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Route 139 rehabilitation : Pulaski Skyway contract 2 : final report.
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2017-06-01
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[PDF-10.35 MB]
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Abstract:After being outside and exposed to the elements during many years of service, concrete and the reinforcement within begins to deteriorate and corrode, which affects the performance of concrete bridge balustrades, especially those built in the 1930’s and 1940’s. Many of these old concrete balustrades are approaching the end of their design service lives. The Historic Preservation Office is trying to replace an important historical concrete balustrade on NJ Route 139/Hoboken Viaduct in Jersey City, Hudson County while retaining the historic appearance. At the same time, the new design must also satisfy the requirements of the target level crash test of AASHTO MASH TL-4 which was adopted by the FHWA on January 1, 2011. In this study, the research team provides the open-faced balustrade design that will meet the aesthetic and safety requirements of both HPO and FHWA. The team incorporated the following four components: (1) Work/Coordinate with NJDOT and HPO to further develop the initial design alternative along with plans, specifications, and other appropriate documents. (2) Develop a detailed Finite Element (FE) model using LS-DYNA Software for crash test simulation. (3) Conduct a parametric study using the developed FE model to optimize the initial design alternative and evaluate the effects of various parameters on the overall performance of the concrete balustrade. Based on the simulation results, the team modified, enhanced, and optimized the initial design alternative and is attempting to obtain FHWA’s approval of the optimized design alternative. The team has coordinated with the crash testing facility, Texas A&M Transportation Institute (TTI) for the actual crash testing at test level 4 (TL-4) in accordance with AASHTO MASH. The barrier has been successfully crash tested, and the computer simulations have been validated. The outcome of this research is an optimized open balustrade design that meets the design safety and aesthetic criteria for AASHTO and HPO, respectively, as well as the crash test requirements for FHWA. The optimized deign will not only enable the New Jersey Department of Transportation (NJDOT) to use the HPO approved design in the Route 139 Rehabilitation project, but also enable NJDOT to replace other similar historic barriers while avoiding, or at least mitigating, the adverse effects to similar historic bridges.
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