RESEARCH COUNCIL ON STRUCTURAL CONNECTIONS SPECIFICATIONS COMMITTEE

Task Group 1 Meeting Agenda

Date: Thursday June 8, 2017

Location: TBD

Time: 7:30 am – 9:00am CDT

1. Introduction

1.1. Introduction of members

1.2. Adoption of agenda

1.3. Brief Discussion of Scope and Charge of Task Group 1

2. Discussion of Open Work Items (Attachment A):

2.1. TG1-2016-005 – Old Spec Committee item S12-046 – Definition of Torque (Victor Shneur)

(Attachment B)

Current status. Shneur (Rassati/Curven to help) to present draft proposal

2.2. TG1-2016-002 – Blended RCSC Specification Draft for XTB bolts (Bob Shaw) (Attachments C

and D)

Current status: RCSC item S14-060. Larson and Shaw to present draft proposal.

2.3. TG1-2016-001 – Replacement of “Tension Calibrator” in glossary (Bob Shaw) (Attachment E)

Current status: Incorporated in TG1-2016-002

2.4. TG1-2016-003 – Terminology discussion: “fastener assembly or component” vs. “bolting

assembly and component” and relative definitions (Bob Shaw) (Attachment F)

Current status: Incorporated in TG1-2016-002

2.5. TG1-2016-004 – Terminology: distinguish between “bolting assembly” and “matched bolting

assembly” (Bob Shaw) (Attachment G)

Current status: Incorporated in TG1-2016-002

2.6. TG1-2016-008 – Incorporation of F3125 throughout (Carter, but really Larson)

Current status: Spec Committee item S16-078 – Incorporated in TG1-2016-002

2.7. TG1-2016-006 – Discussion on introduction of A, B, C, D groups consistently with AISC

(Charlie Carter)

Current status: Discussion needed – Incorporated in TG1-2016-002?

2.8. TG1-2017-001 – Item S17-082 – Alternative fasteners (Chad Larson) (Attachment H)

Current status: new proposal being considered by Exec.

2.9. TG1-2017-002 – Editorial C-2.2 (Shaw) (Attachment I)

Current status: proposal to SC to suggest treating change as editorial ready to be submitted

2.10. TG1-2016-007 – Incorporation of F2482 – Load indicating Ext. Threaded Fasteners (Carter)

Current status: Discussion needed. Next ballot?

3. New business

Attachment A

TG1 Meeting – June 2016 2

Jun-16 May-17 Jun-17 Dec-17 Jun-18 Dec-18

TG1-2016-001 Glossary Replacement of "tens ion ca l ibrator in glossary". Emai l

from Bob Shaw on 2/26/16. Attachment B. Tens ion

measuring device i s used in F3125 and F 1852 section

14. DTIs are tens ion indicating devices (not

measuring). RCSC Glossary should conta in tens ion-

measuring as opposed to tens ion-indicating device

under Tens ion Cal ibrator to avoid confl ict with DTIs

Open. Item

discussed at June

meeting. Further

discuss ion needed

to prepare a

proposal .

Open. Proposal wi l l

be incorporated in

16-002

TG1-2016-002 Various Blended RCSC Speci fication Draft for XTB bolts . Draft

6/9/15 and 7/23/14 included in Bob Shaw's emai ls from

2/29/2016. (Attachments C and D)

Open. Brief

discuss ion at June

meeting. More

discuss ion needed

Open. Larson and

Shaw to prepare

blended proposal

including 16-002,16-

003,16-004,16-008

to be bal loted

i tem by i tem

TG1-2016-003 Various Terminology. Bob Shaw's emai l from 3/23/16.

Attachment E. Change "fastener assembly" to "bolting

assembly" and "fastener component" to "bolting

component", and add a defini tion for "bolting

component". Due to change in A962 for 2016 from

committee A01, changing "fastener" to "bolting

materia l" and "bolting components"

Open. Bob Shaw

made some

suggestions

(Attachment E).

More discuss ion

needed to prepare

a proposal

Open. Proposal wi l l

be incorporated in

16-002

TG1-2016-004 Various Terminology. Bob Shaw's emai l from 3/23/16.

