david j. odeh, se principal hybrid mass timber + steel risd quad · 2020. 9. 22. · disclaimer:...
TRANSCRIPT
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David J. Odeh, SEPrincipal
Disclaimer: This presentation was developed by a third party and is not funded by WoodWorks or the Softwood Lumber Board
Hybrid Mass Timber + SteelRISD Quad
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RISD Quad New Residence HallKey Project Challenges§ Schedule and speed
§ Aggressive institution wide sustainability goals
§ Adjacent concrete flat plate dormitories
§ Design goal to create artist loft experience
§ Interest in mass timber
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Glued Laminated Timber
Structural Composite Lumber
Panelized Wood Products
Solid LumberCross Laminated Timber Dowel Laminated Timber
LVL
GLT
CLT
DLT
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Cross Laminated Timber§ Made with sapling lumber
§ Manufactured in up to 65’ lengths
§ Two-way action possible
§ Sequestered carbon
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IBC2015 Construction TypesAll heights assume NFPA 13 sprinkler system
Type 1 Type 3 Type 4 Type 5Noncombustible Noncombustible/
CombustibleHeavy Timber
Combustible
Occupancy A B A B A B
A,B,R None 180’ 85’ 75’ 85’ 70’ 60’
A-2, A-3A-4 None 12 4 4 4 3 2
B None 12 6 4 6 4 3
R-2 None 12 5 5 5 4 3
Height Limit
# of Stories
A: Interior structure fire rated
B: Interior mostly unrated
Can use Mass Timber in ALL types
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Height Limits – Type 3 and Type 4
85’ (3A,4)75’ (3B)
Max 5 StoriesMax 5 Stories
Type 1A Podium
Residential Dormitory (R-2)
above podium
Average Grade
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Minimum Heavy Timber Sizes (Type 4)Member Type Floor Framing Roof Framing
Column 8x8 6x6
Beam 6x10 6” minimum thickness
Floor Deck (solid or glu-lam)
4” nominal 2” nominal
Cross laminated timber 4” actual 3” nominal
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Choosing by AdvantagesOptions
§ Girder-slab (precast concrete with steel)
§ All glued laminated timber frame and decking
§ Steel-CLT hybrid
Key Factors§ Speed of construction
§ Sustainability
§ Aesthetic “look and feel”
§ Cost
§ Span and depth of members
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Overview: Hybrid CLT-Steel ConstructionFeatures§ Steel frame with CLT slabs
§ One-way CLT panels – entire building width
§ Construction Type
§ Type 1A construction – Below Lvl 2
§ Type 3B construction – Above Lvl 2
§ Exposed CLT ceilings
§ Topping slab and acoustic isolation mat for sound isolation
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Floor Assembly – Acoustic Separation§ IBC 2015 Sound Transmission
(1207)§ Sound Transmission Class >= 50§ Impact Insulation Class >=50
§ Final Assembly (USG Products):§ USG Levelrock SAM-N25 Ultra –
Sound Attenuation Mat§ USG Levelrock Sound Reduction
Board§ USG Levelrock 3500 Floor
Underlayment (2” min thickness)
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CLT in Exterior Wall Assembly§ IBC 2015 Requirements (602.4)§ Allowed in walls with 2 hour
rating or less§ Must be protected on exterior
surface
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Constructability ConsiderationsKey Issues§ Mix of trades – wood and
steel erector
§ Fasteners chosen for speed
§ Most holes field drilled –simplifies coordination
§ Diaphragm design using spline connectors
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All field connections bolted
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Unframed openings in floors
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Coordination of MEP systems
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Image courtesy of Shawmut Design and Construction
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Exterior Skin Construction
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Exterior Skin Construction
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Exterior Skin Construction
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This concludes The American Institute of Architects Continuing Education Systems CourseDavid J. OdehOdeh Engineers, [email protected]