national steel bridge alliance
TRANSCRIPT
![Page 1: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/1.jpg)
Steel: The Bridge Material of Choice
National Steel Bridge Alliance A division of the American Institute of Steel Construction
www.steelbridges.org
National Steel Bridge Alliance
Christopher Garrell, PE, LEED AP NSBA - Southeast Regional Director [email protected]
Kentucky Association of Professional Engineers Seminar
![Page 2: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/2.jpg)
National Steel Bridge Alliance Overview
![Page 3: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/3.jpg)
• Supporting Designers and Owners throughout the Bridge Lifecycle.
NSBA Activities
Design
Planning Design
Operate
Management Maintenance
Build
Construction Fabrication
3 | www.steelbridges.org
![Page 4: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/4.jpg)
NSBA Activities
NSBA
Steel Fabricators
Steel Producers Erectors Coatings
Producers Welding Industry
Design Community
Engineering Consultents Professors Students
Owners
State Highway Departments
County Highway
Departments
Federal Highway Authority
Toll Road Authorities
4 | www.steelbridges.org
![Page 5: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/5.jpg)
NSBA Regions
Northeast Bill McEleney
Cell: 401.965.6341
Email: [email protected]
Southeast Christopher Garrell, PE, LEED AP
Cell: 484.557.2949
Email: [email protected]
West-Southwest Calvin R. Schrage
Cell: 402.440.3729
Email: [email protected]
5 | www.steelbridges.org
![Page 6: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/6.jpg)
Material Availability Rolled Beams and Plate
![Page 7: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/7.jpg)
Rolled Beam Availability
• Rolled beam generally more economical.
• Except with hard curve or camber.
• Availability dependent on rolling schedules.
7 | www.steelbridges.org
![Page 8: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/8.jpg)
Rolled Beam Availability
• Availability – NUCOR YAMATO - to 44” deep. – Gerdau Ameristeel - to 36” deep. – Steel Dynamics - to 36” deep. – 120’ long – max. – ASTM A992; ASTM A709, Gr. 50S
• Minimum Yield = 50 ksi • No HPS
• Allow plate girder alternate.
8 | www.steelbridges.org
![Page 9: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/9.jpg)
Mill Plate Availability
9 | www.steelbridges.org
![Page 10: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/10.jpg)
•Plate Availability Maximums
Mill Plate Availability
Producer Maximum Thickness (in)
Maximum Width (in)
Arcelor-Mittal 4 195
Nucor Steel 3 123
SSAB 3 120
EVRAZ 4 144
10 | www.steelbridges.org
![Page 11: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/11.jpg)
• Rationalize all mill plate tables
Mill Plate Availability
ArcelorMittal
Evraz
SSAB
Nucor
11 | www.steelbridges.org
![Page 12: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/12.jpg)
• Composite Mill Plate Tables
Mill Plate Availability
* A709-50 and A709-50W (Non-FC) Availability only.
12 | www.steelbridges.org
** Refer to September 2011 issue of Modern Steel Construction Magazine.
![Page 13: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/13.jpg)
13 | www.steelbridges.org
Mill Plate Availability
• Thickness Increments
− 1/8” for plate up to 2 1/2” thick.
− 1/4” for plate over 2 1/2” thick.
• Width Preferences
− Fabricators prefer 72” and 96” widths.
− Cost increases with width.
![Page 14: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/14.jpg)
Design Considerations Choices Affecting Cost
![Page 15: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/15.jpg)
• Usable Plate Area
Design Considerations
Flange Plate Web Plate (Haunched)
15 | www.steelbridges.org
![Page 16: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/16.jpg)
Design Considerations
• Usable Area – Web Plate
• Width: 1” – 4” • Length: 1” – 6” • Material loss will increase if web is haunched or cambered.
