Aefac Design of fasteners PDF
| Title | Aefac Design of fasteners |
|---|---|
| Course | Structural Theory and Design 3 |
| Institution | University of Melbourne |
| Pages | 31 |
| File Size | 3.9 MB |
| File Type | |
| Total Downloads | 90 |
| Total Views | 142 |
Summary
AEFAC Design of fasteners...
Description
University of Melbourne
Outline
Design of Fastener asteners s According to AS 5216 Tilak Pokharel, PhD (Melb) AEFAC National Technical Manager [email protected]
24 September 2019 ʹ
What is AEFAC? AEFAC FOUNDING BOARD MEMBERS
USTRALIAN NGINEERED G R D OR ASTENER R & NCH NCHOR ORSS CI OUNCI CILL C OUN AEFAC SUPPORTING MEMBERS
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
Ͷ
What does AEFAC Do? • ͳͲͳǣʹͲͳͷ • ͷʹͳǣʹͲͳͺ • ȋǤǤǤȀ ǤȌ •
Guidelines for the specification of anchors
Training & certification for installers of anchors
For Designers
For Contractors
ȋǤǤǤȀ ǤȌ
Minimum performance & standard specification
Guideline for field testing & certification of anchors
For Manufacturers
For Field Engineers
Introduction to Anchors
ȋǤǤǤȀǤȌ •
• • • •
Research & Development For anchor industry
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
ͷ
Why do we need anchors? Ǧ Ǧ Ǧ CONNECTIONS Ǧ Ǧ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ͺ
Applications
What Can Go Wrong with Anchors? Nonstructural
• Facades • Suspended ceilings • Heating & ventilation • Pipelines • Mechanical equip. • Etc.
Structural • Structural connections • Strengthening
Eligehausen (University of Stuttgart)
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
ͻ
What Can Go Wrong with Anchors??
Source: ǣ ǡ ǡǤǤͲʹǣͲͳͷǡʹͻ ʹͲͲʹ
Source: ǣ Ƭǡ ǡǤǤͲͷǣͲͲͶǡͳʹͲͲͷ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ͳͲ
What Can Go Wrong with Anchors? Boston Big Dig Tunnel, 2006
Boston Big Dig Tunnel, 2006
Photograph taken following incident showing roof hangers pulled away from tunnel roof.
Source: NTSB (2007) Highway Accident Report, “Ceiling collapse in the Interstate 90 Connector Tunnel, Boston, Massachusetts, July 10, 2006”
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
ͳͳ
Source: Brady, S., “Interstate 90 Connector Tunnel ceiling collapse” The Structural Engineer, April 2013
Typical chemical anchor and roof hanger plate assembly.
Three of the 20 failed anchors taken from the site of the incident illustrating defects.
Source: NTSB (2007) Highway Accident Report, “Ceiling collapse in the Interstate 90 Connector Tunnel, Boston, Massachusetts, July 10, 2006”
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ͳʹ
Thr Three ee critical ele elements ments to achie achieve ve quali quality ty assurance in anc anchor hor hors s
Fastening for safety-critical applications • ǡȀ Ǥ • ǮǦ ǯ Ǥ ǦǤ
Prequalification
Design
Installation
Products independently tested & assessed to be “fit for purpose”
Rigorous assessment to design for critical mode of failure
Informed and competent installer with appropriate supervision and experience
ͳͶ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
ͳ͵
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ͳͶ
Types of Anchors
Anchor Types, Application & Sensitivity
Pros: Ǧ
Pros: Ǧ
Cons: Ǧ
Cons: Ǧ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ͳ
Cast in Place anchors
Cast in Place anchors ͳ
ͳͺ
Cast in Place anchors
Cast in Place anchors ͳͻ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ʹͲ
Cast in Place anchors
Post Installed anchors Cons
Pros
Post-Installed Anchors
• • • • Ǧ
• • ȋȌ •
Mechanical Anchors
Undercut Anchors
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
ʹͳ
Types of Post Installed Anchors
Chemical Anchors
Expansion Anchors
Injection type Anchors
Capsule Anchors
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ʹʹ
Mechanical Anchors
Mechanical Anchors
Undercut
Undercut Anchors Undercut
Self-undercut
Expansion Anchors
Screw
Reverse Undercut
Note: Very sensitive to drill hole diameter!
Forward Undercut
Screw
Displacement Controlled
Torque Controlled
Source:BS8539
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
ʹ͵
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ʹͶ
Mechanical Anchors
Mechanical Anchors ʹͷ
ʹ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
Mechanical Anchors Mechanical Anchors Mechanics • Ȁ • ǡǡ Ǥ • • Ǥ Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melb
Drill Ǧ Ǧ
Clean Ǧ Ǧ Ǧ
Torque
Insert Ǧ
Ǧ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ʹͺ
Mechanical Anchors
Mechanical Anchors
Cons
Pros
• • • •
Expansion forces generated during anchor installation result in high stresses and localised deformations in the concrete (Eligehausen et al, 2006). Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
ʹͻ
Types of Post Installed Anchors
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
Injectable
Note: Hole cleanliness very important!
