:
© Christian Richters

TECHNICAL DATA:
67 meters (35+32 spans)
201 square meters of concrete deck
160 tons of total weight, of which 130 tons of steel  ie 1,9 tons per linear meter
76 circular diaphragms, 2100 compressive diagonals, 600 tensile rods
4300 meters of profiles, about 10 km of welding, 1800 conical nodes

  • http://www.session23design.com Michael

    I love it when Tschumi finds a way to avoid designing a facade through the intervention of structure.

  • PY

    Good lord… why would any today’s architect build such a horrible bridge ??

    It may be appropriate for cows or any other cattle… but come on we’re HUMANS. It looks like we are dangerous animals. There are many other ways to prevent people from comiting suicide on the tracks !

    And I dont care how complex it is to build, how revolutionnary it may be : it looks like a bad piece of architecture from the 70′s!!

  • http://formles.com formles

    Clearly a Tschumi design. Resemblance with park de la villette is clear.

  • http://www.loncatt.com loncatt

    industralize world. Very strong !

  • http://www.dougosborn.com Doug Osborn

    Slinky toy. I like it inside and outside.

  • http://netzfx.de Oliver

    perfect construction … with a beautiful color … good!

  • Gab Xiao

    looks pretty corny…

  • http://paulgodart.free.fr Paul

    Beaucoup trop massif….
    C’est une passerelle piéton pas un tunnel pour Semi-remorque !

  • http://ulicamickiewicza.blogspot.com/ linesliq

    It`s a funny idea to place such pipe but too industrial, and red is too strong.

  • Freddy_C

    Tschumi is actually Swiss….

  • willem

    you made my day! where bridges and railways meet, there is chance for timeless engineering beauty. gustave eiffel prooved that as isambard kingdom brunel did. bernard tschumi and his team took place in this great tradition. please go on with building these wonderful constructions.

  • http://www.gebaracad.com JP

    trains and this bridge!!!! the perfect dialogue.

  • Kaji

    Are you sure Tschumi is american?

  • http://www.thefold.co.za chris

    nice to see architect sketches.

  • Luca Biselli

    Please have also a look at Calatrava’s design:

    http://www.worldarchitecturenews.com/index.php?fuseaction=wanappln.projectview&upload_id=12132

    which is really elegant.
    Regards

  • Maro

    such pipe should be burried under ground

  • http://hdaparis.com Francesco

    Hi,
    Thanks for this post and comments.
    you can find the high res sketchs and more creative commons images on HDA flickr page

    http://www.flickr.com/photos/hdaparis/sets/72157622365730792/

  • Jones

    It’s like an overengineered return to the bad old days of 1980s municipal viaducts.

  • mayan temple

    @PY

    you are the type that says everything sucks but yet never does anything about it. This bridge is quite good. i would imagine that in person it would only then reveal its magic

  • mcmlxix

    As a piece of engineering, it’s nice. As a piece of urban design it’s horrid…a forbidding tube that must be consciously navigated to pipe people over a divisive no-man’s land…instead of a let’s say a psychologically integrated ramped, open overpass park.

  • http://www.session23design.com Michael

    Francesco! Thanks!

    The entire structure is rather ingenious. It looks to be the world’s first “Tube Truss”.

    And I completely agree with JP. When matched with trains, that are becoming more and more tube like themselves, you will have great dialogue.

  • James

    In a bookstore near you….

    “How to make a basic elevated sidewalk so excessively complex and convoluted that it requires an international team of experts to design.”

    By Bernard Tschumi

    Foreward in four volumes by Jacques Derrida

    Update: Now includes the phrase “dynamic vector” and “urban perception.”

  • mflo

    Jacques Derrida is dead
    Maybe by Manuel de Landa instead

  • Jetwax

    Very impressive! Did think that the supports of the bridge could also have been painted red as well to bring the supports into harmony, otherwise a feature that the town will be proud of for some time d;-)

  • http://www.boardello.co.uk/ board™

    This looks like a great example of over-design, over-engineering without any though to the future… This i going to be hugely depressing when the red paint starts fading and peeling off …

    Just think what you could have done with this seemingly massive budget!

    Paint it black and wrap in ivy please! =]

    Ginger x

  • xtiaan

    stunning and apt!

  • Marton

    This is not a Pipe