design proposal of cycling bridge in lisbon by impromptu arquitectos
image courtesy impromptu arquitectos

portugese firm impromptu arquitectos together with international firm selahattin tuysuz
architects have sent us in images of their proposal for a cycling bridge in lisbon.

the design intends to be an iconic landmark flying delicately over the busy road of
'2ª circular'. based in the shape of number 'eight', with an unsymmetrical arrangement,
it combines in a single and continuous object the three main components of the bridge:
the deck, the two access ramps and a suspension arch. the bridge geometry generates
a dynamic visual experience, since it offers a rich diversity of forms varying according
from where it is approach, both for the pedestrians and cyclists as well as the drivers
passing under.

the bridge is structurally based on a deck supported by an arch. besides the forces
from the structural behavior in the vertical plan, the geometry of the bridge induces
torsions and biaxial bending in the section. due to the type of efforts (biaxial bending
with torsion) it is foreseen in the arch a steel box section and in the deck a similar box
section with the top flange constituted by a composite floor-slab providing the basis for
the pavement.





image courtesy impromptu arquitectos

image courtesy impromptu arquitectos


image courtesy impromptu arquitectos

the selection of bridge materials is based on durability and low maintenance. the structure
is made out of steel and over the bridge deck it is used a layer of slurry pavement, that
should be identical to the cycle paths, in order to emphasize the continuity of the paths
through the bridge. the parapets are made of thin stainless steel extruded profiles, spaced
with 170mm and capped by a stainless steel top rail.

the design comprises a sustainable lighting system. it is used light sources of low energy
consumption, such as LED's, o produce a diffuse and uniform light on the underside of
the bridge deck and arch, in order to emphasize its geometry, without causing light pollution
or dazzling the road users. for the pedestrian route, the lighting will be punctual and in
accordance with the parapets creating a guideline for its users. the lighting scheme is powered
by a photovoltaic system integrated in the upper surface of the arch, with a south orientation.



image courtesy impromptu arquitectos


image courtesy impromptu arquitectos


image courtesy impromptu arquitectos