Construction of Treet -How and Why -...

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Construction of Treet - How and Why

Vancouver, 2016-01-22

Ole Herbrand Kleppe. Project chief. BOB. Bergen, NorwayRune Abrahamsen. CEO. Moelven Industries, Moelv, Norway

2016 International Wood Symposium. Vancouver

BOB – HISTORY AND MISSION

BOB IS A CORPORATE HOUSING ASSOCIATION

- Founded in 1941

- 65.000 members

- Real Estate Management of more than 23.000 apartments

- 80 employees

BOB HAVE CLEAR GOALS

- BOB shall take a leading role in urban development, focusing on energy efficiency, sustainability and outdoor environment

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Where is Bergen?


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[email protected] - styresamling okt 20115

THE TREE

WHY?????

THE TREE – TIME SCHEDULE

- Masterplan started in 2005

- The idea of a timber building launched in 2007 (12 storeys)

- Masterplan approved in 2009

- Design engineering started in 2010

- Detailed engineering startet in 2012

- Building permit given in 2013

- Ground and concrete works started early May 2014

- Residents moved in December 2015

THE TREE

Project goals

- Sustainable, cost efficient urban high rise wooden house

- Industrial process

- Prefabrication

- Lets make LEGO!

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- To reduce work on site and reduce building time, we wanted to prefabricate as much as possible.

Prefabrication. Quicker installation


Timber frame modules

Each modular apartment complies with the passive house standard. Double walls and floors = super acoustics

Moelven Industries


96 m roof span

Moelven Industries

What is Moelven, in a nutshell?

Moelven is an enterprise that for more than 100 years has supplied wood-based products and services through honest work, in a responsible and timely manner.

Moelven produces at 50 locations in north Europe and employs 3,400 people.

Moelven is at the forefront, uses opportunities and will without a doubt exist for another 100 years. At least.


Moelven Industries


Glulam, productionOffices

Offices

Furnishing, production

Building modules, production

Offices

ElectroOffices

Timber, productionOffices

Wood, productionOffices

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CONCEPT PHASE IN 2010 CHOSEN CONCEPT

Timber bridges

2005 – Kjøllsæterbrua, Rena. 156 m long. 5 spans. Designed for heavy military traffic. Continuous timber truss. World’s strongest timber bridge


Steien bridge. Being constructed now

Road bridge. 89 m span. Network arch bridge


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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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Treet - Inspiration from timber bridges


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Innovative structural system

- 550 m3 glulam made of Norway spruce

- 385 m3 CLT produced by the German manufacturer Merk

- The building stands on top of a concrete garagepiled to the bedrock

- Light weight building > tension anchorages.

- Drawn in Revit. 3D. BIM


CLT in the building

365 m3Norway spruce

Dimension 120mm –200mm

Element widths up to 3 m

Length up to 20 m

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CLT in the building

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What is a tall timber building?

- WCTE 2016 in Vienna:Mini-symposium on tall timber buildings

- “We will only include buildings with a timber lateral load resisting system (not those with concrete shear cores or steel towers)»

- The Treet project complies with this

- A building where the majority of structural building components is made of wood is a timber building, I would say


• Modules are stacked up to four levels high, and are only connected to the main structure in the lowest module in each stack

• Single level modules in the power storeys

Building modules

2016 International Wood Symposium. Vancouver 24

Unique structural system


- Calculated using the software Robot

- Glulam carries allvertical and horizontal loads

- 71 mm max horizontal deflection (Level 14)

- CLT is used in the staircases, elevator shaft (15 st.), some inner walls and balconies, but is not structurally connected to the glulam

- Prefabricated timber frame building modules are stacked inside the “cabinet rack”

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Concrete slabs

Prefab. concrete slabs on top of levels 5, 10 and 13./14. have several functions:

- Foundation for modules

- Adds mass to the structure which improves the dynamic behavior

- Temporary roof during construction

- We could have made these slabs of wood. That would not have been smart


Block glued glulam


- Large glulam sections are block glued

- Typical column: 405x650 and 495x495 mm

- Typical diagonal 405x405 mm.

- Glulam quality GL 30c and GL 30h according to EN 14080

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Durability 67.3 m tall

Built 1052Built 1150


- To limit the need for maintenance a permanent weather protection system was chosen.

- The north and south façades are glassed in to protect the timber structure

- The east and south façades have metal cladding

- In this way the timber can be regarded as protected

Maintenance and exposure of wood


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- To limit the need for maintenance a permanent weather protection system was chosen.

- The north and south façades are glassed in to protect the timber structure

- The east and south façades have metal cladding

- In this way the timber can be regarded as protected

Maintenance and exposure of wood


Typical plan


- Timber is not preaccepted for highrises in Norway. However, Norwegian regulations open up for alternate materials as long as required documentation is produced

- Structural fire design of timber was done according to the Eurocode 1995-1-2. Reduced cross-section method.

- Timber can burn. In this project the glulam is so thick that we allow it to burn for 90 minutes without failing. No extra gypsum is used on the glulam. Modules are also R90.

- Calculations show that a fire within an apartment will self-extinct before the fire can spread

- All steel connections are hidden inside the timber. In this way it will not fail within the required fire resistance time

- In addition there are sprinklers, pressurized escape stairs, fire elevator and painted surfaces to improve fire safety

Structural fire design


FIRE CONCEPT

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Fire protection of connection slots

2.5mm intumescent strip - Intumex L

Expands 20 times at 150 degrees Celsius

- The light weight building system can handle seismic loading quite well

- The bottom stack of modules is designed for a moderate seismic load

- The main building is not designed for seismic effects

- The local ground acceleration is small

Seismic design


Lack of information on dynamic values. Testing was needed!

Norwegian University of Science and Technology, NTNU, performed the tests.

The Estonian company Kodumaja provided modules.

Non destructive testing of similar modules.

Impact hammer and accelerometers.

Serviceability


• Values found from testing was used in the design

• Residents in the top floors might in rare cases feel vibrations, but it is very unlikely that they will become uncomfortable.

• The chosen structural solution for "The tree" using glulam truss works and stacked prefabricated building modules gives a robust design and most probably insignificant effects from vibrations caused by wind exposure.

• The building will be monitored in the future to find actual accelerations and damping values. These experiences will be shared

• Storm in late December. No reports of people feeling uncomfortable

Summary of findings, accelerations


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ASSEMBLY PROCEDURE

LASTEBÅTMODULER

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3 4

5 =1 - 4

8 79

6 = 1 - 4

THE TREE

FACTS

- 62 apartments

- 5.830 m2 (net area)

- 14 storeys high (15 with basement)

- 52,8 meters high (from the sea side)

- Elevator shaft in CLT – 15 storeys high

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THE TREE

ECO FACTS

- Treet is storing 2.000 tonns of CO2

- Passive house (low energy demands for heating)

- Shared electrical car

- Only 25 parkingplaces for 62 apartments

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Major challenges

- Climate in Bergen

- Logistics

THE TREE THE TREE

Tolerances

- 25 mm between modules and glulam

- Deviations during construction can not occur

- GeoSurvey measured all installations

- Moelven preassembled all frames in factory

- Shrinkage of modules after installation

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Time-lapse from construction


http://www.sweco.no/no/Norway/Nyheter/2014/Webcam_Treet/

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Thanks for the attention so far. Let’s have lunch!


Construction of Treet -How and Why -...

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