nsba steel industry updateftp.dot.state.tx.us/.../texas-steel/120117/nsba-update.pdf ·...

1 l www.steelbridges.orgNational Steel Bridge Alliance

A Division of the American Institute of Steel Construction

NSBA Steel Industry Update

West Regional Director

Jeff Carlson

2 l www.steelbridges.org

Upcoming Events & Educational Activities


8th Edition AASHTO LRFD Update

• NSBA Webinar Series – Review of changes in next AASHTO LRFD Specification.– First Webinar – New bolted splice design

procedure (March 14, 2017).– Second Webinar – Overview of Top 10 changes

in the next specification edition (December 13 2017).

• Free registration for DOTs


Upcoming AASHTO Code Changes – 2017• Changes to Note:

– Fatigue Load Factors– Simplified Bolted Splice Analysis and Design– Max Shear Stud Spacing– Must Call Out Fit Condition– Clarification of Cross Frame Layout for Skewed

Bridges– F3125 Bolts, Increase in Strength, Slip Critical– Hole Sizes (>1”)


Upcoming AASHTO Code Changes – 2017 – Cont.


2018 World Steel Bridge Symposium• 2018 World Steel Bridge Symposium.

– April 11 – 14.– Baltimore Convention Center - Baltimore, Md.– Co-located with AISC Steel Conference –

NASCC.• 2 Concurrent Bridge Tracks.

– 81 Abstracts Submitted.– 25 Bridge Sessions Planned.– 64 Speakers Selected.

• I have free registration vouchers!


2018 Prize Bridge

Competition


Criteria for a 2018 Prize Bridge

• Bridges are built of North American fabricated structural steel and located in the United States.

• Bridges must be open to traffic between May 1, 2015 and September 30, 2017.

• Bridges should be representative of how the industry is progressing through one of the following:

Innovation, Economics, Aesthetics, Design and Engineering Solutions.


Categories for 2018

• 7 categories representing bridges of all sizes, ages and uses.– Major span – One or more spans ≥ 400 ft.– Long span – Longest span ≥250 ft. but 140 ft.– Movable span– Reconstructed – Having undergone major reconstruction,

rehabilitation, or widening– Special purpose – Bridge not identifiable in one of the above

categories including pedestrian, pipeline, and airplane


To Enter…


• Spring 2018 Meeting– May 1-3– Minneapolis, MN– RSVP Today

• More Information:[email protected]

AASHTO/NSBA Collaboration


Newest Collaboration Document


Next NSBA Led “Bridges to Prosperity” Trip


Lurá

“Bridges to Prosperity” -Panama

Near Santiago


Designer Resources

Early Costing & Preliminary Girder Sizing


Steel Bridge Design Resources

• Span to Weight Charts– Used during preliminary design– Evaluate alternate structures– Quickly determine relative costs



0.00

10.00

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50 75 100 125 150 175 200 225 250 275 300 325 350

Bridge

Weight in psf B

ridge

Deck (psf)

Span (ft)

Two Span ‐ 9' to 11' Girder Spacing

Trendline

Preliminary Estimate:28 psf ± 4sf

Estimated Cost ($/sf) = Bridge Weight (psf) x Bridge Area (sf) x Historical Cost Estimate

• Span to Weight Charts



• Continuous Span Standards



• Continuous Span Standards– Center Span: 150 ft – 300 ft– End Spans: 78% of center span– Girder Spacing: 7ft – 6in through 12ft – 0in– Homogeneous and hybrid solutions– Web depth to suite material efficiency

• AASHTO 7th Edition LRFD• 88 Unique Solutions

www.steelbridges.org/SpanStandards


Conceptual Solution – Girder Sizing


• Continuous Span Standards Download



• 2 – Span Standards – In Development



Designer Resources

More Exact Solution


• LRFD Simon– Steel Plate and Tub Girder Analysis and Design– Currently Updating to 8th Edition


www.steelbridges.org/SoftwareRegistration


Splice Design Aid

Go To:www.steelbridges.org

Then click on:“NSBA Splice” to download


Splice Design Aid On YouTube

Go to YouTube and search for “New AASHTO Design Method for Bolted Field Splices”


Questions?


[email protected] - (720) 440-3011

www.steelbridges.org

@SteelBridges

Contact Us

nsba steel industry updateftp.dot.state.tx.us/.../texas-steel/120117/nsba-update.pdf ·...

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