Attachment F. The use of fastener assembly i s

incons is tent through RCSC. Proposed to dis tinguish

between "bolting assembly" and "matched bolting

assembly"

Open. Bob Shaw

made some

suggestions

(Attachment F).

More discuss ion

needed to prepare

a proposal

Open. Proposal wi l l

be incorporated in

16-002

TG1-2016-005 Glossary Old i tem S12-046 - Defini tion of Torque. (Attachment G) Open. Prepare a

proposal for next

meeting

Open. Shneur

(Rassati+Curven) to

prepare a proposal

TG1-2016-006 Various Carter. Introduce A,B,C (XTB),D (TnA) groups cons is tently

with AISC

Tabled. Unti l other

i tems are resolved

Tabled. Unti l other

i tems are resolved.

Might be included

in 16-002

TG1-2016-007 Various Carter: Incorporate F2482 - Load Indicating External ly

Threaded Fasteners?

Open. No progress Open. No progress .

Discuss at meeting

TG1-2016-008 Various Carter: Incorporate F3125 (including 120 and 150 ks i

bolts ) throughout

Open. More

discuss ion

needed.

Open. Proposal wi l l

be incorporated in

16-002

TG1-2017-001 2.8 Larson: Al ternative fasteners Waiting for Exec

input. Be ready to

prepare proposal

TG1-2017-002 2 Shaw: editoria l on figure C-2.2 for compatibi l i ty with

table C-2.1

Open. GAR to

prepare proposal

Work item Section DescriptionTG Work Items

Attachment B

TG1 Meeting – June 2016 3

RCSC Proposed Change: S12-046 Name: Chris Curven E-mail: _chrisc@appliedbolting.com Phone: 802-460-3100 Fax:

Ballot History: 2014-15 Ballot

6 negatives (Byrne, Carter, Hajjar, Mahmoud, McGormley, Ocel)

6 affirmative w/ comment (Connor, Mayes, Rassati, Schlafly, Schroeder, Vertullo)

Proposed Change:

{The original proposal was sent to a task group at the 2012 Specification meeting. The task group

members are Chris Curven (chair), Victor Shneur, Curtis Mayes, Rich Brown and Pete Birkemoe. The

following is the proposal that has come back from the task group.}

Glossary

{All existing terms in Glossary remain unchanged.} Bolt Tension. The axial force resulting from elongation of a bolt.

Torque. The moment (turning force) that tends to rotate a nut or bolt.

2014-15 Ballot Responses

Negative Voters Garret Byrne For Bolt Tension, it does not seem necessary to include the word elongation as minor axial forces would not cause appreciable elongation. Also, any elongation that would occur would be a result of the force, not the other way around. If any definition is necessary, prefer "The tensile force occurring in a bolt". Torque. The force required to turn a nut or bolt about its centroid (central axis?). Charlie Carter I do not think we need to include dictionary-based definitions in the RCSC Specification. These can be looked up in any dictionary and repeating them in the RCSC Specification Glossary seems pointless. We already are clear about the differences between torque and tension. What's more, we really are talking about PRETENSION, not tension, in the suggested definition! Jerome Hajjar I would recommend changing "tends to rotate" to "rotates". Hussam Mahmoud A perhaps more technically sound definition for "Torque" that can be used is: Torque: The turning force which causes a moment that tends to rotate a nut or bolt. RCSC Proposed Change S12-046

Attachment B

TG1 Meeting – June 2016 4

Jonathan McGormley Suggested language change: Bolt Tension: the axial force resulting from elongation of a bolt "from tightening" Torque: the moment (turning force) that tends to rotate a nut or bolt "relative to each other". Justin Ocel I think you need to say the force is in the bolt. Suggest "The internal axial force of a bolt resulting from its elongation" or "the axial force within the bolt from its elongation"

