Noriega-Negrón, Anthony
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Publication Impulse load response of lattice steel columns(2012) Noriega-Negrón, Anthony; Suárez, Luis E.; College of Engineering; Crane, Charles K.; López, Ricardo R.; Acosta, Felipe J.; Department of Civil Engineering; Schmidt, JorgeMany bridges that represent an important part of our nation’s infrastructure system are constructed from steel components including steel plates, beams, columns, and cables of different configurations. Because of their importance, they could be used as targets for terrorist attacks, in particular by means of explosives. It is therefore essential to assess the vulnerability of bridge steel components to the effects of explosions, and to develop effective mitigation measures that minimize their effects. The objective of this research is to study the response to an explosive load of a double laced steel column salvaged from a New York bridge. Two modern columns designed to have an equivalent capacity one with a wide-flange section and another with a perforated box shape were also studied. In order to investigate the effects of blast loads on the bridge columns, high-fidelity finite element models were developed using ABAQUS. The bridge columns were subjected to a time-pressure load as a result of a detonation. Three scenarios for the detonation were established based on a scaled range, z: Low-1, Medium-0.65 and High-0.35. These loads were applied to the two perpendicular sides of the three columns. Two boundary condition scenarios were also considered, fixed and hinged at both ends. The displacements, deformed shapes, von Mises stresses, and plastic strains were examined to evaluate the behavior of the three columns. The results of the numerical simulations show that the double laced column exhibits the best performance. The response predicted by the numerical models will assist in the design of future experimental tests.