This month’s newsletter includes information about:
- 2016 NSBA Prize Bridge Competition is now Accepting Submissions.
- NSBA Introduces New Version of NSBA Steel Bridge Suite.
- Steel Shots: Rollin' on the River.
- TRB AFF20: Workshop on "Service Life Engineering for Durable Steel Bridges".
- NSBA Continuous Span Standards are NOW Available for Free Download.
- Mark your Calendar for these Upcoming Events.
2016 NSBA Prize Bridge Competition is now Accepting Submissions
The Prize Bridge Competition, a prestigious industry awards program organized by the National Steel Bridge Alliance, honors significant and innovative steel bridges constructed in the United States. All award-winning bridges must be built of fabricated structural steel and located in the United States (defined as the 50 states, the District of Columbia, and all U.S. territories.) Eligible bridges must have been completed and opened to traffic between May 1, 2013 and September 30, 2015.
An independent panel of judges will select winners based upon the following criteria: innovation, aesthetics, economics, design and engineering solutions. Quality of submitted presentations, though not a criterion, is important. Entries may be judged in more than one category, but an entry can only receive one award.
Winners will be notified shortly after judging and we will make a public announcement of the winners in Modern Steel Construction magazine. Designers of the winning Prize Bridge entries will be presented with plaques and honored during the World Steel Bridge Symposium. Owners of the winning Prize Bridge entries will be presented with plaques and honored at an NSBA networking function banquet during the 2016 AASHTO Subcommittee on Bridges and Structures.
Major span - one or more spans greater than or equal to 400 ft.
Long span - Longest span equal to or greater than 250 ft. but less than 400 ft.
Medium span - Longest span equal to or greater than 140 ft. but less than 250 ft.
Short span - No single span greater than 140 ft.
Reconstructed - Having undergone major reconstruction, rehabilitation, or widening
Special purpose - Bridge not identifiable in one of the above categories including pedestrian, pipeline, and airplane
In addition to the above categories; NSBA will also offer special commendation to projects that best exemplify Accelerated Bridge Construction, and a full range of Sustainable attributes.
All entries are due by 11:59 pm, December 14, 2015.
To enter visit www.steelbridges.org/2016prizebridge.
NSBA Introduces New Version of NSBA Steel Bridge Suite
In keeping with the NSBA’s continued commitment to supporting the bridge design community, we are pleased to announce that on June 25, the National Steel Bridge Alliance officially released an update to NSBA Steel Bridge Suite. This new version includes updates to the AASHTO/NSBA Steel Bridge Collaboration Standards and enhancements to LRFD Simon.
AASHTO/NSBA Steel Bridge Collaboration Standards
Updates to the Collaboration Standards are:
· S8.1 - Guide Specification for Application of Coating Systems with Zinc-Rich Primers to Steel Bridges.
· S10.1 - Steel Bridge Erection Guide Specification.
· G13.1 - Guidelines for Steel Girder Bridge Analysis.
This new version of LRFD Simon includes the following key enhancements:
· 7th Edition AASHTO Specification Support.
· Internally Calculated Distribution Factors.
· Deck Pour Analysis.
· Web Depth Optimization.
· New User Documentation.
· An Assortment of Bug Fixes.
Please visit the NSBA Steel Bridge Suite Registration and Request page to register and download this new version.
About LRFD Simon
LRFD Simon is NSBA’s complimentary software for preliminary steel plate and box girder design. Simon has a long history of serving as a key tool in helping bridge engineers efficiently design and analyze steel bridges. Resources and tools like LRFD Simon are an integral part of assisting designers to more rapidly evaluate design alternatives and make more educated decisions that will hopefully result in more economical steel designs and an overall better end product for Owners.
Steel Shots: Rollin' on the River
The new eastbound bascule span of the Pasquotank River Bridge in Elizabeth City, N.C., is open to the public. The 144-ft span culminates over four years of design and construction work on the bridge, which included demolition of the original 1931 structure. The bridge carries US 158 automotive, bicycle and pedestrian traffic over the Pasquotank River.
