Bridge street

(1)

Outdoor space to the commercial units Public space between units

Space between units working as outdoor space to commercial units Commercial unit, stair down to unit below bridge

Light from hatches in south facade View of stairwell with windcatcher facade

Commercial unit Stair

Light box above stairwell Baywindow framing the view

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Ai 1 Area: 60 m2

Structural weight: 38 ton variations: 1 Units: 3 Infofof rmation

Area: 103 m2 Structural weight: 65 ton variations: 2 Units: 3 Infofof rmation

Area: 146 m2ea: 146 m2 Structural weigheight: 93 ton variations: 1 Units: 1 InInfofof rmation

AArea: 43 m2 StStructural weight: 27 ton vvariations: 1 Uni Units: 1 InInfofof rmation

Area: 129 m2 Structural weight: 82 ton: 82 ton variations: 1 Units: 1 Infofof rmation

Area: 129 m2ea: 129 m2 Structuuctural weight: 82 ton variations: 1tions: 1 Units: 1 Infofof rmmation

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AArea: 146 m2 StStructural weight: 93 ton vvariations: 5 Uni Units: 6 InInfofof rmation

Bonniers Art Gallery

St Eriks Bridge

Greenery Greenery Greenery Greenery

Greenery Greenery Water Water Water Water Water Water Water Sky Sky Sky Sky

Sky

Town Hall

N

Bridge street

The facades to the street on the bridge is closed and used for the wind catch- ers, producing electricity for the street lights. The two sides facing the water will be more opened with windows showing the view of the city.

View The vertical openings between the units creates framed views over the city whilst travelling over the bridge. They also allow for wind to pass through and give natural ventilation into the interior spaces.

Directions

There will always be one side facing south on each compartment. This

to be able to allow for solar panel and cells.

VasterbronSlussen

5,000 10,000 15,000 25,000 30,000 35,000 40,000 45,000 50,000

20,000

NorrbroVasabronStromsbron Stadshusbron KungsbronBarnhusbronKlarabergsviadukten St Eriksbron Bridge

Amount of cars/day

5,000 Bridge

10,000 15,000 35,000 30,000 20,000 25,000

StadshusbronAmount of cars/day Kungsbron Barnhusbron Klarabergsviadukten St Eriksbron

2 Bridge 4 6 14 16 12 8 10

Stadshusbron Kungsbron Barnhusbron Klarabergsviadukten St Eriksbron SkanstullsbronVasterbron

5 10 15 20 25 30

LiljeholmsbronStromsbron Danviksbron Stadshusbron KungsbronBarnhusbronKlarabergsviadukten St Eriksbron

Bridge

Height of bridge in m

N

Bridge street

The facades to the street on the bridge is closed and used for the wind catch- ers, producing electricity for the street lights. The two sides facing the water will be more opened with windows showing the view of the city.

ViewThe vertical openings between the units creates framed views over the city whilst travelling over the bridge. They also allow for wind to pass through and give natural ventilation into the interior spaces.

Directions There will always be one side facing south on each compartment. This to be able to allow for solar panel and cells.

N

Bridge street

The facades to the street on the bridge is closed and used for the wind catch- ers, producing electricity for the street lights. The two sides facing the water will be more opened with windows showing the view of the city.

View The vertical openings between the units creates framed views over the city whilst travelling over the bridge. They also allow for wind to pass through and give natural ventilation into the interior spaces.

Directions

There will always be one side facing south on each compartment. This to be able to allow for solar panel and cells.

Cars

Intention

8m

Future Coaches

Today Bridge function

Cars

Intention

8m

Future Coaches

Today Bridge function

Cars

Intention

8m

Future Coaches

Today Bridge function

Cars

Intention

8m

Future Coaches

Today Bridge function

Structural capacity

25% 25% 25% 25%

100%

25% 25%

100%

St Eriksbron 25m wide

Kungsbron 2x14m wide Barnhusbron 24m wide

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Plan

Wind shafts collects and enhances the wind for natural ventialtion

Wind shafts If the roof isopen the wind moves vertically

Wind shafts

Shafts in three levels Wind shafts

If the roof is closed, will the wind stop, or travel horizontally?

Section bb

in

out out

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in

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in

in in

in out

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Plan

Wind shafts

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out out

N PlanN

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Plan

Wind shafts

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200 mm

100mm

2000 mm

Mirror surface

Copper coil Magnet

Wind turbines rotate around a cen-

tral pivot points in regular openings in the facade

Serial connection for electricity

accumulation Wind turbine components

Provides electricity to street lights

Street light

Light projects into the stairwell, producing a play of light from the rotating panels

Street facade

Rotation from wind generates electricity

200 mm

100mm

2000 mm

Mirror surface

Copper coil Magnet

Wind turbines rotate around a cen-

tral pivot points in regular openings in the facade

Serial connection for electricity

accumulation Wind turbine components

Provides electricity to street lights

Street light

Light projects into the stairwell, producing a play of light from the rotating panels

Street facade

Rotation from wind generates electricity

200 mm

100mm

2000 mm

Mirror surface

Copper coil Magnet

Wind turbines rotate around a cen-

tral pivot points in regular openings in the facade

Serial connection for electricity

accumulation Wind turbine components

Provides electricity to street lights

Street light

Light projects into the stairwell, producing a play of light from the rotating panels

Street facade

Rotation from wind generates electricity

Exposed I want the exposed position of the bridge to inform the architecture. The facades move in the wind, shadows dance in the rooms and rain nurtures the vegetation on the terraces.

