structural design of mass timber framing systems

Transcription

1 structural design of mass timber framing systems midwest wood solutions fair tanya luthi, p.e. fast +epp Disclaimer: This presentation was developed by a third party and is not funded by WoodWorks or the Softwood Lumber Board may 23, 2018

2 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

3 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.

4 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.

5 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 connectionsincommonmasstimberframing systems. 4. Highlight structural detailing best practices to address items such as shrinkage and expansion, load path continuity, and speed of construction. learning objectives

6 about our firm + Vancouver Canada + Frankfurt Germany + New York USA + Seattle USA + Edmonton Canada

7 wood properties design standards gravity framing lateral systems connections overview

8 anisotropy wood properties

9 wood properties 35 MPa A36 SPF concrete steel No.2 compression tension strength to weight

10 wood properties modulus of elasticity 1,000 2,000 ksi 35 MPa A36 SPF concrete steel No.2 stiffness to weight stiffness

11 wood properties Source: US Forest Products Laboratory shrinkage and swelling Illustration Credit: Geoff s Woodwork

12 shrinkage and swelling wood properties

13 creep wood properties

14 wood properties NDS D T = K cr D LT + D ST K cr = 1.5 or 2.0 Appendix F Eurocode 5 Service Class 1 K cr = 1.6 Service Class Service Class calculating creep

15 wood properties Image : IsoStore acoustics

16 wood properties north american codes NDS Supplement CSA O86 other resources US Forest Products Laboratory Wood Handbook AITC Timber Construction Manual APA Resource Library CWC Wood Design Manual Eurocode 5 resources

17 wood properties design standards gravity framing lateral systems connections overview

18 codes design standards

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

20 fabrication tolerances thickness/depth length width squareness straightness/camber design standards material standards: PRG 320, ANSI A190.1 CNC vs. hand cut specifying tolerances

21 erection tolerances position/elevation plumbness squareness levelness joints (size of gap) design standards dissimilar materials wood tolerances vs. concrete or steel specifying tolerances

22 design values per manufacturer read the fine print! adjustment factors service conditions fastener spacings and edge distances not all codes are created equal design standards proprietary products

23 wood properties design standards gravity framing lateral systems connections overview

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

25 gravity framing nail-laminated timber (NLT) structural composite lumber (LSL, LVL) cross-laminated timber (CLT) glulam panels (GLT) wood-concrete composites decks plank decking

26 gravity framing 2x joists at 38mm (1-1/2 ) choose: depth, profile species, grade continuous vs. butt-jointed laminations NLT design

27 gravity framing detail for shrinkage and swelling NLT design

28 gravity framing design guide thinkwood.com NLT design

29 gravity framing beam on the flat A A A A A A A A A A A GLT design

30 gravity framing detail for shrinkage and swelling GLT design

31 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

32 gravity framing 2-way span capability CLT design

33 CLT design

34 gravity framing design guide thinkwood.com CLT design

35 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...

36 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...

37 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...

38 gravity framing 2x4 NLT, 3 GLT, 3-ply CLT (4 ±) 12 approx. L/40 2x6 NLT, 5 GLT, 5-ply CLT (7 ±) approx. L/20 to L/40 typical spans

39 gravity framing 2x8 NLT, 7 GLT approx. L/24 to L/36 2x10 NLT, 8 1/2 GLT, 7-ply CLT (10 ±) approx. L/22 to L/34 typical spans

40 gravity framing 2x12 NLT, 9-ply CLT (12 ±) approx. L/20 to L/28 typical spans

41 deflections include creep ponding effects for concrete toppings? gravity framing 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 serviceability

42 gravity framing Image Credit: CadMakers Photo Credit: Seagate Structures openings

43 wood properties design standards gravity framing lateral systems connections overview

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

45 lateral systems shear walls Photo Credit: Sissi Slotover-Smutny vertical LFRS

46 lateral systems rocking walls vertical LFRS rocking moment frames Illustration Credit: PresLam

47 Photo Credit: Equilibrium Consulting wood braced frames vertical LFRS hybrids (steel or concrete LFRS)

48 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...

49 diaphragms

50 diaphragms lateral systems

51 lateral systems white paper Breneman et al, An Approach to CLT Diaphragm Modeling for Seismic Design with Application to a U.S. High-Rise Project design example Structurlam et al, CLT Horizontal Diaphragm Design Example CLT diaphragm design aids

52 wood properties design standards gravity framing lateral systems connections overview

53 the devil is in the details what s your philosophy? connections

54 connections in concrete Photo Credit: Reiulf Ramstad Arkitekter

55 Photo Credit: Cast Connex connections in steel Photo Credit: Ben McMillan

56 connections in steel

57 Photo Credit: Simpson StrongTie connections in stick frame

58 Photo Credits: Fire Tower Engineered Timber connections in timber frame

59 Photo Credit: TimberPlates.com Photo Credit: VicBeam Photo Credit: Uihlein-Wilson Architects connections timber? in hybrids and mass

60 connections timber? in hybrids and mass Photo Credits: Shigeru Ban Architects

61 connections make it buildable make it beautiful and don t forget about mother nature what s philosophy? your

62 column connection tallwood house at brock commons

63 column connection tallwood house at brock commons

64 column connection Photo Credit: Seagate Structures

65 column connection tallwood house at brock commons

66 2 tallwood house at brock commons 1.5 Deflection (in) Dead Load Elastic Live Load Elastic Longitudinal Shrinkage Creep and Joint Settlement Total column connection

67 column connection tallwood house at brock commons

68 column connection tallwood house at brock commons

69 column connection

70 mec head office a a Photo Credit: DGS Construction a - a beam saddle

71 mec head office Photo Credit: DGS Construction beam saddle

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

73 tight-fit pin shear connection wilson school of design

74 tight-fit pin shear connection wilson school of design

75 ubc bus shelters Photo Credit: PUBLIC self-tapping screws

76 ubc bus shelters Photo Credit: SFS Intec self-tapping screws

77 self-tapping screws ubc bus shelters

78 self-tapping screws ubc bus shelters

79 HSK plate moment connection whistler gateway loop

80 HSK plate moment connection whistler gateway loop

81 whistler gateway loop Photo Credit: TiComTec HSK plate moment connection

82 HSK plate moment connection whistler gateway loop

83 grandview heights aquatic centre Photo Credits: Ema Peter tension splice

84 grandview heights aquatic centre PLAN VIEW tension splice

85 tension splice grandview heights aquatic centre

86 tension splice grandview heights aquatic centre

87 tension splice grandview heights aquatic centre

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

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

90 arena stage performing arts center Image Credits: StructureCraft Builders steel casting

91 shrinkage crack reinforcement richmond olympic oval

92 a richmond olympic oval a a - a shrinkage crack reinforcement

93 shrinkage crack reinforcement richmond olympic oval

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

95 This concludes the American Institute of Architects Continuing Education Systems Course thank you Contact Us: 11th Floor, 41 East 11th St. New York, NY Tel: