modern timber connections - wood works

Click here to load reader

Post on 11-Mar-2022

0 views

Category:

Documents

0 download

Embed Size (px)

TRANSCRIPT

PowerPoint PresentationGehloff Consulting Inc.
Tuesday, November 12th, 2013
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.
© Gehloff Consulting Inc. 2013
Program Education Credit Information
The Canadian Wood Council is a Registered Provider with the American Institute of
Architects. This course meets Continuing Education System requirements for one
Learning Unit. Credit earned on completion of this program will be reported to CES
Records for AIA members who provided their member number during the online
registration. This course also qualifies as Structured Learning with OAA. Certificates
of Completion for OAA members, and anyone else who indicated they wanted a
certificate, will be emailed after the event to those who requested them during the
registration process. We will also report participation to the Engineering Institute of
Canada on behalf of any engineers who requested their participation be recorded.
This program is registered with the 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. The
same is true for the OAA and EIC. Questions related to specific materials, methods,
and services will be addressed at the conclusion of this presentation.
4
Content
• Introduction • Applications
• as primary connector • as part of a connection system • as reinforcement
• Performance/Design(Guidance)
• Introduction • Applications
• as primary connector • as part of a connection system • as reinforcement
• Performance/Design(Guidance)
The not so Good;
• hygroscopic, none homogeneous, un-isotropic
tension perp. to grain
• Custom steel parts
• Custom steel parts
• Introduction • Applications
• as primary connector • as part of a connection system • as reinforcement
• Performance/Design(Guidance)
STS - Introduction
Self-tapping screws? (as supposed to self-drilling?) Self-drilling: self-drilling screws are for metal only and do not work (well) in wood, remove material Self-tapping: self-tapping screws work well in most materials, shaft designed to cut threads into the material as they are driven in
Gehloff Consulting Inc.
Why self-tapping screw?
1) Long threads creates high friction and drive-in torques pre-tapping reduces that friction and drive-in torque
2) Pre-tapping hole with intended diameter
Eliminates risk of oversized holes and reduces splitting
Gehloff Consulting Inc.
Source: Blass
Gehloff Consulting Inc.
• High withdrawal resistance
• Economic use in timber joints and reinforcements
Gehloff Consulting Inc.
• Introduction • Applications
• as primary connector • as part of a connection system • as reinforcement
• Performance/Design(Guidance)
Source: Blass
Source: SFS / HECO
Gehloff Consulting Inc.
Source: Colling
Source: HECO
Source: SFS
Source: UBC - TEAM
Gehloff Consulting Inc.
Source: UBC - TEAM
Gehloff Consulting Inc.
Source: Würth / SWG Gehloff Consulting Inc.
32
STS – Applications (as primary fastener)
30m high 77m free span + 12m cantilevers 12 x 115m long truss, 6.7m high 2,600 m³ glulam beams
Gehloff Consulting Inc. Source: Wiehag
12/10/2013
17
33
STS – Applications (as primary fastener)
Tension in lower chord: Fd = 3,500 kN, ultimate load: 13 MN Connection: 4 x 216 STS Ø 8 mm x 800 mm without pre-drilling
Gehloff Consulting Inc.
• Introduction • Applications
• as primary connector • as part of a connection system • as reinforcement
• Performance/Design(Guidance)
Source: SIGHA
Source: SIGHA
Source: KNAPP Gehloff Consulting Inc.
39
Source: Bohrenkaemper
Source: PITZL
Source: Sherpa / PITZL
Gehloff Consulting Inc.
Source: SFS
Source: SWG Gehloff Consulting Inc.
12/10/2013
22
44
Content
• Introduction • Applications
• as primary connector • as part of a connection system • as reinforcement
• Performance/Design(Guidance)
Gehloff Consulting Inc.
2 8 0
3 2 0
2 8 0
49
Verschiebung d in mm
Verschiebung d in mm
L a s t
Verschiebung d in mm
L a s t
Verschiebung d in mm
• Introduction • Applications
• as primary connector • as part of a connection system • as reinforcement
• Performance/Design(Guidance)


















STS – Performance/Design
• Fastener in shear: use CSA O86 (lag screw section) considering design parameters of chosen screw
• Fastener in tension: NO suitable guidance given in CSA- O86 use EC5 (EN1995)
• EN1995 (EC5): Standardization for all European countries by replacing the old national standards
• On a national level, national standards are still in place as “National Application Documents”
• Calculate the respective force components according to local codes or international codes if needed
Source: CSA-O86

Source: Bejtka Gehloff Consulting Inc.
69
r
4 h h h
12/10/2013
37
74
Content
• Introduction • Applications
• as primary connector • as part of a connection system • as reinforcement
• Performance/Design(Guidance)
Connection Design
Material: Douglas-fir (solid sawn) Dimensions: both members 8 x 8 (7.5 x 7.5) Screws: (6) 8.5 x 215mm HECO TOPIX-CC
8.0
22
Connection Design
Material: Douglas-fir (solid sawn) Dimensions: both members 8 x 8 (7.5 x 7.5) Screws: (6) 8.5 x 215mm HECO TOPIX-CC
8.0
22
12/10/2013
39
78
Connection Design
Material: Douglas-fir (solid sawn) density 0.49 !!! Dimensions: both members 8 x 8 (7.5 x 7.5) Screws: (6) 8.5 x 215mm HECO TOPIX-CC head-size ~ 9mm diameter d 8mm lef 215mm – 5mm = 210mm fax,k 12.5 N/mm2 12.5 Mpa ftens,k 18.0 kN nef 6 (why?)
α 45° (why?)
ρa 350 kg/m3
79
ρk = 1000 * ρk,0% * (1+M/100)
ρk = ([G *1000] * 0.84)* (1+M/100)
Source: Wood Handbook
Gehloff Consulting Inc.
Connection Design
Material: Douglas-fir (solid sawn) density ρk ~ 460 kg/m3 Dimensions: both members 8 x 8 (7.5 x 7.5) Screws: (6) 8.5 x 215mm HECO TOPIX-CC head-size ~ 5mm diameter d 8mm lef 215mm - 5mm = 210mm fax,k 12.5 N/mm2 12.5 Mpa ftens,k 18.0 kN nef 6 (why?)
α 45° (why?)
ρa 350 kg/m3
12/10/2013
41
82
This concludes the:

View more