Aspen Art Museum - WoodWorks · 2018-12-17 · Course Description The Aspen Art Museum, designed by...

AspenArtMuseumDesignandConstructionoftheWoodRoofStructure

GregKingsley,PE,Peng,PhDPresidentandCEOKL&AInc.,StructuralEngineersandBuilders

Disclaimer: This presentation was developed by a third party and is not funded by WoodWorks or the Softwood Lumber Board.

“TheWoodProductsCouncil” isaRegisteredProviderwithTheAmericanInstituteofArchitectsContinuingEducationSystems(AIA/CES),Provider#G516.

Credit(s)earnedoncompletionofthiscoursewillbereportedtoAIACESforAIAmembers.CertificatesofCompletionforbothAIAmembersandnon-AIAmembersareavailableuponrequest.

ThiscourseisregisteredwithAIACES forcontinuingprofessionaleducation.Assuch,itdoesnotincludecontentthatmaybedeemedorconstruedtobeanapprovalorendorsementbytheAIAofanymaterialofconstructionoranymethodormannerofhandling,using,distributing,ordealinginanymaterialorproduct.__________________________________

Questionsrelatedtospecificmaterials,methods,andserviceswillbeaddressedattheconclusionofthispresentation.

Course DescriptionTheAspenArtMuseum,designedbyarchitectShigeruBan,includesalong-spanthree-dimensionalwoodspace-frameroof.

Ban’schargewastocreateawoodspaceframewithspansofmorethan50feetandcantileversof14feet,inastructuraldepthof3feet.Thespaceframewastohavetwoplanesofintersectingdiagonalwebsofcurvedmembersthatundulatedupanddowntotouchtheplanesofthetopandbottomchordswithnovisibleconnectors.

Thiscasestudypresentationwilldescribethedesignandconstructionofthewoodstructure,includingpathsexploredbutnotchosenforthefinaldesign.

Learning Objectives

1. Articulate the particular demands associated with creating a 3-dimensional space frame entirely in wood.

2. Recognize the advantages and disadvantages of several wood connection strategies in space-frame structures.

3. Be aware of manufacturing capabilities and limitations that influenced the design of the Aspen Art Museum roof structure.

4. Understand the importance of early engagement of manufacturing and engineering partners in the design process for innovative wood structures.

Aspen Art Museum

THE PLAYERS

Shigeru Ban,Shigeru Ban Architects

Hermann Blumer,Creation Holz

Ted Hall, Spearhead

OUTLINE• THE BUILDING CONCEPT

• THE ARCHITECT’S CONCEPT FOR THE ROOF

• 4 STRUCTURAL CONCEPTS FOR THE ROOF

• FABRICATION TESTS: MOCK UPS

• STRENGTH TESTS: MATERIAL TESTING

• FINAL FABRICATION

• ERECTION

• FINISHED BUILDING

THE BUILDING CONCEPT

Aspen, Colorado, USA

Snow load = ~ 90 psf

Early rendering – view up the main stair

Early rendering – 3rd floor terrace with wood space frame

BASEMENT GROUND LEVEL

FLOOR PLANS

2ND FLOOR 3RD FLOOR

FLOOR PLANS

3RD FLOOR REFLECTED CEILING PLAN

100 ft x 100 ft on a 4 ft grid Max span = ~ 50ft

BUILDING SECTIONMaximum 3 ft structural depth

THE ARCHITECT’S CONCEPT

STRUCTURAL CONCEPTS

THREE ATTEMPTS AND FAILURES …

AND THE FINAL ROAD TO SUCCESS

1ST CONCEPT:

REINFORCED LAP SPLICES WITH DEHONIT COMPOSITE MATERIAL

2ND CONCEPT:

KNIFE PLATES WITH TIGHT DRIVEN PINS

3RD CONCEPT:

MICRO LAMINATIONS CROSSING AT JOINTS WITH NO HALF LAPS

CNCCutting

Hermann in Paris

FINAL CONCEPT:

KERTO CHORDS

BIRCH PLYWOOD WEBS

HALF-LAPPED JOINTS

FULL-THREAD SCREW CONNECTIONS

KERTO BOTTOM CHORD – LAYER 1

KERTO BOTTOM CHORD – LAYER 2

BIRCH PLYWOOD WEB – LAYER 1

BIRCH PLYWOOD WEB – LAYER 2

KERTO TOP CHORD – LAYER 1

KERTO TOP CHORD – LAYER 2

Kerto S LVL Chords

WHY PLYWOOD?

Birch Plywood Diagonals

BIRCH PLYWOOD LAYUP

31 1.5 mm laminations

BIRCH PLYWOOD WEB SPLICING PATTERN

(3.6 m plywood sheet length)

Why Birch?

Connection concept(178 mm wide birch web)

(172 mm wide x 133 mm deep Kerto S chord)


(178 mm wide birch web)

4-SCREW JOINT

8-SCREW JOINT

12-SCREW JOINT

15-SCREW JOINT

15-SCREW JOINT

(178 mm wide birch web)


TRUSS FABRICATION MODEL OVERVIEW

STRUCTURAL MODEL

DEFORMATIONS

NORMAL FORCES – TOP CHORD

NORMAL FORCES - WEBS

NORMAL FORCES – BOTTOM CHORD

THE MOCK-UP

TESTING

BIRCH PLYWOOD LAYUP

BIRCH PLYWOOD TEST SPECIMENS

10k~5,600 psi

SHOP FABRICATION

Kerto LVL Chords

Birch Plywood Diagonals

BIRCH PLYWOOD LAMINATIONS

THE “LIBRARY”

LAYOUT OF BIRCH PLYWOOD IN PREPARATION FOR GLUING

GLUE VOLUME QC

GLUING OPERATIONS

THE “CLAMP”

CLAMPING

BIRCH PLYWOOD WEB AFTER GLUING with PURBOND HB E452 single-component polyurethane adhesive

TestCoupons

BIRCH PLYWOOD WEB PRODUCTION

BIRCH PLYWOOD WEBS READY TO SHIP (NOTE THICKENED WEBS AT COLUMN LOCATION)

SITE CONSTRUCTION

TOP OF THE THIRD FLOOR STRUCTURE, READY FOR WOOD SPACE FRAME INSTALLATION

SCAFFOLDING

BOTTOM CHORDS

Bottom Chords

WEB SPLICES

COLUMN CONNECTION

8-SCREW CONNECTION (Top) 4-SCREW CONNECTION (Bottom)

15-SCREW CONNECTION

Quality Control

Screw connections

4

8

8

12

4

20,000 SCREWS -7°C (20° F)

Pulling the shores …

COMPLETED PROJECT

WHAT WE LEARNED

WHAT WE LEARNEDObjective 1Design challenge centers on the nodes and connections.

“Structures are connections held together by members.”

- Hardy Cross

Wood is orthotropic.

With engineered wood products, you can orient the wood fibers to your advantage.

WHAT WE LEARNEDObjective 1

Curved space frame members are beautiful, and yet at odds with their structural function.


Knife plates and bolts are expensive and do not always take the best advantage of the wood properties


Notches and half-lap joints dramaticallyreduce the strength of wood


Screws create strong, redundant wood connections


Preparation of precision virtual models for CNC fabrication is essential.


Design cannot be divorced from fabrication and construction process.


QUESTIONS?This concludes the

American Institute of Architects Continuing Education Systems Course

Aspen Art Museum - WoodWorks · 2018-12-17 · Course Description The Aspen Art Museum, designed by...

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