structural design of mass timber framing systems northeast wood design symposium tanya luthi, p.e. fast +epp september26, 2018 Disclaimer: This presentation was developed by a third party and is not funded by WoodWorksor the Softwood Lumber Board
Copyright Materials This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the presentation without written permission of the speaker is prohibited. Fast + Epp 2018
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.
course description Mass timber structural framing systems have high strength-to-weight ratios, are dimensionally stable, and are quickly becoming systems of choice for sustainably minded designers. This presentation will provide a detailed look at the structural design processes associated with a variety of mass timber products, including glued-laminated timber (glulam), cross-laminated timber (CLT), and naillaminated timber (NLT). Applications for the use of these products in gravity force-resisting systems under modern building codes will be discussed. Other technical topics will include use of mass timber panels as two-way spanning slabs, connection options and design considerations, and detailing and construction best practices.
Attheendofthiscourse,participantswillbeableto: 1. Discuss mass timber products and building systems and their possibilities as structural framing. 2. Compare structural properties and performance characteristics of mass timber products and review their unique design considerations. 3. Review structural design steps for members and connections in common mass timber framing systems. 4. Highlight structural detailing best practices to address items such as shrinkage and expansion, load path continuity, and speed of construction. learning objectives
1 gravity framing 2 lateral systems 3 connections overview
gravity framing nail-laminated timber (NLT) structural composite lumber (LSL, LVL) cross-laminated timber (CLT) glulam panels (GLT) wood-concrete composites decks plank decking
gravity framing 2x joists at 38mm (1-1/2 ) choose: depth, profile species, grade continuousvs. butt-jointed laminations NLT design
gravity framing detail for shrinkage and swelling NLT design
gravity framing design guide thinkwood.com NLT design
gravity framing beam on the flat A A A A A A A A A A A GLT design
gravity framing detail for shrinkage and swelling GLT design
gravity framing dimensional stability APA PRG 320 defines structural grades panel sizes vary by supplier cross laminations reduce strength and stiffness in primary span direction CLT design
gravity framing 2-way span capability CLT design
CLT design
gravity framing design guide thinkwood.com CLT design
gravity framing NLT may be most appropriate if: floor structure spans one way floor structure is curved in one direction budget is tight structure is an addition or alteration to an existing building (no crane access from above) a less manufactured aesthetic is desired decisions decisions...
gravity framing GLT may be most appropriate if: floor structure spans one way spans are long (no strength/stiffness reduction as for NLT with butt joints) a clean aesthetic is desired decisions decisions...
gravity framing CLT may be most appropriate if: floor structure needs to span in two directions (e.g. weak-axis cantilevers) a clean aesthetic is desired accommodating shrinkage and swelling during construction is difficult tight tolerances are required decisions decisions...
gravity framing 2x4 NLT, 3 GLT, 3-ply CLT (4 ±) 12 approx. L/40 2x6 NLT, 5 GLT, 5-ply CLT (7 ±) 10 17 approx. L/20 to L/40 typical spans
gravity framing 2x8 NLT, 7 GLT 14 21 approx. L/24 to L/36 2x10 NLT, 8 1/2 GLT, 7-ply CLT (10 ±) 17 24 approx. L/22 to L/34 typical spans
gravity framing 2x12 NLT, 9-ply CLT (12 ±) 20 26 approx. L/20 to L/28 typical spans
gravity framing deflections include creep ponding effects for concrete toppings? vibrations when in doubt, calculate accelerations! damping values? AISC Design Guide 11 (2 nd Edition) CSA O86 Annex A NBC 2015 Structural Commentary D ISO 10137 serviceability
1 gravity framing 2 lateral systems 3 connections overview
lateral systems shear walls Photo Credit: Sissi Slotover-Smutny vertical LFRS
lateral systems rocking walls vertical LFRS rocking moment frames Illustration Credit: PresLam
Photo Credit: Equilibrium Consulting wood braced frames vertical LFRS hybrids (steel or concrete LFRS)
lateral systems wood, steel, or concrete? walls or frames? code approvals building height and lateral load demands designing for resilience? architectural and planning considerations decisions decisions...
diaphragms
diaphragms lateral systems
lateral systems white paper Brenemanet al, An Approach to CLT Diaphragm Modeling for Seismic Design with Application to a U.S. High-Rise Project design example Structurlamet al, CLT Horizontal Diaphragm Design Example CLT diaphragm design aids
1 gravity framing 2 lateral systems 3 connections overview
the devil is in the details what s your philosophy? connections
connections in concrete Photo Credit: Reiulf Ramstad Arkitekter
Photo Credit: Cast Connex connections in steel Photo Credit: Ben McMillan
connections in steel
Photo Credit: Simpson StrongTie connections in stick frame
Photo Credits: Fire Tower Engineered Timber connections in timber frame
Photo Credit: TimberPlates.com Photo Credit: VicBeam Photo Credit: Uihlein-Wilson Architects connections timber? in hybrids and mass
connections timber? in hybrids and mass Photo Credits: Shigeru Ban Architects
connections make it buildable make it beautiful and don t forget about mother nature what s philosophy? your
column connection tallwoodhouse at brock commons
column connection tallwoodhouse at brock commons
column connection Photo Credit: Seagate Structures
column connection tallwoodhouse at brock commons
2 tallwoodhouse at brock commons 1.5 Deflection (in) 1 0.5 0 Dead Load Elastic Live Load Elastic Longitudinal Shrinkage Creep and Joint Settlement Total column connection
column connection tallwoodhouse at brock commons
column connection tallwoodhouse at brock commons
column connection
mec head office a a Photo Credit: DGS Construction a -a beam saddle
mec head office Photo Credit: DGS Construction beam saddle
wilsonschool of design a a Photo Credit: DGS Construction tight-fit pin shear connection a - a
tight-fit pin shear connection wilsonschool of design
tight-fit pin shear connection wilsonschool of design
ubc bus shelters Photo Credit: PUBLIC self-tapping screws
ubc bus shelters Photo Credit: SFS Intec self-tapping screws
self-tapping screws ubc bus shelters
self-tapping screws ubc bus shelters
HSK plate moment connection whistler gateway loop
HSK plate moment connection whistler gateway loop
whistler gateway loop Photo Credit: TiComTec HSK plate moment connection
HSK plate moment connection whistler gateway loop
grandviewheights aquatic centre Photo Credits: Ema Peter tension splice
grandviewheights aquatic centre PLAN VIEW tension splice
tension splice grandviewheights aquatic centre
tension splice grandviewheights aquatic centre
tension splice grandviewheights aquatic centre
arena stage performing arts center Photo Credit: Nic Lehoux steel casting
arena stage performing arts center Photo Credit: Nic Lehoux steel casting
arena stage performing arts center Image Credits: StructureCraft Builders steel casting
shrinkage crack reinforcement richmond olympicoval
a richmond olympicoval a a -a shrinkage crack reinforcement
shrinkage crack reinforcement richmond olympicoval
first principles it s not rocket science, but you re not just a structural engineer anymore in closing
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