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Implementation of Crash Simulation Technology To Develop Countermeasures Strategies for Overheight Impact Protection System on Concrete Girders
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2022-01-25
[PDF-6.54 MB]
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Edition:Final Report
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Abstract:Based on the 2016 National Bridge Inventory (NBI) database available at the FHWA, there are a total of 614,387 bridges in the United States. It has been observed from previous research that collision, both caused by vessel and vehicles, is the second leading cause of bridge failures. Recently, overheight impact on bridge superstructure has been recognized as a serious problem across the country. However, there is no standard design or knowledge base on the overheight impact demand that can be used by engineers to design the protection systems for bridge girders. The effectiveness of current retrofit approaches, such as carbon-fiber reinforced polymers (CFRP) wrapping, for pre-stressed concrete girders damaged during overheight impact, has not been systematically studied. Hence, the objective of the proposed research was to use crash simulation technology for developing a comprehensive approach for the demand model and performance-based design of supplemental protection beams. The efficacy of wrapping concrete girders with CFRP for protection against significant damage by overheight impact was also evaluated in detail. To minimize damage to fascia girders, energy-absorbing materials, such as aluminum honeycombs, have been proposed to be installed in front of the girder or sacrificial beams. The effectiveness and capabilities of these supplemental systems in protecting pre-stressed fascia girders of bridges were investigated through high fidelity computational simulation and scaled drop-hammer tests.
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