ESWP: International Bridge Conference®: Rehabilitation 2

Rehabilitation, Part 2

Wednesday, June 4, 2008
1:30PM - 3:45PM

Chair: Matthew A. Bunner, PE, HDR, Inc., Pittsburgh, PA

IBC 08-90 - A Model to Measure Performance of Concrete Bridges Strengthened with FRP-Composite Structural Systems
Kenneth C. Crawford, Directorate of Civil Engineering, DOD - Air Force, Edwards AFB, CA

FRP (fiber reinforced polymer) structural systems provide a means for economical and rapid repair of concrete bridges but long-term FRP durability and bridge performance are an open question. This paper presents a model to inspect and test FRP system durability assess deterioration factors, and measure performance of the FRP-strengthened bridges.

IBC 08-91 - Crack Repairs to a Fracture-Critical Cross-Girder on the I-476 Bridge over the Schuylkill River
John Milius, PE, DMJM Harris / AECOM, Philadelphia, PA; Ian Hodgson, PE, SE, The ATLSS Center, Lehigh University, Bethlehem, PA

Cracks were recently discovered in the web of a fracture-critical cross-girder on the I-476 Bridge over the Schuylkill River 12 miles west of Philadelphia. The cracks resulted from out-of-plane distortion of the web at the base of a connection plate. This paper illustrates the cause of the cracking, outlines the objectives of a field testing and retrofit design program, and presents the results of retrofit repairs and post-repair monitoring program.

IBC 08-92 - Evaluation and Rehabilitation of the Deer Isle Suspension Bridge
Evan Lowell, PE, TranSystems | Lichtenstein, Natick, MA

The Deer Isle Bridge is the only roadway connecting Deer Isle, ME to the mainland. This slender bridge has received numerous improvements to stiffen the superstructure, as it has experienced several episodes of undulating and swaying in the coastal winds. TranSystems / Lichtenstein designed a deck replacement to : increase the bridges's load capacity, maintain its aerodynamic performance, and be constructed with minimal interruption to traffic.

IBC 08-93 - Rehabilitation of the Historic Elm Street Truss Bridge Using an Innovative Disassembly Construction Technique
Michael Marks, PE, EIC Group LLC, Fairfield, NJ; Michael Seelman, PE, Ferreira Construction Company Inc, Branchburg, NJ; Scott Patterson, PE, Acrow Corporation of America, Parsippany, NJ

This historic lenticular truss was rehabilitated by completely dismantling and then re-assembling utilizing an Acrow prefabricated bridge to temporarily support the structure during construction. Load was transferred to the Acrow by jacking hangers attached to the truss verticals. Load testing confirmed the r-assembled truss was carrying load as predicted.

IBC 08-94 - Design of the Suspender Rope Replacement at the Twin Arches Carrying I-87 over the Mohawk River, Albany, NY
Ramesh Panchalan, PhD, Michael Mangione, PE, Chas. H. Sells, Inc., Briarcliff Manor, NY

After 47 years of service, the suspender strands that support the Thaddeus Kosciusko Twin Arch Bridges carying Interstate i-87 (North Bound and South Bound) between the towns of Colonie in Albany County and Halfmoon in Saratoga County required replacement. The arches with the suspender strands support the built up floor beams, rolled stringer sections and a reinforced deck. This paper will breifly discuss the material and detail alternatives that were evaluated for replacing the suspender strands and connection assemblies including various alternatives to temporarily support the floorbeam ends during strand replacement. The paper will also briefly discuss the strand replacement procedure, design criteria, construction staging, strand replacement sequencing, maintenance and protection of traffic and maintenance measures recommended to prevent future corrosion of the suspender strands.

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