Both of the bridge’s 1-million-lb bascule leafs contain about 450,000 lbs of AASHTO M270 Grade 50 structural steel. Prospect Steel in Little Rock, Ark. (an AISC/NSBA Member and AISC Certified fabricator) was the steel fabricator for the project.
Bridge engineering firm Modjeski and Masters provided the structural, mechanical, and electrical design for the bridge replacement: “The most challenging aspects of the design process were balancing loads on an asymmetrical span while reducing the overall weight of the structure,” said Kevin Johns, director of the movable bridge unit at Modjeski and Masters. “As a bascule span is constantly in motion, it’s important to reduce structural weight where possible. Our team did so by using lightweight concrete in the grid deck and sidewalks. Additionally, dense Styrofoam was used in the design to lighten half of the counterweight section and create precise balance for the bridge.
Another noteworthy aspect of the project was our persistent focus on enhancing maintainability by developing a design which provides ease of access to all components that require routine or periodic maintenance.”
The new bridge is part of the North Carolina State Transportation Improvement program that will replace 838 bridges across the state. This project is expected to stimulate economic integration between neighboring Camden, Pasquotank and Perquimans Counties and smooth automotive traffic flow through Elizabeth City, which is considered the heart of the region. It will also make it easier for boat traffic to navigate the Pasquotank River.
A photo gallery of last month’s opening ceremony can be found here.
Modjeski and Masters is also involved with rehabilitating the westbound span. Construction on its redecking, new electrical system, structural repairs, and the replacement of some of its machinery is expected to finish before the end of the year.
Photo courtesy of NCDOT
TRB AFF20: Workshop on "Service Life Engineering for Durable Steel Bridges".
In collaboration with the AASHTO SCOBS T-14, Technical Subcommittee on Structural Steel Design and multiple related TRB Committees (AFH40, AFH70, AHD30, AHD30(2), AHD35, AHD37), the TRB AFF20 Steel Bridge Committee will be sponsoring a workshop at the 2016 TRB Annual Meeting on the subject of “Service Life Engineering for Durable Steel Bridges.” This four hour workshop will be on Thursday morning, January 14th. AFF20 is seeking presentations that are focused on current or needed innovations in design, construction, and maintenance to achieve long lasting durable steel bridges, whether they are existing or new steel bridges. Actual case studies showing demonstrated positive results as well as lessons learned are encouraged. The time allowed for each presentation will be a strict 20 minutes, including questions. It is anticipated that there will be strong interest in this topic and expect to receive more presentation requests than the number of available slots.
Individuals who would like to make a presentation at this workshop are requested to submit a short paragraph describing the presentation subject, no later than July 30th, 2015.
A notice will be send out by August 30th, 2015 to all that submitted with the final agenda of selected presentations. Members of AFF20 will be the selection committee.
Please submit abstracts to Barton Newton at firstname.lastname@example.org and Norm McDonald at email@example.com.
NSBA Continuous Span Standards are NOW Available for Free Download
The National Steel Bridge Alliance (NSBA) has released their Continuous Span Standards for steel plate girder bridges. The standards address three- span bridges with center spans between 150 feet and 300 feet and balanced end spans at 78% of main span length. All information is presented in easy-to-understand tables. Tabulated information includes: flange and web plate sizes, diaphragm spacing, intermediate stiffener locations, girder weights and total weights, shear stud spacing, and camber tables. Girder spacings range from 7.5 feet to 12 feet with homogenous and hybrid plate solutions available.
The standards remove the iterative work required to obtain an economical preliminary steel bridge solution during the TS&L phase of design. For a free copy of the standards, visit www.steelbridges.org/spanstandards.
Mark your Calendars!
Did you miss us at the International Bridge Conference in Pittsburgh, PA.? Come visit us at these upcoming events.
NSBA Booth at the International Bridge Conference (June 7 - 11) in Pittsburgh, PA.