structural design of mass timber framing systems

structural design of mass timber framing systems nwwood design symposium -seattle davin lewis, p.e., p.eng. fast +epp july19, 2018 Disclaimer: This presentation was developed by a third party and is not funded by WoodWorks or 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. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.

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.

At the end of this course, participants will be able to: 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

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1 2 3 4 5 wood properties design standards gravity framing lateral systems connections overview

anisotropy wood properties

wood properties 5,000 psi A36 SPF concrete steel No.2 compression 1 2.3 3.4 tension 1 28 16 strength to weight

wood properties modulus of elasticity 1,000 2,000 ksi 5,000 psi A36 SPF concrete steel No.2 stiffness to weight 1 2.2 2.0 stiffness

wood properties Source: US Forest Products Laboratory shrinkage and swelling Illustration Credit: Geoff s W oodwork

shrinkage and swelling wood properties

creep wood properties

wood properties Im age : IsoStore acoustics

1 2 3 4 5 wood properties design standards gravity framing lateral systems connections overview

codes design standards

design standards common holes mockups delegated design items weather protection tolerances sealers (coordinate with Division 09) structural specifications

1 2 3 4 5 wood properties design standards gravity framing lateral systems connections overview

gravity framing strength axial bending shear bearing post-fire? serviceability deflections (including creep) vibrations design checks

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 continuous vs. 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 Im age Credit: CadMakers Photo Credit: Seagate Structures openings

1 2 3 4 5 wood properties design standards gravity framing lateral systems connections overview

lateral systems strength shear overturning capacity design (high seismic zones) serviceability story drift wind-induced vibrations (tall structures) design checks

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

1 2 3 4 5 wood properties design standards gravity framing lateral systems 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 tallwood house at brock commons

column connection Photo Credit: Seagate Structures

column connection tallwood house at brock commons

2 tallwood house at brock commons 1.5 Deflection (in) 1 0.5 0 Dead Loa d E las tic Li v e L oa d E l as ti c Lo n g itu d i na l Shrinkage Creep and Joint Settlement Tot al column connection

column connection tallwood house 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

wilson school of design a a Photo Credit: DGS Construction tight-fit pin shear connection a - a

tight-fit pin shear connection wilson school 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

HSK plate moment connection whistler gateway loop

whistler gateway loop Photo Credit: TiComTec HSK plate moment connection

HSK plate moment connection whistler gateway loop

grandview heights aquatic centre Photo Credits: Ema Peter tension splice

grandview heights aquatic centre PLAN VIEW tension splice

tension splice grandview heights aquatic centre

arena stage performing arts center Photo Credit: Nic Lehoux steel casting

arena stage performing arts center Im age Credits: StructureCraft Builders steel casting

shrinkage crack reinforcement richmond olympic oval

a richmond olympic oval a a - a shrinkage crack reinforcement

shrinkage crack reinforcement richmond olympic oval

first principles it s not rocket science, but you re not just a structural engineer anymore in closing

This concludes the American Institute of Architects Continuing Education Systems Course Davin Lewis dlewis@fastepp.com www.fastepp.com thank you