06 design workshop 2017 - adhesive anchors jab final...5/17/2017 36 see mndot standard figure...
TRANSCRIPT
![Page 1: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/1.jpg)
Adhesive Anchorages
Joe Black | Structural Wall Engineer
May 17, 2017
Bridge Office | mndot.gov/bridge
![Page 2: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/2.jpg)
History
Bridge Office | mndot.gov/bridge5/17/2017
![Page 3: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/3.jpg)
Important Events
• Boston Big Dig Failure ‐ 2006
• Creep, short anchors, improper mixing, etc.
• Initial updates to ACI (2011) and ICC (2006)
• Manufacture change from ASD to LRFD
• MnDOT response 2006 – Present
• No anchors in sustained tension
• Investigated metal railing
• Updated design practices (ACI 318 and AC308)
• Changed Special Provisions5/17/2017 3Bridge Office | mndot.gov/bridge
![Page 4: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/4.jpg)
No Anchors in Sustained Tension
• MnDOT issued the following guidance in September of 2007:
“Effective immediately, MnDOT is prohibiting the use of adhesive anchors in all sustained tensile‐load applications…”
• Simply put “DON’T DO IT!”
• Use undercut anchors if needed
5/17/2017 4Bridge Office | mndot.gov/bridge
![Page 5: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/5.jpg)
Undercut Anchors
5/17/2017 5Bridge Office | mndot.gov/bridge
![Page 6: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/6.jpg)
T‐1 Rail Investigation
Bridge Office | mndot.gov/bridge5/17/2017
![Page 7: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/7.jpg)
A Semi Hits a Bridge Metal Rail…
5/17/2017 7Bridge Office | mndot.gov/bridge
![Page 8: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/8.jpg)
And MnDOT Responded…
• 48 bridges tested based on design speed
• Of the 48 bridges tested:
• 2 bridges found with no defects
• 11 bridges found with short anchors but no bond issues
• 11 bridges found with bond issues and no short anchors
• 24 bridges had issues with both length and bond
• Installation deficiencies were the primary cause
5/17/2017 8Bridge Office | mndot.gov/bridge
![Page 9: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/9.jpg)
Design
Bridge Office | mndot.gov/bridge5/17/2017
![Page 10: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/10.jpg)
MnDOT Utilized Design Codes
• AASHTO LRFD Bridge Design Specifications
• ACI 318
• AC308 (ICC‐ES)
5/17/2017 10Bridge Office | mndot.gov/bridge
![Page 11: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/11.jpg)
AASHTO LRFD Bridge Design Specification
• Currently silent on the subject
• Will add language in next edition which:
• Defers to ACI 318
• Waves the exclusion of impact loads per ACI 318 17.1.4
5/17/2017 11Bridge Office | mndot.gov/bridge
![Page 12: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/12.jpg)
AC308
• Published by ICC
• Most immediate response to Big Dig Disaster
• Currently defers to ACI 318 with some minor modifications
• Frequent updates
5/17/2017 12Bridge Office | mndot.gov/bridge
![Page 13: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/13.jpg)
ACI 318
• First added adhesive anchors to Appendix D in 2011 code
• Incorporated anchors into Chapter 17 of the current design code (ACI 318‐14)
• ACI 318‐11 Appendix D resistance factors used by MnDOT in design
• Splitting failure not dealt with directly
5/17/2017 13Bridge Office | mndot.gov/bridge
![Page 14: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/14.jpg)
7 Modes of Anchor Failure
• Steel rupture in tension
• Steel shear
• Concrete breakout in tension
• Concrete breakout in shear
• Splitting
• Bond failure
• Pryout failure
5/17/2017 14Bridge Office | mndot.gov/bridge
![Page 15: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/15.jpg)
Steel Failure Modes
• For steel tension check, use AASHTO 6.13.2.11
• For steel shear check, use AASHTO 6.13.2.7
• Account for interaction effects as per AASHTO• If the shear loads exceeds 33% of shear resistance, modify the tension in accordance with AASHTO Eq 6.13.2.11‐2
5/17/2017 15Bridge Office | mndot.gov/bridge
![Page 16: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/16.jpg)
Concrete Breakout in Tension
• Calculate resistance in accordance with ACI 318 17.4.2
• Assume concrete is cracked for this failure mode
• Take care when assuming breakout is restrained by reinforcing
5/17/2017 16Bridge Office | mndot.gov/bridge
![Page 17: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/17.jpg)
Concrete Breakout in Shear
• Calculate resistance in an accordance with ACI 318 17.5.2
• Assume concrete is cracked for this failure mode
• Take care when assuming breakout is restrained by reinforcing
5/17/2017 17Bridge Office | mndot.gov/bridge
![Page 18: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/18.jpg)
Splitting Failure
• Modification factors to account for splitting effects (cp,N and cp,Na) are found in ACI 318 17.4.2.7 and 17.4.5.5 respectively
• A description of the reason for these modification factors is found in ACI 318 R17.4.2.7
• ACI equations “are based on the assumption that the basic concrete breakout strength can be achieved if the minimum edge distance equals [the critical edge distance]”. However, certain anchor types “may” not achieve the basic tension capacity if a minimum edge distance equal to the critical edge distance is not provided.