Affirmative Comments Robert Connor While I don't have a better wording in mind, it seems we can possibly improve the definition for "Tension". However, I am not opposed to the present version. Curtis Mayes The "S12-046 Glossary - Torque.docx" file received has what I would call "notes" starting with "{Original proposal in 2012}" and ending with "...clamping in a bolted connection". The proximity of these "notes" make it appear that the notes are an ambiguous part of the new Glossary, which is not the intention. My vote is affirmative based on the assumption that the proposed change only includes, Bolt Tension. The axial force resulting from elongation of a bolt. Torque. The moment (turning force) that tends to rotate a nut or bolt. Gian Andrea Rassati However, I really don't like the "turning force" expression in parenthesis. I understand why it's there, but it perpetuates the confusion between moments and forces. Tom Schlafly Did we check to see that all uses of these terms in the spec comply with these new definitions? I expect they do. Consider adding units such as 'usually measured in pounds or kips" and usually measured in kip-in or kip-ft" Gerald Schroeder Affirmative with comment. In the definition of tension, it appears to me that the word force should be included after "a clamping". As it is written, a clamping (what). Carmen Vertullo Can't we just say "force times distance" in there somewhere?

{Original proposal in 2012}

Glossary {All existing terms in Glossary remain unchanged.}

Torque (noun). 1. The moment of a force; the measure of a force's tendency to produce torsion and

rotation about an axis, equal to the vector product of the radius vector from the axis of rotation to the

point of application of the force and the force vector.

2. A turning or twisting force.

(Both copied from The Free Dictionary by Farlex)

3. A rotational moment; it is a measure of how much twisting is applied to a fastener.

(Copied from boltscience.com)

Torque (verb). to impart a twisting force. (copied from The Free Dictionary by Farlex)

Tension. A bolt resistance to elongation that provides a clamping in a bolted connection. RCSC

Proposed Change S12-046

Attachment B

TG1 Meeting – June 2016 5

Rationale or Justification for Change:

Torque and tension are the two basic terms used in structural bolting with the term torque being used

predominantly. However, in the field and in offices, their definitions and physical differences are not

understood. The users of this specification would be well served if we provide them with a definition.

Most recent proposal:

Bolt Tension Definition BT25: The axial force within a bolt resulting from its elongation. Bolt

tension is usually measured in kips.

Torque Definition T25: The turning force that tends to rotate a nut or bolt. Torque can be

measured in foot-pounds.

Attachment C

TG1 Meeting – June 2016 6

From: Bob Shaw - SSTC To: Rassati, Gian Andrea (rassatga) Subject: XTB draft for RCSC next edition Date: Monday, February 29, 2016 2:34:36 PM Attachments: 201X RCSC Specification draft 2-15-06-08 additions for Extra High Strength Bolt Assemblies.pdf 201X RCSC Specification draft 2-15-06-08 additions for Extra High Strength Bolt Assemblies.docx

GA,

Since you said you had a conference call scheduled for later this week, I thought I better get this

to you ASAP.

This is the draft that was submitted to Exec at Montreal. There may be a few editorial tweaks

needed based upon some editorial items in the ASTMs, but that can come later. I think the

technical content for what you need for your chapters is there.

As a side note, I’ve had some conversations with Chad Larson about the inclusion of the TNA

assembly, which has an ASTM (F3128), also undergoing some revision on installation. We have

been discussing a “combined method” of installation to be added to Chapter 8, either generic, or

listing the specific requirements of F3043, F311 and his F3128. We haven’t had a follow-up call

to discuss draft language of the generic type yet, nor language that might add F3128 directly.

The use of Extra-high strength in the title and text is something that could be alleviated by

adopting Group A, B and C designations as used in AISC, but RCSC had resisted that in prior

meetings. Maybe it is time to revisit that. F3128 is not in AISC, so the issue is where that would

fit in the new spec (a Group D?) as it has A490 type pretensions but 144 ksi based shear values.

Chad is also thinking that the load indicating bolt people may want added to the RCSC Spec.

They have ASTM F2482 (fairly generic).

Bob

The document will be shared with TG1 members.

Attachment D

TG1 Meeting – June 2016 7

From: Bob Shaw - SSTC To: Rassati, Gian Andrea (rassatga) Subject: 140723_2014 RCSC Specification-XTB Blended Date: Monday, February 29, 2016 3:12:29 PM Attachments: 140723_2014 RCSC Specification-XTB Blended.docx

In case anybody gets worked up about the proposed new title, this is the draft prepared by Allen

Harrold for me, when the Exec decided in Estes Park that they wanted a blended spec, not a

separate spec. I used his glossary term “extra …” for the title instead of the specific ASTM

designations.

