United States Department of Transportation
i
Protecting Critical Civil Infrastructure Against Impact from Commercial Vehicles - Phase I, Year 2
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2024-09-01
[PDF-1004.92 KB]
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Edition:February 2019 – September 2021
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Abstract:Pier columns are often not adequately designed to resist vehicle collisions and blasts. This research aimed to enhance the durability of bridge piers and columns exposed to both vehicle impacts and air blasts. A prototypical bridge pier, including its foundation, was analyzed. Three-dimensional LS-DYNA models were created for circular reinforced concrete (RC) columns and piers, along with their footings and piles. Vehicle impacts were simulated using a Ford F800 truck, while air blasts of varying intensities were modeled. The models were validated using data from previous impact and blast tests. Parametric studies assessed how design variables affected performance, and damage indices were developed by comparing the residual load-bearing capacity of damaged columns to their original strength. Retrofit methods, such as applying FRP wraps and polyurea coatings, were evaluated for their effectiveness in improving blast and impact resistance. The study also involved coordinating with the Nebraska State Patrol (NSP) to acquire information about explosives (TNT) that could be used to simulate or, potentially, complete future air blast tests of structural materials and components. Appropriate data collection methods were selected, and an enhanced impact testing approach using a beam geometry of 10 x 10 x 30 cm was introduced. In lieu of air blast tests, impact tests were conducted to evaluate material behavior under dynamic loading conditions.
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