5/17/2017 18Bridge Office | mndot.gov/bridge
![Page 19: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/19.jpg)
Splitting Failure
5/17/2017 19
X‐Section Plan View
Bridge Office | mndot.gov/bridge
![Page 20: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/20.jpg)
AC308 vs ACI 318
• Equations presented in ACI may be overly conservative
• The depth of the member and the presence of reinforcing reduce the likelihood that concrete splitting may occur
• To account for the effect that the member depth has on the capacity, use AC308 4.2.2 to calculate the critical edge distance, cac
5/17/2017 20Bridge Office | mndot.gov/bridge
![Page 21: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/21.jpg)
Bond Failure
• Calculate bond strength using ACI 318 17.4.5
• Consider carefully condition of bond to concrete (cracked or uncracked)
• When in doubt, consider as a cracked condition
5/17/2017 21Bridge Office | mndot.gov/bridge
![Page 22: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/22.jpg)
Cracking Assumption with Adhesives
• Uncracked bond strength (uncr) vs cracked bond strength (cr)
5/17/2017 22Bridge Office | mndot.gov/bridge
![Page 23: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/23.jpg)
Bond Failure
• MnDOT uses values different then those found in ACI 318 Table 17.4.5.2
• Characteristic Bond Strength for Threaded Rod Applications:
• uncr = 1000 psi and cr = 500 psi, or
• uncr = 1500 psi and cr = 750 psi
• Characteristic Bond Strength for Reinforcing Bar Applications:
• uncr = 1000 psi and cr = 500 psi
5/17/2017 23Bridge Office | mndot.gov/bridge
![Page 24: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/24.jpg)
Pryout Failure
• Calculate resistance using ACI 318 17.5.3
• Pryout is a shear failure mode which is estimated using tensile failure values
• Always consider pryout when shear is a valid load case
5/17/2017 24Bridge Office | mndot.gov/bridge
![Page 25: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/25.jpg)
Resistance Factors
Bridge Office | mndot.gov/bridge5/17/2017
![Page 26: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/26.jpg)
Anchor Category
• Anchor Category – Defined as the systems sensitivity to installation and overall reliability
• Category 1 = Low sensitivity to installation and high reliability
• Category 2 = Moderate sensitivity to installation and moderate reliability
• Category 3 = High sensitivity to installation and low reliability
5/17/2017 26Bridge Office | mndot.gov/bridge
![Page 27: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/27.jpg)
Resistance Factors
• Use ACI 318‐11 Appendix D.4.3 and D.4.4
• Apply Category 1 resistance factors for concrete breakout in tension
• Apply Category 2 resistance factors for bond failure mode
5/17/2017 27Bridge Office | mndot.gov/bridge
![Page 28: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/28.jpg)
Concrete Condition
• Anchor Condition – Defined by the presence or absence of supplementary reinforcing.
• Condition A = Concrete with supplementary reinforcement
• Condition B = Concrete without supplementary reinforcement
• Any regularly reinforced section with appropriate temperature and shrinkage steel and/or distribution steel may be considered Condition A.
• Always use Condition B for pryout strength
5/17/2017 28Bridge Office | mndot.gov/bridge
![Page 29: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/29.jpg)
Resistance Factor for Pryout
• a∙Nag is calculated using ACI 318 17.4.5
• c∙Ncbg is calculated using ACI 318 17.4.2
• Vcp is calculated using ACI 318 17.5.3
• When a∙Nag > c∙Ncg then use Ncbg to calculate Vcp and use cas the resistance factor for pryout
• Otherwise use Nag to calculate Vcp and use a as the resistance factor for pryout
5/17/2017 29Bridge Office | mndot.gov/bridge
![Page 30: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/30.jpg)
D.4.3
5/17/2017 30Bridge Office | mndot.gov/bridge
![Page 31: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/31.jpg)
D.4.3
5/17/2017 31Bridge Office | mndot.gov/bridge
Apply to Ncg
Apply to Nag
a∙Nag > c∙Ncg
Apply to Vcp
a∙Nag < c∙Ncg
Apply to Vcp
![Page 32: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/32.jpg)
Extreme Event
• Set all resistance factors to 1.0 for Extreme Event loading
5/17/2017 32Bridge Office | mndot.gov/bridge
![Page 33: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/33.jpg)
Interaction Effects
• Apply ACI 318 17.6 when considering combined tension and shear.