Bob

The document will be shared with TG1 members

Attachment E

TG1 Meeting – June 2016 8

From: Bob Shaw - SSTC To: Rassati, Gian Andrea (rassatga) Cc: Heath Mitchell; John O"Brien Subject: RCSC Proposed replacement of glossary term "tension calibrator" Date: Friday, February 26, 2016 1:56:50 PM

As I was studying the finer points of the new ASTM F3125 (while updating the Structural Bolting

Handbook), it caught my attention that it uses the term “tension measuring device.” We use the

same term in ASTM F1852 in section 14, and likely elsewhere.

As to RCSC, we’re not really calibrating bolt tension, rather we are measuring bolt tension. In

calibrated wrench, we calibrate the wrench, not the bolt.

I recommend we replace the term “tension calibrator” with “tension measuring device” as used in

ASTM.

I doubt that Skidmore-Wilhelm/Tungsten Capital would object, but they currently use the term for

their product(s). Their website lists their products in a section called “Bolt Testers”.

The DTI folks may object, as they may claim that their product does this. Commentary to 8.2.4

leads with “ASTM F959 direct tension indicators are recognized in this Specification as

a bolt-tension-indicating device.” It states “indicating” as opposed to “measuring,” so I think we

are OK. A quick word search for “measuring” shows little use of the term, and no conflicts.

If anything, we should change the RCSC glossary definition to “tension measuring device” from

“tension-indicating device,” just to avoid conflict with DTI terminology.

Under the new system with TGs in RCSC Spec, I have no idea what formalities are involved. I

admit my confusion when ballots were emailed out without (I assume) review and discussion by

the TGs.

For reference, the info below may be of convenience:

RCSC (glossary, chapter 7)

Tension Calibrator. A calibrated tension-indicating device that is used to verify the acceptability

of the pretensioning method when a pretensioned joint or slip-critical joint is specified.

ASTM 3125 (section 11, Annex A2)

“tension measuring device”

Skidmore-Wilhelm

Model MZ Bolt Tension Calibrator

Attachment F

TG1 Meeting – June 2016 9

From: Bob Shaw - SSTC To: Rassati, Gian Andrea (rassatga) Cc: Tom Schlafly; Chad Larson; "Larry Kruth - Douglas Steel" Subject: RCSC terminology (as well as in AISC and ASTM) Date: Wednesday, March 23, 2016 5:12:36 PM

GA,

A recent ballot in A01 got me thinking about bolting terminology, which I still assume is under

your domain at RCSC.

There was a recent addition to ASTM A962, for 2016. The A01 folks are in the process of

replacing the term “fastener” in their bolting standards to use “bolting materials” and “bolting

components” as used in A962 section 1.3 below.

1.3 Fasteners are a wide-ranging classification that includes screws, bolts, nuts, washers, stud bolts, rivets, powder-actuated studs, staples, tacks, and pins. Bolting, which is composed of bolting materials, such as rods, bars, flats, and forgings, which are subsequently manufactured into bolting components, are a special sub-group of fasteners. Bolting materials and components have designated compositions and specific properties intended for applications in aggressive service where commercial generic fasteners may not be suitable or have insufficient fitness for purpose under certain conditions. These conditions include cryogenic or high temperature service, or excessive vibration, impact, or shock. To further address any other special service conditions where bolting is intended for use, additional requirements may be specified by mutual agreement between the purchaser and supplier.

RCSC uses the term

“Fastener Assembly. An assembly of fastener components that is supplied, tested and installed as a

unit.”

A text search of the current RCSC Spec shows “fastener assembly,” sometimes and

inconsistently shortened to only “fastener,” and “fastener component.” Of course, bolt, nut and

washer is used.

My suggestion is that we change “fastener assembly” to “bolting assembly” and “fastener

component” to “bolting component,” adding a definition for ”bolting component.”

Bolting Assembly. An assembly of bolting components that is supplied, tested and installed

as a unit.”

