Analysis of Impact Loads from Full-Scale, Low-Velocity, Controlled Barge Impact Experiments, December 1998

Abstract : In 1993, Headquarters, U.S. Army Corps of Engineers, issued the first formal Corps-wide analysis procedure providing guidance for analyzing the effects of barge impact loading on navigation structures. According to the engineering procedure of Engineer Technical Letter (ETL) 1110-2-338, the magnitude of the impact forces generated by a particular collision event is dependent on the mass (including hydrodynamic added mass of the barge flotilla), the approach velocity, the approach angle, the barge flotilla moment of inertia, damage sustained by the barge structure, and friction between the barge and the wall. The analytical method uses the structural interaction mechanism of Minorsky, which provides an empirical relationship between the (nonrecoverable) hull deformation and the energy absorbed in a collision. The relationship between kinetic energy lost in a collision and the volume of in-plane (barge) material damaged is used to determine impact force as a relationship to instantaneous contact area of damaged structure.

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