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Aspen Art Museum
Creating Innovative Wood Structure
Greg Kingsley, PE, Peng, PhDCEOKL&A Inc., Structural Engineers and Builders
Disclaimer: This presentation was developed by a third party and is not funded by
WoodWorks or the Softwood Lumber Board.
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“The Wood Products Council” is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES), Provider #G516.
Credit(s) earned on completion of this course will be reported to AIA CES for AIA members. Certificates of Completion for both AIA members and non-AIA members are available upon request.
This course is registered with AIA CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product.
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Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
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Course Description
The Aspen Art Museum, designed by architect Shigeru Ban, includes a long-span three-dimensional wood space-frame roof.
Ban’s charge was to create a wood space frame with spans of more than 50 feet and cantilevers of 14 feet, in a structural depth of 3 feet. The space frame was to have two planes of intersecting diagonal webs of curved members that undulated up and down to touch the planes of the top and bottom chords with no visible connectors.
This case study presentation will describe the design and construction of the wood structure, including paths explored but not chosen for the final design.
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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.
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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
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BIRCH PLYWOOD WEB AFTER GLUING
with PURBOND HB E452 single-component polyurethane adhesive
Test
Coupons
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The Learning Objectives 1
Articulate the particular demands associated with creating a 3-dimensional space frame entirely in wood.
• Design challenge centers on the nodes and connections.
• Wood is orthotropic: you must orient the wood fibers to your advantage.
• Curved space frame members are beautiful, and yet at odds with their structural function.
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The Learning Objectives 2
Recognize the advantages and disadvantages of several wood connection strategies in space-frame structures.
• Knife plates and bolts are expensive and do not take the best advantage of the wood properties
• Notches in half-lap joints dramatically reduce the strength of wood
• Screws create strong, redundant wood connections
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The Learning Objectives 3
Be aware of manufacturing capabilities and limitations that influenced the design of the Aspen Art Museum roof structure.
• Preparation of precision virtual models is essential.
• CNC fabrication enabled the process
• Engineered wood products were essential
• Hardwood helped
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The Learning Objectives 4
Understand the importance of early engagement of manufacturing and engineering partners in the design process for innovative wood structures.
• I can’t state the answer better than that.
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Questions?
This concludes The American Institute of Architects Continuing Education Systems Course
Greg Kingsley
KL&A Inc., Structural Engineers and Builders