• Do not consider steel failure modes using ACI 318 interaction because it is already considered in AASHTO equations
5/17/2017 33Bridge Office | mndot.gov/bridge
![Page 34: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/34.jpg)
Interaction Effects
5/17/2017 34Bridge Office | mndot.gov/bridge
![Page 35: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/35.jpg)
Plans and Special Provisions
Bridge Office | mndot.gov/bridge5/17/2017
![Page 36: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/36.jpg)
Standard Plan Note
5/17/2017 36
See MnDOT Standard Figure 5‐397.162 for actual note
Bridge Office | mndot.gov/bridge
![Page 37: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/37.jpg)
Standard Plan Note
• Similar note is to be included in all plans containing adhesive anchors
• Some important questions to ask:
• What diameter of bar or rebar mark is the anchor?
• What is the required uncracked concrete bond strength to meet design parameters?
• What is the required effective embedment?
• If encountered, should workers drill through reinforcing?
• WHAT IS MY REQUIRED PROOF LOAD?
5/17/2017 37Bridge Office | mndot.gov/bridge
![Page 38: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/38.jpg)
Proof Load
• When proof loading an anchor, edge effects may be reduced and group effects are not considered
5/17/2017 38
• Set to the minimum of:
• The factored nominal concrete breakout of a single anchor (c∙Ncb)
• The factored nominal bond strength of a single anchor (a∙Na)
• 80% of the yield of the anchor dowel or rod
Bridge Office | mndot.gov/bridge
![Page 39: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/39.jpg)
Special Provisions
• “Adhesive anchorage installers must hold current ACI‐CRSI Adhesive Anchor Installer Certification credentials. Installers are required to check depth, diameter and condition of the drilled hole, clean the hole, and install the anchorage per the Manufacturer’s Printed Installation Instructions (MPII).”
• I.E., the installer should know what he/she is doing
5/17/2017 39
See ‘SB2016‐2402.6WP’ entitled ‘Metal Railing ("Duplex Coated" using Hot‐dipped Galvanizing and Paint Coating)’ for all changes
Bridge Office | mndot.gov/bridge
![Page 40: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/40.jpg)
Installation Proof Testing METHOD 1
• Prior to installation, 5 anchors are tested to the proof load given in the plans to verify installation procedure
• 10% (no less than 10) of the anchors are tested after installation to verify installation
• Additional anchorages tested per each failure
• No more than 5% concrete breakout failures permitted
• Concrete breakout failure is defined in the special provision
5/17/2017 40
See ‘SB2016‐2402.6WP’ entitled ‘Metal Railing ("Duplex Coated" using Hot‐dipped Galvanizing and Paint Coating)’ for all changes
Bridge Office | mndot.gov/bridge
![Page 41: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/41.jpg)
Installation Proof Testing METHOD 2
• No testing of system prior to installation
• 10% plus 5 (no less than 15) of the anchors are tested after installation to verify installation
• Additional anchorages tested per each failure
• No more than 5% concrete breakout failure permitted
• Concrete breakout failure is defined in the special provision
• Ultrasonic Testing required on all tested anchors and an additional 5% (no less than 3) to verify embedment
5/17/2017 41Bridge Office | mndot.gov/bridge
![Page 42: 06 Design Workshop 2017 - Adhesive Anchors JAB FINAL...5/17/2017 36 See MnDOT Standard Figure 5‐397.162 for actual note Bridge Office | mndot.gov/bridge. Standard Plan Note ... Microsoft](https://reader033.vdocuments.net/reader033/viewer/2022050305/5f6dd4b8caf39f63d15888ae/html5/thumbnails/42.jpg)
Special Provisions
• The number of anchorages tested for each method is provided by the designer.
• New Approved Products List generated as part of release
• Similar changes will be made to all adhesive anchorage applications, including rebar dowel applications
5/17/2017 42
See ‘SB2016‐2402.6WP’ entitled ‘Metal Railing ("Duplex Coated" using Hot‐dipped Galvanizing and Paint Coating)’ for all changes
Bridge Office | mndot.gov/bridge