NSBA Steel Industry Updateftp.dot.state.tx.us/.../texas-steel/120117/nsba-update.pdf ·...
Transcript of NSBA Steel Industry Updateftp.dot.state.tx.us/.../texas-steel/120117/nsba-update.pdf ·...
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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
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Upcoming Events & Educational Activities
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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
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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”)
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Upcoming AASHTO Code Changes – 2017 – Cont.
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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!
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2018 Prize Bridge
Competition
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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.
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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
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To Enter…
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• Spring 2018 Meeting– May 1-3– Minneapolis, MN– RSVP Today
• More Information:[email protected]
AASHTO/NSBA Collaboration
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Newest Collaboration Document
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Next NSBA Led “Bridges to Prosperity” Trip
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Lurá
“Bridges to Prosperity” -Panama
Near Santiago
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Designer Resources
Early Costing & Preliminary Girder Sizing
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Steel Bridge Design Resources
• Span to Weight Charts– Used during preliminary design– Evaluate alternate structures– Quickly determine relative costs
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Steel Bridge Design Resources
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Weight in psf B
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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
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Steel Bridge Design Resources
• Continuous Span Standards
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Steel Bridge Design Resources
• 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
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Conceptual Solution – Girder Sizing
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• Continuous Span Standards Download
Steel Bridge Design Resources
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• 2 – Span Standards – In Development
Steel Bridge Design Resources
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Designer Resources
More Exact Solution
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• LRFD Simon– Steel Plate and Tub Girder Analysis and Design– Currently Updating to 8th Edition
Steel Bridge Design Resources
www.steelbridges.org/SoftwareRegistration
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Splice Design Aid
Go To:www.steelbridges.org
Then click on:“NSBA Splice” to download
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Splice Design Aid On YouTube
Go to YouTube and search for “New AASHTO Design Method for Bolted Field Splices”
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Questions?
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[email protected] - (720) 440-3011
www.steelbridges.org
@SteelBridges
Contact Us