Scalable Response Prediction of Underwater Explosion Effects on Critical Infrastructure
Didoszak, Jarema M.
Loomis, Jean B.
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Critical port infrastructure is especially vulnerable to waterborne improvised explosive devices (IED) and other underwater explosions (UNDEX). These massive engineering structures such as bridges, tunnels and piers serve the public day in and day out providing transportation, commerce and connectivity throughout waterfront areas. In addition, they are fully integrated into society and serve as the visible backdrop for all sorts of recreational, social and ceremonial events in the port area. However this need for accessibility also makes them stand particularly vulnerable to the powerful effects of fluid structure interaction resulting from UNDEX.In response to these growing concerns, various security measures such as structural protection against ship collisions, heightened surveillance and physical barriers in close proximity to bridge abutments has been implemented. In some instances it is unclear that these changes have improved or actually degraded the overall survivability of the structure. The goal of this investigation is to analyze the resulting potential damage to critical port infrastructure subjected to near field UNDEX. Representative of the profound importance of our nation’s massive civil engineering structures, a suspension bridge is used as the object of theses analyses. Findings from physics-based modeling and simulation of the shock event reveal the damage potential of UNDEX as a function of charge weight and standoff distance, and serve as a template for future efforts for other bridge structures in direct contact with significant bodies of water.
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NPS Report NumberNPS-N16-N156-A