PennDOT wins two awards for innovation. One for the rehabilitation of the Liberty Bridge which received a new Exodermic deck. Announcement of the award can be viewed on Your Erie at the following link: Your Erie
The Liberty Bridge deck replacement was featured in Roads & Bridges. The entire article can be viewed Here.
View Gridline Newsletter #18 on the BGFMA website by clicking the following link: Gridline #18
Featured articles:
“Meet Chris Davis” concludes the introduction of BGFMA Certified Fabricator members whose many years of experience can be valuable to provide sound advice during plan preparation, fabrication, and installation.
I-895 receives an ultra-light deck replacement specified to not exceed 50 pounds per square foot utilizing 4500 psi, 100 pcf all lightweight concrete while still providing a 2″ integral concrete overfill.
The BGFMA teamed up with George Patton, PE, MSCE of Hardesy & Hanover to make a joint presentation at the most recent Heavy Movable Bridge Symposium on “Movable Bridge Lightweight Concrete Deck Design and Construction Considerations.” The paper can be accessed through the newsletter.
The BGFMA says goodbye to Executive Director Mark Kaczinski, PE who retired.
A partially filled concrete grid bridge deck was selected as a major component of the solution for the lightweight superstructure replacement on I-895 over Patapsco River Flats for the Maryland Transportation Authority (MDTA).
Due to the limited load capacity of the substructure and the desire to maintain an HS-20 design live load, Rummel, Klepper & Kahl, LLP specified a deck weight not to exceed 50 pounds per square foot utilizing 4500 psi, 100 pcf all lightweight concrete while still providing a 2” integral concrete overfill.
Although accelerated bridge construction (ABC) was not a requirement for this project, grid reinforced concrete decks have long been utilized by toll agencies to accelerate the speed of construction. McLean Contracting Company is expected to wrap up construction in 2019.
The entire article can be found on the Roads & Bridges website by clicking here.
Route 37 EB Mathis Bridge – NJ’s Largest Precast Exodermic® Deck Replacement Project was the subject of a recently featured webinar hosted by the ABC-UTC at FIU. Click on the link to view the video recording of the presentation, a PDF version of the presentation and the Q and A.
Route 37 EB Mathis Bridge – NJ’s Largest Precast Exodermic Deck Replacement Project
Load rating is the determination of the safe live load carrying capacity of a highway structure. It is usually expressed as a Rating Factor (RF) or in terms of tonnage for a particular vehicle. Rating frequency may vary by owner but is usually performed in the design stage, initial inventory inspection, when there is a change of live loading or dead load on the structure, or if there is a physical change in any structural member of the bridge. The Manual for Bridge Evaluation, Third Edition, 2018 (MBE) implies that decks should be rated as a main load carrying component of the superstructure. Some owners may overlook this requirement for conventional reinforced concrete decks but require rating of grid reinforced concrete and Exodermic® decks for new construction.
Click here to view this latest technical bulletin (and all previous) and read how the BGFMA V3.1 design program can be used to supplement the MBE and AASHTO LRFD Design Specifications to load rate a deck (including an example).
View Gridline Newsletter #18 on the BGFMA website by clicking the link below and opening the newsletter http://bgfma.org/news.htm
Featured articles:
“Meet Timothy Pace, P.E.” continues the introduction of BGFMA Certified Fabricator members whose many years of experience can be valuable to provide sound advice during plan preparation, fabrication, and installation.
One of the more frequent questions asked of the BGFMA is to provide an approximate cost for a project. The BGFMA took a closer look at the winning bids of three projects and summarized the deck costs in “Engineer’s Estimate for Grid Reinforced Concrete and Exodermic Bridge Decks.” The projects include features of ABC construction, lightweight bridge deck applications, and precast concrete bridge deck panels to name a few.
The BGFMA recently donated Exodermic panels, rebar and form pans to Purdue University’s S-BRITE Center to be installed on a pony truss taken out of service. The addition will enhance the gallery that serves to educate students, inspectors and professional engineers.
Georgia DOT once again incorporates precast grid reinforced concrete panels for accelerated bridge construction but this time, not for the typical reasons. Read the whole story in the April edition of Roads & Bridges Magazine.
http://mydigimag.rrd.com/publication/?i=487297#{%22issue_id%22:487297,%22page%22:62}
TECH-LINE #17 is now available online! In this issue, the BGFMA provides equations to determine the neutral axis for grid reinforced concrete and Exodermic bridge decks using the transformed area method assuming the section is cracked. Once determined, the moment of inertia and section moduli for selected locations can be calculated. To view the latest TECH-LINE and/or past bulletins & reports visit http://bgfma.org/bulreports.htm
Over 170,000 square feet of deck surface was replaced in an accelerated bridge construction (ABC construction) project highlighting Pennsylvania’s first use of an Exodermic deck. Modular steel bridge deck panels were installed by both cast-in-place and precast methods.
Designers at HDR in Pittsburgh took advantage of the lightweight features of the Exodermic deck instrumental to remove the bridge from the states structurally deficient list.
“We selected Exodermic deck panel construction for this project due to its high strength to weight ratio and suitability for modular precast construction. Accelerated construction using precast units on the north end of the bridge prevented significant weekday traffic impacts,” states Nick Burdette, P.E., of HDR.
The entire article can be found on the Roads & Bridges website by clicking here.
View Gridline Newsletter #17 on the BGFMA website by clicking the link below and opening the newsletter http://bgfma.org/news.htm
Featured articles:
“Meet Darko Jurkovic, P.E.” continues the introduction of BGFMA Certified Fabricator members whose many years of experience can be valuable to provide sound advice during plan preparation, fabrication, and installation.
“Getting into the Swing of It,” showcases the use of a lightweight Exodermic deck on the new Gasparilla Island Swing Bridge specified for its structural efficiency.
The results of the 2017 ASCE/AISC National Student Steel Bridge Competition are summarized.
“Grid Facts” presents in-service grid reinforced concrete decks that that have surpassed the current 75 year design life will most likely reach the 100 year bridge service life ultimate goal.