͵Ͳ
Types of Chemical Anchors
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
• Ȁȋ Ȃ Ȍ • •
Capsule
Ǥ
Source:BS8539 ͵ͳ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
͵ʹ
Chemical Anchors - Composition
Chemical Anchors - Applications
Chemical Anchors
Hybrid, Vinylester, Epoxy Acrylate, Methacrylate
Unsaturated Polyester
Epoxy
Increasing shelf life* Increasing cost* Increasing curing time* *Note: this may change as products develop Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
͵͵
Chemical Anchors - Applications
͵Ͷ
Chemical Anchors - Applications
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
͵ͷ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
͵
Chemical Anchors
Chemical Anchors
• ǫ • Ƭ ȋ Ȍ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
• • ʹͺ •
͵
Chemical Anchors - Curing
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
͵ͺ
Chemical Anchors - Curing EXAMPLE ONLY – product specific
Curing process = Resin + hardener Chemical process -> Release heat Gel time/working time/open time / nozzle life = time taken from first mixing until chemical is no longer “flowing”, becomes a gel
Curing time = time taken from first mixing until chemical becomes completely hardened i.e. achieves full strength
Base Material
Maximum working
Minimum curing time in dry
Minimum curing time in wet
temperature
time
concrete
concrete
°C
(minutes)
(hours)
(hours)
+5°C to +9°C
60 min
72h
144h
+10°C to +19°C
45min
36h
72h
+20°C to +29°C
30 min
10h
20h
+30°C to +39°C
20 min
6h
12h
40°C+
12 min
4h
8h
Wet conditions, curing time increases!
Temperature, Curing rate
Curing rate = temperature dependent Higher temperature = shorter curing time
Rule of thumb, increase temperature by 10°C ~ double reaction rate
Temperature too low, reaction may become dormant, chemical not properly cured → premature failure of anchor! Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
͵ͻ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ͶͲ
Chemical Anchors - Bonding
Chemical Anchors – Importance of hole cleanliness Drill dust will prevent proper bonding -> Strength reduction!
Dzdz
Ǧ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
Ͷͳ
Drill dust will prevent proper bonding -> Strength reduction!
Bond Strength, %
Ǧ
100
Clean, full brush
ͳȂ ʹǡ ʹǡ ʹ
80 60
ʹȂ ͳǡ ͳ ͳ
40
Ͷʹ
Chemical Anchors – Cleaning equipment
Chemical Anchors – Sensitivity to cleaning method
120
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
Provide natural resistance when inserted into hole
Clean, oil free air
20
͵Ȃ ʹ 0 1
2 3 Method of Hole Cleaning
4
ͶȂ ȋ ͵Ȍ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
Ͷ͵
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ͶͶ
Chemical Anchors – Injection equipment
Chemical Anchors – mixing nozzle
Waste initial material Overhead installation
Do not modify in any way!
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
Do not mix and match mixing nozzle from other manufacturer Ͷͷ
Ͷ
Chemical Anchors – Voids in injection
Installation of Injectable Chemical Anchor
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
Ͷ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
Ͷͺ
Chemical Anchors – Alignment
Chemical Anchors (Capsules)
• άͷι
• Ȃ ȋ Ƭ ǨȌ • ǡ Ǥ
• ͷι
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
Ͷͻ
Chemical Anchors (Capsules)
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ͷͲ
Chemical Anchors (Capsules) • ȋȂ Ȍ
• ʹȂ DzdzDzdz • Dzdz Dzdz • • Ǧ Ǩ
Check that resin is “flowing” before use ͷͳ
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ͷʹ
Chemical Anchors
Installation of Capsule Chemical Anchor
Cons
Pros
• • • ǡ
• • • •
Note: Minus tolerances not allowed for edge distance / anchor spacing Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
ͷ͵
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁwww.aefac.org.au
ͷͶ
Chemical Anchors (Masonry) • Ǥ
Design to AS 5216:2018
•
Dr. Tilak Pokharel ȁȁ Design of Fasteners According to AS 5216 ȁȁ The University of Melbourne ȁȁ www.aefac.org.au
ͷͷ
ͷ
Regula egulatio tio tions ns SA TS 101—2015 “DESIGN OF POST-INSTALLED AND CAST-IN FASTENINGS FOR USE IN
• AS 5216:2018 • Primary reference in NCC 2019
CONCRETE”
• NCC Volume One – Clause B1.4(b)(iii) • NCC Volume Two – Clause 3.0.4(e) The NCC is given legal effect by relevant legislation in each State and Territory. This legislation prescribes or "calls up" the NCC to fulfil any technical requirements that are required to be satisfied when undertaking building work or plumbing and drainage installatio...
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