Bolting Component. Bolt, nut, washer, direct tension indicator or other element used as a

part of a bolting assembly.

Some background info:

ASTM F1789 contains the following definitions:

bolt-nut-washer assembly—a combination of bolt, nut, and washer components from singular lots that have been assembled, lubricated as necessary, tested as required, and prepared for shipment to a customer creating a unique set and certifiable lot.

Attachment F

TG1 Meeting – June 2016 10

mechanical fastener—mechanical device that holds or joins two or more components in definite positions with respect to each other and is often described as a bolt, nut, rivet, screw, washer, or special formed part.

ASTM F3125’s title states “bolts”, but contains assemblies, and sometimes uses “fastener

assembly” and sometimes “bolt assembly,” as an example: 11.1.1 The assembly lot tension test shall be performed on twist-off style fastener assemblies to determine the ability of the assembly to provide the required minimum tension. 11.1.2 Twist-Off style bolt assembly lots shall be tested by the manufacturer or responsible party to verify conformance to installation tension requirements.

The old twist-off standards used “bolt/nut/washer assemblies” in the title (and bolt-nut-washer

assemblies” in the text). Chad’s F3148 TnA144 uses “structural bolt assembly.”

AISC 360-16 glossary has Fastener. Generic term for bolts, rivets, or other connecting devices. High-strength bolt. Fastener in compliance with ASTM A325, A325M, A490, A490M, F1852, F2280 or an alternate fastener as permitted in Section J3.1. (I think this got a last-minute editorial revision to F3125, and could probably use a bit more re A354, F3043 and F3111, but likely too late)

In AISC 360-16, fastener is frequently used in design sections, as it applies to both bolts and

rivets, but sometimes bolt is used directly (such as for pretensions). M2.5 uses “bolt holes” but I

guess that would be “fastener holes” under the glossary. Chapter N uses “fastener,” fastener

components” and “fastener assemblies” as well as bolting terms.

Attachment G

TG1 Meeting – June 2016 11

From: Bob Shaw - SSTC To: Rassati, Gian Andrea (rassatga) Cc: Tom Schlafly; Chad Larson; "Larry Kruth - Douglas Steel" Subject: RE: RCSC terminology (as well as in AISC and ASTM) Date: Wednesday, March 23, 2016 7:02:54 PM

All,

So just to mess with this, I looked harder at the definition of “fastener assembly” as used in

RCSC, and then looked at how we use it there. Not consistent there. One could say the “fastener

assembly” is limited to a matched set, as it is “supplied, tested and installed as a unit.” But we

use the term when defining manufacturer, and that covers components. Look at 2.1 on

certifications. And we never test bolts and nuts as a unit if snug-tightened only. And the supply

of bolts, nuts, washers and DTIs can come from four orders and four sources.

So maybe bolting assembly should be Bolting Assembly. An assembly of bolting components

installed as a unit.”

And maybe “Matched Bolting Assembly” to be “Bolting Assembly supplied and tested by the

manufacturer or supplier as a unit.”

GA, have fun with this new work item!

Bob

Attachment H

RCSC Proposed Change

Name: _Chad Larson_______________ E-mail: _clarson@lejeunebolt.com_________

Phone: _952-843-5444______________ Fax: _________________________________

Proposed Change:

Change to section 2.8 on alternative-designs and related commentary. (see attached)

Rational or Justification for Change (attach additional pages as needed):

There are numerous cases where existing alternative-design language does not adequately address

the way industry uses alternative-designs. The existing language is largely from when this section

was intended to address Twist-off type bolts. Twist-off bolts have now been specifically

recognized by RCSC for three publication cycles.

The current language excludes alternative-designs other than those intended to replace A325 or

A490 (which no longer exist). This conflicts with industry usage of SmartHex twist off bolts,

which I consider to be alternate designs of F1852.

The current language does not address washers. This conflicts with industry use of Squirter

DTI’s, which I consider to be alternative-designs of F959. This also conflicts with industry usage

of lock washers such as Nordlock.

The current language does not address nuts. This conflicts with industry usage of flange nuts,

lock nuts and nuts with captive washers.

