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ADM 2010 to 2015 Possible Implications
for LRFD STLS
Jay A. Puckett, PE, PhD, FASCE
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Workshop for AASHTO’s New Load and Resistance Factor
Specifications
for Structural Supports for
Highway Signs, Luminaires and Traffic Signals (SLTS)
Host: Caltrans
In cooperation with the
National Academies of Sciences National Cooperative Research
Program
June 5, 2015
Sacramento, CA
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Topics Leader Topic Examples Jay Puckett Introduction,
Motivation, Overview
and walk through
Michael Barker and Jay Puckett
Wind Loads, Calibration, Calibration demonstration, and example
determination of loads, load factors, and load effects
Calibration Example Example Wind Load on a VMS monotube
Jay Puckett Fatigue research, specification checks, and
example
Wind Fatigue loads on VMS monotube and high-mast tower
Resistance computations for base connections
Michael Barker Steel resistance overview and example
specification check
Extreme limit state design review for VMS monotube and high-mast
tower
Michael Garlich Fabrication, Construction, Inspection and Asset
Management
Example inspection of a SLTS Example of an Asset management
system
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Summary of ADM Changes ADM Description SLTS
A.3.1 modulus of elasticity, compressive yield strength and
shear ultimate strength
Language changes, simplification, table changes, fire (n/a)
A.3.3 cast alloy strengths Possible Section II changes
(minor)
D.3.2 effective net area Minor language changes, rectangular
sections added
E.2 axial compression member buckling strength Significant
language change, implications (TBD)
E.2, F.2.1.4 alternative methods for determining column and beam
elastic strengths
Significant language change, implications (TBD)
F.1 flexural strength
F.2 flexural strength Recognizes strain hardening, significant
language change
F.3 flexural strength
G.3 shear in webs supported on one edge New language, likely n/a
SLTS
G.5 shear strengths of rods New language, add to SLTS
G.1 shear and torsional strengths Phi for shear rupture, recast
equations to forces (from stress)
H.2 shear and torsional strengths More explicit language,
implications (TBD)
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Summary of ADM Changes ADM
J.2 welded connections Change language, use shear stress as
variable rather than absolute strength, implications (TBD)
J.3.7 slip-critical connections Changed language, not examined
in detail
J.6 pins Changed language, not examined in detail
M.2 fabrication of edges (smoothness) Changed language, Section
II, implication (TBD)
M.4 fabrication of edges (hole punching) Changed language,
Section II implication (TBD)
M.7 contact with dissimilar materials More explicit, review for
Section II
Chapter N quality control and quality assurance New chapter,
review for Section II
Appendix 1 Testing Good section for reliability-based phi
factors based upon testing
Appendix 3 Fatigue New section on fabrication methods for welds,
implication TBD
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Chapter A – General Provisions • modulus of elasticity,
compressive yield strength and shear ultimate strength (A.3.1) •
cast alloy strengths (A.3.3)
2015 2010
Simplified to constant E
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• A.3.1.3 removed, see new table below
2015 2010
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2015
2010
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Com
men
tary
2015
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Com
men
tary
2015
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Com
men
tary
2015
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Com
men
tary
2015
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Table 4.1 and 4.2 are in Appendix 4 – Design for Fire
Conditions
2015 2010
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A3.3 Castings
2015 2010
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Chapter D – Tension Members
2015 2010
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Chapter E – Axial Com
mentary
2015
A lot of language and Equation changes, in Term of λ factors,
etc.
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Chapter F – Flexural flexural strength (F.1, F.2, F.3, F.4)
2015
A lot of language and equations changed
Finish this section
Recognizes the increased strength due to strain hardening
similar to AISC
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Com
men
tary
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Chapter G – Shear
2015 2010
Recast to force from stress
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Chapter G – Shear
New Section
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Com
men
tary
2015
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Chapter G – Shear
New Section
2015
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Chapter H – Combined Forces and Torsion
2010
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Chapter H – Combined Forces and Torsion
2015 2015
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Chapter J – Connections
welded connections (J.2) • slip-critical connections (J.3.7) •
pins (J.6)
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Chapter M – Fabrication
2015 2010
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Chapter M – Fabrication
2015 2010
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2015 2010
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2015 2010
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Chapter N – Quality Control
New Chapter – 2 pages Review for Fabrication Section
2015
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Appendix 1 – Testing
Not used within Section 6 However, good information on
Establishing resistance factors based upon the testing program.
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Appendix 3 – Fatigue
2015
New Section Review for Fabrication Section
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Summary
• Significant language and equation changes are included
throughout
• A non-trivial effort will be required to adjust the SLTS
• Overall implications on some article changes are TBD for SLTS
at this time
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A Basic question -- food for thought
• Should SLTS just reference ADM and provide any modifications
or adjustments?
• Simplify to poles only?
ADM 2010 to 2015�Possible Implications�for �LRFD STLSSlide
Number 2TopicsSummary of ADM ChangesSummary of ADM ChangesChapter A
– General ProvisionsSlide Number 7Slide Number 8CommentarySlide
Number 10Slide Number 11Slide Number 12Slide Number 13A3.3
CastingsChapter D – Tension MembersChapter E – AxialChapter F –
FlexuralSlide Number 18Chapter G – ShearChapter G – ShearSlide
Number 21Chapter G – ShearChapter H – Combined Forces and Torsion
Chapter H – Combined Forces and Torsion Chapter J –
ConnectionsChapter M – FabricationChapter M – FabricationSlide
Number 28Slide Number 29Chapter N – Quality ControlAppendix 1 –
TestingAppendix 3 – FatigueSummaryA Basic question --�food for
thought