– Flange Plate • Width: 1” – 4” total plus an additional 1/4" per burn. • Length: 1”- 6” • A fabricator may choose to increase flange widths specified by
the Engineer from 1/4" - 3/8". – Can vary from fabricator to fabricator and can be
dependent on their capabilities and equipment.
16 | www.steelbridges.org
![Page 17: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/17.jpg)
Design Considerations
• Girder Spacing - Wider is more economical. - A reduced number of girders (fewer linear feet) to be
detailed, fabricated, painted, transported, erected, inspected and maintained.
- Fewer diaphragms, crossframes and bearings. - MAYBE more pounds, but FEWER dollars.
17 | www.steelbridges.org
![Page 18: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/18.jpg)
Design Considerations
• Girder Spacing - Use 10’ to 11’ with spans less than 140’. – Use 11’ to 14’ with spans greater than 140’. – Cost of thicker deck to accommodate wider spacing.
• Thicker deck may increase life.
• More dead load per girder may reduce vibration.
– Consider future redecking operations during preliminary design.
18 | www.steelbridges.org
![Page 19: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/19.jpg)
Girder Spacing
19 | www.steelbridges.org
Design Considerations
![Page 20: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/20.jpg)
Design Considerations
• Flange Shop Splices – No more than 2 shop slices. – Minimum change; 1/8” (to 2 ½” thick), 1/4”. – Maximum change; thinner piece at least 1/2 of thicker. – ONLY when material cost saved > labor cost spent. – Keep width constant (i.e., to change cross section area,
change thickness).
20 | www.steelbridges.org
![Page 21: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/21.jpg)
• Flange Sizing - change width
Bevel
Step 1: Bevel (4) Plate Edges
Fabricate 4 Flange Assemblies
Design Considerations
21 | www.steelbridges.org
![Page 22: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/22.jpg)
Burn
Step 2: Burn 12 Pieces From 3 Plates
• Flange Sizing - change width
Design Considerations
22 | www.steelbridges.org
![Page 23: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/23.jpg)
![Page 24: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/24.jpg)
Step 3: Fit up and tack weld 4 flange assemblies
• Flange Sizing - change width
Design Considerations
24 | www.steelbridges.org
![Page 25: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/25.jpg)
Step 4: Attach 16 run-off tabs
Run-off Tab
• Flange Sizing - change width
25 | www.steelbridges.org
Design Considerations
![Page 26: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/26.jpg)
![Page 27: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/27.jpg)
Step 5: Weld and grind 8 splices
Weld
• Flange Sizing - change width
27 | www.steelbridges.org
Design Considerations
![Page 28: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/28.jpg)
Step 6: Turn over 4 flange assemblies
• Flange Sizing - change width
Design Considerations
28 | www.steelbridges.org
![Page 29: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/29.jpg)
Step 7: Back gouge, weld and grind 8 butt joints
Weld
• Flange Sizing - change width
29 | www.steelbridges.org
Design Considerations
![Page 30: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/30.jpg)
Step 8: Remove and grind 16 run-off tabs, taper wider plates
• Flange Sizing - change width
Design Considerations
30 | www.steelbridges.org
![Page 31: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/31.jpg)
Bevel
Step 1: Bevel (4) and Taper (2) Plate Edges
• Flange Sizing - change thickness
Change Thickness
Taper
31 | www.steelbridges.org
Design Considerations
![Page 32: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/32.jpg)
Step 2: Fit up and tack weld 3 plates
• Flange Sizing - change thickness
Design Considerations
32 | www.steelbridges.org
![Page 33: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/33.jpg)
Step 3: Attach 4 run-off tabs
Run-off Tab
• Flange Sizing - change thickness
Design Considerations
33 | www.steelbridges.org
![Page 34: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/34.jpg)
Step 4: Weld and grind 2 splices
Weld
• Flange Sizing - change thickness
Design Considerations
34 | www.steelbridges.org
![Page 35: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/35.jpg)
Step 5: Turn over 1 piece
• Flange Sizing - change thickness
Design Considerations
35 | www.steelbridges.org
![Page 36: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/36.jpg)
Step 6: Back gouge, weld and grind 2 butt welds
Weld
• Flange Sizing - change thickness
Design Considerations
36 | www.steelbridges.org
![Page 37: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/37.jpg)
Step 7: Remove and grind 4 run-off tabs
• Flange Sizing - change thickness
Design Considerations
37 | www.steelbridges.org
![Page 38: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/38.jpg)
Step 8: Burn 4 flanges from 1 assembly
Burn
• Flange Sizing - change thickness
Design Considerations
38 | www.steelbridges.org
![Page 39: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/39.jpg)
Step 8: Burn 4 flanges from 1 assembly
• Flange Sizing - change thickness
Design Considerations
39 | www.steelbridges.org
![Page 40: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/40.jpg)
Design Considerations
• Flange Sizing – Width transitions increase labor for flange assemblies
up to 35%. – If you must change flange width, do so at bolted field
splice (do not clip corners of top flanges). – Allow fabricators to eliminate splices within a shipping
piece by carrying thicker material through to next designed splice location.