The current language assumes full pretension in each instance of alternative-design. This conflicts

with industry usage of alternative-designs in shear/bearing connections, such as the TNA

fastening system or certain blind bolting products.

The current language does not address coatings.

The current language does not address alternative-design requirements when considering different

strength levels.

Section 2.8 and related commentary are silent on the standing practice that fasteners and fastening

components must have an ASTM standard prior to consideration by this committee.

Commentary (attach additional pages as needed): See attached

------------------------------------For Committee Use Below-----------------------------------------------

Date Received: ______ Exec Com Meeting: _______ Forwarded: Yes □ /No □

Committee Assignment: Executive -A. □ Editorial -B. □ Nominating -C. □

Specifications -A.1 □ Research -A.2 □ Membership & Funding -A.3 □ Education -A.4 □

Committee Chair: ____________ Task Group #: ___________ T.G. Chair: ________________

Date Sent to Main Committee: _______________Final Disposition: ______________________

Attachment H

EXISTING WORDING Commentary:

It is the policy of the Research Council on Structural Connections to directly recognize

only those fastener components that are manufactured to meet the requirements in an

approved ASTM specification. Prior to this edition, the RCSC Specification provided for

the use of ASTM A325 and A490 bolts, and F1852 twist-off-type tension-control bolt

assemblies directly and alternative design fasteners meeting detailed requirements similar

to those in Section 2.8 when approved by the Engineer of Record.

With this edition, ASTM F2280 twist-off-type tension-control bolt assemblies are now

recognized directly. Essentially, ASTM F2280 relates an ASTM A490-equivalent

product to a specific method of installation that is suitable for use in all joint types as

described in Section 8. Provision has also been retained for approval by the Engineer of

Record of other alternative-design fasteners that meet the detailed requirements in

Section 2.8. If galvanized, ASTM F1852 twist-off-type tension-control bolt assemblies

are required in ASTM F1852 to be mechanically galvanized.

2.8. Alternative-Design Fasteners

When approved by the Engineer of Record, the use of alternative-design fasteners is

permitted if they:

(1) Meet the materials, manufacturing and chemical composition requirements of ASTM

A325 or ASTM A490, as applicable;

(2) Meet the mechanical property requirements of ASTM A325 or ASTM A490 in full-

size tests;

(3) Have a body diameter and bearing area under the bolt head and nut that is equal to or

greater than those provided by a bolt and nut of the same nominal dimensions specified in

Sections 2.3 and 2.4; and,

(4) Are supplied and used in the work as a fastener assembly. Such alternative-design

fasteners are permitted to differ in other dimensions from those of the specified high-

strength bolts and nuts. Detailed installation instructions shall be prepared by the

manufacturer in a supplemental specification that is approved by the Engineer of Record

and shall provide for:

(1) The required character and frequency of pre-installation verification;

(2) The alignment of bolt holes to permit insertion of the alternative-design fastener

without undue damage;

(3) The placement of fastener assemblies in all holes, including any washer requirements

as appropriate;

(4) The systematic assembly of the joint, progressing from the most rigid part of the joint

until the connected plies are in firm contact; and,

(5) The subsequent systematic pretensioning of all fastener assemblies in the joint,

progressing from the most rigid part of the joint in a manner that will minimize relaxation

of previously pretensioned bolts. Detailed inspection instructions shall be prepared by the

manufacturer in a supplemental specification that is approved by the Engineer of Record

and shall provide for:

(1) Observation of the required pre-installation verification testing; and,

(2) Subsequent routine observation to ensure the proper use of the alternative-design

fastener.

Attachment H

PROPOSED WORDING Commentary:

The policy of RCSC has been to only recognize fasteners and components which meet

approved ASTM specifications. Applicable ASTM standards referenced in this document

are listed in Section 1.5 and Section 2. However, alternate products, standards and

installation methods (known collectively as “alternative-designs”) may be used when

approved by the Engineer of Record. Alternative-designs fall into two categories:

(1) Product made as an alternative-design to an ASTM standard referenced in this

document and installed using RCSC installation methods or an alternate

installation method. See 2.8.1

(2) Product made to an ASTM standard that is not referenced in this document and

installed using RCSC installation methods or an alternate installation method. See

2.8.2

When using alternative-designs it is important that strength level and geometry are fully

considered so the requirements of joint design are met as intended by this standard.

