bergen in a wood construction fever - the first 14 storey ... … · bergen in a wood construction...
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Bergen in a wood construction fever -the first 14 storey buildingthe first 14 storey building
Vancouver. 2014-01-23
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Mr. Sc. Rune B Abrahamsen, Sweco, Lillehammer, Norway
2014 International Wood Symposium. Vancouver
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Sweco
Sweco is one of Europe’s leading companies in consulting engineering, environmental technology and architecture
9 000 employees in 12 countries
1 billion € net sales
37 000 assignments per year
15 000 t15 000 customers
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Timber high-rise
- Sweco Norway has previously done feasibility studies on tall timber buildings
- Barentshus in Kirkenes, Norway. 20 storey office building
- Rundeskogen in Stavanger, Norway. 15 storey t t b ildiapartment building.
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2007. Rundeskogen, Sandnes15 storey timber apartment building with15 storey timber apartment building with
concrete core
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2010. Barentshouse, Kirkenes
20 storey office building. Timber only
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Timber high-rise
- We found that timber high-rise buildings are feasible from an engineering point of view
- Timber high-rise buildings are a good answer to sustainable building in urban areas
- The cost of building is somewhat higher than steel/concrete. But erection time is shorter.
- The carbon footprint is favourable
- These buildings can be aesthically pleasing in their design- These buildings can be aesthically pleasing in their design
- Many people want such buildings.
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Melbourne, Australia – 10 storey building
10 storey CLT building. Presently regarded as the tallest timber apartment building in the world.
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Bergen, Norway – 14 storey building
Hot candidate to become the tallest timber apartment pbuilding this year!
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Project group
In 2010 Bergen- og omegn boligbyggelag (BOB), a Norwegian housing association proclaims that theyNorwegian housing association, proclaims that they want to build the world’s tallest timber building.
The following project group is establishedThe following project group is established
Sweco – engineering
Artec architectureArtec – architecture
Moelven – glulam and CLT structures
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Kodumaja – building modules
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Location
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Location
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The plot in Bergen
Hurtigruten – coastal ship
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Experience with timber structures
Sakyamuni pagoda - 1056
67 3 m tall including• 67.3 m tall – including the 11.3 m spire on top
• Maybe the tallest ytimber building on the planet todayI Si h th k• In Sichuan, earthquake zone in western China
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Experience with timber structures
Stave churches of Norway
Hopperstad stave churchHopperstad stave church
Built between 1150-1200
One of 40 remaining churches
Timber is durable!
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1996 - Evenstad bridge 180 m longExperience with timber bridges
1996 - Evenstad bridge. 180 m longDesigned for two lane full traffic
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Experience with timber bridges
2006 – Rena military bridge. 156 m long. Designed for 100 tonn tanks! Extreme loads.
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2011 – Bridge crossing the motorway outside OsloExperience with timber bridges
2011 – Bridge crossing the motorway outside Oslo airport. 50 m span
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Inspiration from timber bridges
• Technology developed for timber bridges over the last decades opens many doors.
• The experience gained from bridges can be used for tall buildings
•
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We chose to se pro en technolog for connections of
Engineering choices - 1- We chose to use proven technology for connections of
large timber structures. Slotted-in steel plates and dowels.
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The connection as de eloped for the Ol mpics in 1994
Engineering choices - 1- The connection was developed for the Olympics in 1994.
It handles very large forces in arenas and bridges.
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We sed gl lam tr sses for this 5 store comple in 2005
Engineering choices - 2- We used glulam trusses for this 5 storey complex in 2005.
This was a success, and was used as a basis for high-rise
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To red ce the ork on site and red ce b ilding time e
Engineering choices - 3- To reduce the work on site and reduce building time, we
wanted to prefabricate as much as possible.
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Engineering choices - 3
- Conventional prefabricated building modules can be stacked up to 6 storeys high. 14 storeys is too much, therefore an additional load bearing system is necessarytherefore an additional load bearing system is necessary.Stacking 4 storeys is quite economical.
Variants of b ilding mod les sho ld be held to a minim m- Variants of building modules should be held to a minimum to ensure lowest possible cost. In this way a serial production of modules can be donep
- Using modules reduces the challenge with water/moisture in the building phase considerablyin the building phase considerably
- The modules from Kodumaja are based on timber frame.
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- Each module/apartment complies with the passive house standard
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Engineering choices - 3
The basis is timber frame work Timber beams in floor andThe basis is timber frame work. Timber beams in floor and roof. Plasterboard. Oak parquet. Dishwasher. Cupboards. Kitchen. Shower. Tiles etc.
