“Best of IBC” Webinar Series
The Best of IBC Webinar Series is a great way to preview the high quality technical content presented at the International Bridge Conference®.
Attendees can earn 1 pdh credit!
Virtual webinars are FREE to attend, but registration is required for pdh certification.
Topic: Rehabilitation, Part 1
Date/Time: Thursday, January 27, 2022 – 12:00 PM
IBC 21-14: Partial Steel Girder Replacement Due to Repeated Impact Damage and Use of Instrumentation to Monitor Effectiveness of Repair
Laura Magoon, P.E. and Christopher Kijak, P.E., RK&K, Baltimore, MD; David Barrett, Modjeski and Masters, Inc, Mechanicsburg, PA; Tekeste Amare, P.E., Maryland Transportation Authority, Baltimore, MD
The exterior steel girder of a 2-span continuous unit on a bridge over I-695 suffered repeated over-height vehicle impact damage. Heat straightening was ruled out and an alternate repair was provided to replace a portion of the damaged girder with a shallower section to provide additional clearance. Instrumentation indicated some permanent redistribution of the dead loads, with the live load properly distributed. This topic covers repair procedures and lessons learned to ensure proper load distribution.
IBC 21-18: Innovative Design Applications: 31st Street NW Bridge over C&O Canal, Washington, DC
Bradford Shaffer, Jason Bortz, Thomas Trapnell, and Elliott Mandell, AECOM, Arlington, VA; Mark Clabaugh, District DOT, Washington, DC
Replacement of 31st Street NW Bridge over the C&O Canal in Historic Georgetown had a multitude of unique constraints and stakeholder expectations as well as unknown challenges that were discovered during construction. This single span steel girder bridge on integral abutments was the 3rd bridge to span this location over the last 150 years.
The existing structure was supported by abutments founded on the historic canal walls of the C&O Canal, and a cast iron pier. Due to the age of the existing structure and canal, as-built information was minimal and an assessment determined the pier was no longer structurally viable; however, the substructure units were determined to be historically significant and required to be maintained in their current location. Preserving the historic elements required a single span structure, with the new abutments placed behind the canal walls and the rehabilitated pier serving as an architectural element only.
While designing a single 51’ span steel girder bridge is not typically challenging, the structural depth was severely restricted to 26” to maintain both the vertical clearance required below for safe passage of the tourist barge below and the vertical profile of the roadway. 31st Street is also a major utility corridor which required that 49 utility lines be maintained in place, most with uninterrupted service, as part of the bridge replacement.
Findings during construction led to value engineering using micropiles for the foundations as well as revising the deck to lightweight concrete to accommodate changes in construction staging and schedule.
IBC 20-17: Emergency Response and Repair of State Route 6 Bridge over French Creek following Over-Height Vehicle Strike
Frank Artmont, Ph.D., P.E., Modjeski and Masters, Mechanicsburg, PA; Andrew Adams P.E., Modjeski and Masters, Mechanicsburg, PA; Hadi Kenarangi, Ph.D., Modjeski and Masters, Mechanicsburg, PA; Christopher Smith, P.E., Modjeski and Masters, Mechanicsburg, PA; Mark Bredl, P.E., Pennsylvania DOT, Oil City, PA
In January 2019, an over-height vehicle struck a through-truss bridge carrying State Route 6 over French Creek in northwestern Pennsylvania, which caused severe damage to the truss verticals and necessitated the structure’s closure. This presentation will highlight the design stage work on the project, including the initial response, finite element analysis, and development of the repair schemes, which enabled the structure to be successfully repaired and reopened in under three months from the accident.
IBC 20-18: Rehabilitation and Widening of the Historic I-78 Mainline Spandrel Arch Bridge
Siew Chee, P.E., Crystal Lui, P.E., S.E., Carol Choi, P.E., Ing., CQM/ OE, Sajid Abbas, Ph.D., P.E., T.Y. Lin International, San Francisco, CA; Kerri Cutright, P.E., Kamlesh A. Ashar, P.E., Pennsylvania DOT, Allentown, PA
As one of the largest bridge projects in Pennsylvania, the I-78/ SR 61 Interchange Improvement is a multi-phased project currently under design and construction. Rehabilitation and widening of the historic I-78 multiple-span arch bridge over the Schuylkill River is a part of this larger scope. Built in 1955, the existing bridge includes an eight-span, concrete spandrel arch bridge with typical spans of 157.5 ft with an overall length of 1742 ft. The widened spandrel arch bridge will add one lane on each of the existing westbound and eastbound roadways, to a total of six traffic lanes with shoulders.
Topic: Accelerated Bridge Construction
IBC 20-08: EB Wilson Boulevard Bridge over Route 50: ABC Weekend Superstructure Replacement
Kelly Guild, P.E., WSP USA, Herndon, VA; John Michels, WSP USA, Herndon, VA; Alireza Hedayati, WSP USA, Herndon, VA; Vincente Valeza, Virginia DOT, Northern Virginia District, Fairfax, VA; Pooya Azar, Martins Construction Corporation, Falls Church, VA
In one of Northern Virginia’s busiest, most complicated and high traffic volume intersections, the superstructure of the EB Wilson Boulevard Bridge over Route 50 was demolished, removed, and replaced in a single weekend to minimize impact to the traveling public and local business community. The design utilized ABC methodology including three preconstructed composite units erected at the site using very early strength latex concrete deck closure pours providing the required cure time, strength and durability.
IBC 20-09: Wellsburg Bridge – Construction Methods and Float In
Charbel Raad, McNary Bergeron & Associates, Tampa, FL; Tim Davis, McNary Bergeron & Associates, Tampa, FL; Rob Brunner, Flatiron Construction, Wellsburg, WV
The Wellsburg Bridge is an 830-foot span basket-handle network tied arch connecting Wellsburg, WV and Brilliant, OH across the Ohio River. This arch span is being constructed using an Accelerated Bridge Construction method where the main span is built at a site roughly 1 mile upstream along the Ohio River and will be floated into its permanent position using a system of self-jacking falsework towers and barges.
IBC 20-01: Substructure Rehabilitation using Galvanic Encasement of the Frederick G Gardiner Expressway
David Whitmore, P.E., Vector Corrosion, Winnepeg, MB Canada; Rachel Stiffler, Vector Corrosion, Canonsburg, PA
Substructure rehabilitation and re-use was instrumental in minimizing traffic gridlock in the rapid bridge replacement of the Frederick G. Gardiner Expressway in Toronto, Ontario, the fourth largest city in North America.
The frequently traffic-jammed structures were over 50 years old, severely deteriorated and crumbling due to chloride-induced corrosion.
To minimize disruption to commuters, the substructures were structurally repaired using a galvanic encasement that will also provide corrosion protection for the next 30 to 40 years.
IBC 20-03: Weekend Deck Replacements of Four Interstate Bridges Utilizing a Simple Precast Deck System
Eddie He, Ph.D., P.E., S.E., AccelBridge, Hinsdale, IL; John Gonyea, Fort Miller, Schuylerville, NY
The Interstate I-89 bridges in Colchester, VT were replaced within a 59-hour weekend closures. AccelBridge was used due to its durability, speed and simplicity. The two key features of the deck system are: match-cast epoxy joints between precast deck panels and deck compression by jacking against supporting girders without the use of post-tensioning. By eliminating cast-in-place joints between panels, this deck system offers significant savings in materials, field labor and schedule.