Moving facade As the wind moves along the façade, it activates an array of small louvers facing the street, acting as many small wind turbines.

Light While the louvers spin, the light plays along the rear walls of the units.

Ventilation The cuts through the volumes also work as wind pockets, allowing for natural ventilation of each unit.

City hall Barnhusbron Bonniers art gallery

Old town Sergels torg

Central station Sture plan

Unit calculation Timber self-load 500kg/m3 0.368 kg/m2 Snow load 200kg/m2 Working load 200kg/m2 A: For construciton load/m2 500 x net weight x fl oors / area = A B: For working load/ m2 200kg x area = B

C: For total load / m2 A + B + 200 = total load per area Gross volume 10x10x3 = 300 Net volume 9.4x9.4 x2.4 = 212 Net volume = 300-212=88 88x 1 fl oors =88 88/100 = 0.88 x 500 =440 kg/m2 440 + 200 = 640kg/m2 Bridge calculation

1280kg/m2 (including 4 lanes of traffi c) Leave 2 lanes for traffi c, using the other 2 for construction 1280/ 4 lanes = 320 per lane = 640kg/m2 available for construction The bridge m2 = 6920m2 640x6920 = 4454400kg = 4454.4 tonnes available for construction

The life of a Bridge Anne-Charlotte Wiklander Kungliga Tekniska Högskolan School of Architecture Unit: Production of Architecture Tutor: Prof Anders Wilhelmsson Structural engineer tutors: Carlo Diaco Barnhusbron was once built to serve an important purpose for the infrastructure in Stockholm. It was part of the project Radmansleden at the end of the 1960s where city planners intended to connect Kung- sholmen with Lidingobron with a tunnel under the city. Barnhusbron was the only part of this project

that was built and today this bridge is standing large, a manifestation to its unfulfi lled purpose.

I wanted to investigate if this bridge could be used to extend the city out over the water to open up new possibilities and fi nd a new purpose for Barnhusbron.

My introduction to Barnhusbron came through regular bicycle rides between Ostermalm and Kungsholmen, during my second year at architecture school. During the ride, I always crossed this bridge and the one thing that hit me each time was the emptiness of this bridge and the height of its views, almost like entering a lookout tower. Another part that felt very tangible was the exposed feeling to the wind, water

and the sun. These subjective thoughts are something that I want to emphasise in my proposal.

There are two main parts in this project:

- The structural capacity of the bridge - The exposed nature of the bridge These two subjects have been running parallel throughout the project. While my exploration of the structural capacity of the bridge has formed the basis of the typology and the hierarchy of the proposal, the exposed character of the bridge has informed the aesthetics of the architecture.

One important aspect of this project lies within the fact that I have chosen to work with the bridge in its current state, without adding any additional structure. This is central to my argument of giving a new purpose to something that is already built, where existing features become even more accentuated by the intervention.

I believe that the new life of Barnhusbron could help turn this idle part of Stockholm into a welcome addition to both infrastructure and the life of the town. The current, special character of Barnhusbron combined with its new purpose will transform it into an original piece of city of structure.

Manually operated window hatches Rainwater collection

Shop window Sloping roof for rainwater collection

Green roof

Falu black wooden facade Terrace window

Entrance door

Under bridge unit, commericial use

Wind shaft Solar cell railing

Wind catcher interior wall Light play from light

box and wind cathcers Solar cell light box

Baywindow Wind catcher

House nr

Glazing Wood fl oor

Past intention

Current use

Proposed use Unused

The fi rst design exercise is to study other projects where unused spaces have been turned into valuable additions to the city structure.

Parasites In relation to the idea of keeping the bridge as a platform, I would like the new to act as a parasite, exploiting the bridge as its structural base.

Units In order to fi nd out the extra load capacity of the bridge, I’ve experimented with the confi guration of separate units, each with a specifi ed mass.

Purpose Today the bridge’s use is more that of a local link between two city parts separated by water, with many pedestrians and cyclists, far fewer cars than its two neighbouring bridges. Instead, Barnhusbron’s over-dimensioned width and load capacity means that it is now an allocated tourist coach parking lot.

The past: four lane high way traffi c.

Current: 2 lane traffi c and coach parking.

Future: 2 lane traffi c and a continues city structure. Calculation results

Calculations show that there are severe limitations to the mass that can be added to the existing structure.

It also shows that the majority of this load must sit on the surfaces directly above columns, leaving the space between open.

The space in between the clusters of units will be used for recreation areas, as the load needs to be as low as possible.

See-through These cuts in the mass will also off er framed views for people watching the bridge. At some points you will see cars moving behind the building, or clouds slowly passing over the sky

Views Another important parameter of the project is to keep the feeling of being on a bridge, looking out over the city. I have chosen some of the more signifi cant views from the bridge and framed these with the mass of the units.

Scenes Along the route across the bridge, views will present themselves between the units at certain intervals.

M&E fi xings View

Solar cell railing

Signifi cance Each of these small park spaces will fi nd its own character, off ering the opportunity to just take in the view, having your lunch or being used as outdoor spaces for the commercial units.