Construction of Treet - How and Why

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1 BOB HISTORY AND MISSION BOB IS A CORPORATE HOUSING ASSOCIATION - Founded in members - Real Estate Management of more than apartments - 80 employees Construction of Treet - How and Why BOB HAVE CLEAR GOALS - BOB shall take a leading role in urban development, focusing on energy efficiency, sustainability and outdoor environment Vancouver, Ole Herbrand Kleppe. Project chief. BOB. Bergen, Norway Rune Abrahamsen. CEO. Moelven Industries, Moelv, Norway Where is Bergen? 2016 International Wood Symposium. 3 Vancouver 1

2 THE TREE WHY????? 5 terje.gilje@bob.no - styresamling okt THE TREE TIME SCHEDULE THE TREE - Masterplan started in The idea of a timber building launched in 2007 (12 storeys) - Masterplan approved in Design engineering started in Detailed engineering startet in Building permit given in Ground and concrete works started early May Residents moved in December 2015 Project goals - Sustainable, cost efficient urban high rise wooden house - Industrial process - Prefabrication - Lets make LEGO! 2

3 Prefabrication. Quicker installation - To reduce work on site and reduce building time, we wanted to prefabricate as much as possible. Timber frame modules Moelven Industries Each modular apartment complies with the passive house standard. Double walls and floors = super acoustics 96 m roof span Moelven Industries 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. Timber, production Offices Wood, production Offices Glulam, production Offices Building modules, production Offices Furnishing, production Offices Electro Offices 3

4 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 4

5 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 - Treet - Inspiration from timber bridges = Innovative structural system m 3 glulam made of Norway spruce m 3 CLT produced by the German manufacturer Merk - The building stands on top of a concrete garage piled to the bedrock - Light weight building > tension anchorages. - Drawn in Revit. 3D. BIM CLT in the building Dimension 120mm 200mm Element widths up to 3 m Length up to 20 m 365 m3 Norway spruce 2016 International Wood 19 Symposium. Vancouver 5

6 CLT in the building 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 2016 International Wood 22 Symposium. Vancouver Building modules 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 Unique structural system - Calculated using the software Robot - Glulam carries all vertical 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 2016 International Wood 24 Symposium. Vancouver 6

7 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 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 We could have made these slabs of wood. That would not have been smart 2016 International Wood 25 Symposium. Vancouver 2016 International Wood 26 Symposium. Vancouver Built 1150 Durability 67.3 m tall Built 1052 Maintenance and exposure of wood - 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 2016 International Wood 27 Symposium. Vancouver 7

8 Maintenance and exposure of wood Typical plan - 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 2016 International Wood Symposium. 30 Vancouver Structural fire design - Timber is not preaccepted for highrises in Norway. However, Norwegian regulations open up for alternate materials as long as required documentation is produced FIRE CONCEPT - Structural fire design of timber was done according to the Eurocode 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 8

9 Fire protection of connection slots Seismic design - 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 2.5mm intumescent strip - Intumex L Expands 20 times at 150 degrees Celsius Serviceability 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. Summary of findings, accelerations 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 9

10 ASSEMBLY PROCEDURE THE TREE 2 LASTEBÅT MODULER = =1-4 1 FACTS - 62 apartments m2 (net area) - 14 storeys high (15 with basement) - 52,8 meters high (from the sea side) - Elevator shaft in CLT 15 storeys high 10

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13 THE TREE ECO FACTS - Treet is storing tonns of CO 2 - Passive house (low energy demands for heating) - Shared electrical car - Only 25 parkingplaces for 62 apartments 13

14 THE TREE THE TREE Major challenges Tolerances - Climate in Bergen - Logistics - 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 Time-lapse from construction Thanks for the attention so far. Let s have lunch! 2016 International Wood Symposium. 55 Vancouver 2016 International Wood Symposium. 56 Vancouver 14