Mjøstårnet - Construction Of An 81 M Tall Timber Building
Mjøstårnet – Construction of an 81 m talltimber buildingRune Abrahamsen, CEO, Moelven Limtre AS
This is Moelven One of Scandinavia's largestwood-processing groups 3,500 employees in 50 businessunits in Norway, Sweden andDenmark Production facilities in Norwayand Sweden 2016: Turnover of more than1 billion Euros Three divisions: Timber, Woodand Building Systems Moelven Limtre is part ofBuilding Systems
Moelven Limtre(Limtre Glulam)Established in 1959. 135 employeesProduces about 26 000 m3 per year in Norway and 35 000 m3per year in Sweden. No CLT production!Two factories in Norway. One in Sweden
Moelven projects96 m roof span
Treet in BergenCompleted 201551 m tallCombination ofglulam trusses,CLT staircases andprefabricatedbuilding modulesTrekonstruksjonsdagene Oslo 13-14 juni 2017
Mjøstårnet – where is it?140 km and 90mins drive northof Oslo60 mins drivenorth of OSLAirportTrekonstruksjonsdagene Oslo 13-14 juni 2017
Location – Brumunddal15 kmLocated next to highway E6 andMjøsa – Norway’s largest lake(120 km)
Mjøstårnet (The tower of lake Mjøsa)Building owner: ABInvest AS. Arthur andAnders Buchardt.– The Norwegiancontractor HENTbuilds Mjøstårnetfor AB Invest as aturnkey contract– Moelven Limtre isHENT’s sub‐contractor forstructural timbercomponents8
Visionary clientThe initiative to build Mjøstårnetcomes from Arthur Buchardt.His vision is that the project will bea symbol of the green shift, and aproof that tall buildings can be builtusing local resources, localsuppliers and sustainable woodenmaterials.9
Video about the Mjøstårnet project
From sketch to realityFebruary 2015:Arthur Buchardt’s sketchOctober 2017:Moelven Limtre AS
Companies involved in timber constructionMain contractor:Project architects:Timber structures:Engineering:CLT subcontractor:LVL in timber floors:Prefabricated elements:Cladding:12Project support:
Trä8 building system
Trä8 building system – optimized material useUse material only where you need it!
81 mSection18floors11300 m2
The structure at a glance– 30 m taller than Treet in Bergen,similar glulam structure but withoutbuilding modules– Glulam columns, beams and diagonals– CLT shafts for elevators and stairs– Wooden prefabricated façadeelements make up the buildingenvelope– Wooden slabs in the first ten floors.MoelvenTrä8‐elements– Concrete decks in the upper floors forapartments– 2600 m3 timber structures
More info from structural design‐ Timber engineering done by Swecofor Moelven Limtre‐ Calculated using the software Robot‐ Glulam is the primary load bearingfor all vertical and horizontal loads‐ CLT is used for secondary loadbearing of staircases and elevatorshafts, and is not structurallyconnected to the glulam‐ 140 mm max horizontal deflection(Level 18)17
More info from structural designPeak accelerationsaccording to ISO 10137.The Red dots are for level17 and the blue dots arefor level 18.We are on the limit onlevel 17, and slightlyabove on level 18. Theclient builds topapartment well aware ofthis18
Floor elements in MjøstårnetSpanwidth: 7,5 mR90 fire resistancePrefabricated wooden slabs in the first ten floors.MoelvenTrä8‐elements: Combination of glulam and LVLThe weight from the concrete decks in the six upper floors isneeded to handle comfort criteria and acoustics.
Production of glulam componentsBlock gluing of columnsProduction of truss diagonalsCorner column size:1485 mm x 625 mm
Webcam, videos, project info and more atwww.moelven.com/mjostarnet
Assembly of timber structures– Installation oftimber structuresstarted September2017– The building will betopped out May2018– Completed March2019. People canmove inTimber skeleton:Almost one floor perweek!
Installation of timber structuresCLT shafts
Installation of glulam structuresPreassembled frames. September 4
Installation of glulam structuresStatus 18 septemberCornercolumns:Maxcompression:11500 kNMax tension:5500 kN
Installation of glulam structuresStatus 18 september
Installation of glulam structuresStatus September 18
Installation of glulam structuresStatus October 26Corner column size:1485 mm x 625 mmTypical internalcolumns:725 mm x 810 mm625 mm x 625 mm
Installation of glulam structuresStatus November 8
Prefabricated facade elementsPanel size 50‐60 m2.Produced in a factoryclose to the building site
Installation of glulam structuresStatus December 4
Installation of glulam structuresStatus December 4
Installation of glulam structuresStatus December 4
Installation of glulam structuresStatus December 4
Installation of glulam structuresStatus December 4
Fire protection of connectionsR120 &Burnout2.5mm intumescent strip Intumex L. Expands 20 times at150 degrees Celsius
The temperature in the column centre after90 minutes of fire1000 ⁰C20 ⁰C90min90minTemperature inthe test ovenCross-section405 mm x 460 mm
Tall Wood imber/tall-woodgalleryTall Timber: A global Journal2017 IssueII TBIN.pdfThere is a racegoing on!
Tall Wood imber/tall-woodgalleryTall Timber: A global Journal2017 IssueII TBIN.pdf
CTBUH – Definition of timber buildingsThe council for tall buildings and urban habitat had theirinternational conference in Sydney in October 2017.A proposal was put forward to categorize differentconstruction approaches to tall timber buildings.A single-material tall building is defined as one wherethe main vertical and lateral structural elements andfloor systems are constructed from a single material.If a tall building is of steel or timber construction with afloor system of concrete planks or slab supported onsteel or timber beams, it is considered a steel or timberbuilding.40
CTBUH – Definition of timber buildings cont.A composite tall building utilizes a combination ofmaterials acting compositely in the main structuralelements, thus including an otherwise steel or timberbuilding with a concrete core.This proposal has been put forward to the CTBUHHeight and Data Committee for considerationBased on this we believe that Mjøstårnet is likely to bethe world’s tallest timber building upon completion41
Experiences and thoughts on tall timber Glulam is well suited for high rise buildings. Thelarge cross sections can handle fire requirementsDue to maintenance one should not expose timbermain load bearing to weatherCost of structure is cost competitiveAssembly is quick – everything prefabricatedCO2 footprint is considerably loweredExcess use of materials should be avoided, alsowhen it comes to wood materialsUsing only the materials you need and combiningwood, steel and concrete will result in “climate smartbuildings”.42
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CTBUH –Definition of timber buildings The council for tall buildings and urban habitat had their international conference in Sydney in October 2017. A proposal was put forward to categorize different construction approaches to tall timber buildings. A single-material tall building is defined as one where
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