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All technical installations such as sprinklers, electricity, water pipes, cable tv etc are also integrated in the modules
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Engineering choices - 4
- A more or less regular geometry was chosen for the building.
- This is easier to build and design
- Building an extravagant structure or shape would have led g g pto increased costs.Maybe next time?
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Engineering choices - 5
- Fire design is done according to the Eurocode.
- Timber can burn. But the good thing is that we know how it burns. In this project the glulam is so thick that we allow it to burn for 90 minutes without failing. No extra gypsum is sedis used.
- All steel connections are hidden inside the timber. In this it ill t f il ithi th i d fi i t tiway it will not fail within the required fire resistance time
- In addition there are sprinklers, pressurized escape stairs and painted surfaces to improve the fire safety
- Norwegian regulations open up for alternative solutions as
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long as they can be documented
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Engineering choices - 5
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Engineering choices - 6
- To limit the need for maintenance a permanent weather protection system was chosen.
- The north and south facades have glass to protect the timber structure
- The east and south facades have metal cladding
- In this way the timber can be regarded as protected, andIn this way the timber can be regarded as protected, and a higher utilization in wood design is possible (Eurocode serviceclass 1)
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Engineering choices - 7
- The building has both gluelaminated (glulam) timber and cross-laminated timber (CLT, CNC). Both materials are produced with very high quality and millimeter precisionproduced with very high quality and millimeter precision
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Engineering choices - 7
- The main load bearing is handled by glulam alone. CLT is carrying the staircases, elevator shaft (15 storeys) and some inner walls but is not connected to the glulamsome inner walls, but is not connected to the glulam
- Connecting glulam and CLT would have led to complications in o r design that e are not comfortablecomplications in our design that we are not comfortable with yet
C t d k d th l l i th b ildi t- Concrete decks are used on three levels in the building to improve dynamic behavior
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Typical plan
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Assembly. Step by step
A blAssembly
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Facts550 3 l l- 550 m3 glulam
- 385 m3 CLT
- 45 m high
- The building stands on top of a concrete garage.
- Pile foundations
- Light weight building > tension anchorages
- Drawn in Revit. 3D
- Calculated using Robot
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Millenium Structure
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More facts
- 70 mm max deflection
Gl l i ll- Glulam carries allvertical load
Concrete decks serve- Concrete decks serveas extra weight, andplatform for modulesp
- New expression:powerstorey
- Max acceleration in the top about 0,05
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m/s2
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Even more factsL l l ti- Large glulam sections are block glued
Glulam quality GL 30c and GL- Glulam quality GL 30c and GL 30h according to EN 14080
Modules are stacked up to 4- Modules are stacked up to 4storeys, and are only connected to the main structure in the lowest module
- Typical column: 405x650 and 495x495 mm
- Typical diagonal 405x405 mm.
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… and then some factsTh b ildi i ffi i t d t th E- The building is energy efficient, and meets the European demands for passive house
Every module is insulated and almost air tight Joints- Every module is insulated and almost air tight. Joints between modules are handled likewise
The modular system gives double walls between- The modular system gives double walls between apartments. Acoustic requirements are well within limits for apartment buildingsg
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Structural model
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Finding damping of modules
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Modelling of modulesD i f d l ll h- Damping of modular walls has been physically tested and simulated
- NTNU (University of Trondheim) and Kodumaja of Estonia has jcontributed to this
- The building modules havega damping of about 3%
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Monitoring of the building by NTNUAccelerometers- Accelerometers
- Directions and speed of thespeed of the wind is measured
- Gives useful- Gives useful knowledge for future projects
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Main challenges
- Comfort criteria. Low weight -> higher accelerations
- Obtaining structural data for building modules
- Safe work operations in the air
- Avoiding moisture during erectiong g
- Designing maintenance friendly solutions
- Project economy Risk control to avoid overpricing from- Project economy. Risk control to avoid overpricing from suppliers not familiar with the concept
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Status today
Practically all costs have been covered by BOB.
Building costs are somewhat higher than steel+concrete
Detailed design is finished and approved by third party reviewers.
The project was put out for sale summer 2013.
31 of the 62 apartments are sold as of Jan 19th 201331 of the 62 apartments are sold as of Jan 19 2013
An additional 3 apartments must be sold before construction work can start.
Construction will most probably start this spring
Buy your apartment here: www treetsameie no
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Buy your apartment here: www.treetsameie.no
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Conclusive remarksTimber high-rise buildings
are for real!
Timber high-rise is a sustainable solution
Start planning your high-rise timber buildings
Take the wood industry of North America to the next level so that you canlevel, so that you can build using local material!
Challenge the world record!
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Challenge the world record!
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Thank you for your attention!
Visit ut next year!next year!
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