40 | www.steelbridges.org
![Page 41: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/41.jpg)
Design Considerations
• Flange Sizing
41 | www.steelbridges.org
![Page 42: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/42.jpg)
More Information Online Sources
![Page 43: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/43.jpg)
AASHTO/NSBA Steel Bridge Collaboration
G12.1 Design for Constructability
Modern Steel Construction
Steel Plate Availability for Highway Bridges
43 | www.steelbridges.org
More Information
![Page 44: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/44.jpg)
• NSBA Website – www.steelbridges.org – “Resources” – “AASHTO/NSBA Steel
Bridge Collaboration”
• MSC Magazine – www.modernsteel.com
More Information
44 | www.steelbridges.org
![Page 45: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/45.jpg)
LRFD Simon Software Solution for Preliminary Steel Bridge Design
![Page 46: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/46.jpg)
• Key tool for efficient preliminary design and analysis of steel bridges.
• Made steel a more appealing material of choice from project inception.
• Validation for design and analysis calculation.
• Usage – Over 500 individual licenses. – 97 Government licenses including FHWA and DOTs. – 11 Colleges and Universities. – Basis of NSBA Design Studies.
• Right tool for the best material choice - steel.
46 | www.steelbridges.org
LRFD Simon
![Page 47: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/47.jpg)
• Collaboration with Wisconsin Department of Transportation.
• Analysis Core - Phase I – Update 4th Edition LRFD Specification to 5th Edition
LRFD Specification. – Work completed late 2011.
• User Interface – Phase II – Preliminary workflow and design completed. – Interim Beta releases to be made available. – Release Candidate (RC) scheduled for April with final
commercial release to follow.
LRFD Simon
47 | www.steelbridges.org
![Page 48: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/48.jpg)
• Modern Windows user interface.
• Workflow driven input.
• Corporate/Agency definable settings.
• Customizable output.
LRFD Simon
48 | www.steelbridges.org
![Page 49: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/49.jpg)
LRFD Simon
• 34 Delivered Examples – 1, 2, 3 and 4 Span Configurations. – Plate Girder and Box Girder.
49 | www.steelbridges.org
![Page 50: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/50.jpg)
• Google Group – Beta Release Information. – Product and Documentation Downloads. – Community Discussion Forum. – Invitation by Request.
LRFD Simon
50 | www.steelbridges.org
![Page 51: National Steel Bridge Alliance](https://reader030.vdocument.in/reader030/viewer/2022012521/61958f953c11a04a5104b438/html5/thumbnails/51.jpg)
• “Release Candidate” to be distributed at World Steel Bridge Symposium.
• Special session on design using LRFD Simon on Wednesday April 18.
• Visit www.steelbridges.org/wsbs for more information.
LRFD Simon
51 | www.steelbridges.org