Particularly important are strength requirements, such as tensile strength, shear strength

and minimum pretension, along with certain geometry vital to proper joint loading, such

as bearing area and bolt body diameter.

Alternative-design provisions are intended to provide flexibility to address unique needs

and design challenges, or to enable the use of alternate technology, standards and practices.

This includes products or technology which this committee may not have had the time to

fully consider, or products with a frequency of use which might not compel this committee

to detail such use in this document.

When using alternative-designs the other provisions of this standard shall still apply.

2.8. Alternative-Design Fasteners

2.8.1 When approved by the Engineer of Record, the use of alternative-designs as

replacements of or in supplement to those in Section 2 of this specification is permitted.

2.8.1.1 Fasteners must meet the minimum manufacturing, material and mechanical

properties of the grade and type being substituted in ASTM A563, F436, F959, or

F3125, as applicable.

2.8.1.2 When used in pretensioned or slip-critical connections, the alternative-

design or method must meet minimum pretension requirements in Table 8.1 for the

grade being substituted.

2.8.1.3 When the performance of the standard or the installation method requires

it, the fasteners shall be supplied and used in the work as a fastener assembly.

2.8.2 When approved by the Engineer of Record, the use of ASTM standards that are not

referenced within Section 2 of this specification is permitted.

2.8.2.1 Fasteners must meet the minimum manufacturing, material and

mechanical properties of an approved ASTM standard. Examples of these standards

are A194, A320, A354, A449, F2482, F3043, F3111 and F3148.

2.8.2.2 When considering strength levels other than those provided in this standard,

the ASTM standard or manufacturer shall provide, or the Engineer of Record shall

determine, the minimum specified values for at least:

a. Proof load and tensile strength

b. Nominal strength values for table 5.1

c. Fatigue strength values for table 5.2, as required

d. Minimum pretension values, as required

Attachment H

e. Washer requirements, as required or if different than Section 6

2.8.2.3 When the performance of the standard or the installation method requires

it, the fasteners shall be supplied and used in the work as a fastener assembly.

2.8.2.4 Alternative coatings shall meet the performance criteria as specified in the

alternative coating standard, and shall not have a detrimental effect on the fasteners,

specifically in conformance to 2.8.1.1 or 2.8.1.2.

2.8.3 Alternative-design fasteners are permitted to differ in dimensions from those

specified in Section 2 with the following exceptions:

2.8.3.1 Bolts shall have a body diameter and bearing area under the head equal to

or greater than that provided by an equivalent bolt in section 2.3 or 2.7.

2.8.3.2 Bolt thread lengths that differ from those in section 2.3 or 2.7 shall be clearly

identified and communicated to the Engineer of Record.

2.8.3.3 Nuts and washers shall have a bearing area that is equal to or greater than

provided by a nut or washer of the same nominal dimensions specified in Sections

2.4, 2.5 or 2.6 as applicable.

2.8.4 Installation instructions shall be provided in the ASTM standard or provided by the

manufacturer, and shall be approved by the Engineer of Record. These Instructions should

provide:

2.8.4.1 For pretensioned joints, the procedure and frequency of pre-installation

verification

2.8.4.2 The systematic assembly of the joint to the snug condition, progressing from

the most rigid part of the joint until the connected plies are in firm contact; and,

2.8.4.3 For pretensioned joints, the subsequent systematic pretensioning of all

fasteners in the joint, progressing from the most rigid part of the joint in a manner

that will minimize relaxation of previously pretensioned bolts.

2.8.5 Inspection instructions shall be provided in the ASTM standard or provided by the

manufacturer, and shall be approved by the Engineer of Record. These Instructions should

provide:

2.8.5.1 Required observation of the pre-installation verification testing, when

performed; and,

2.8.5.2 Subsequent routine observation to ensure the proper use of the alternative-

design.

Attachment I

From: Bob Shaw

Suggest that this figure use H1 for the head, and H2 for the

nut, as used in Table C2.1.