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|Title:||Analysis of impact loads from full-scale, low-velocity, controlled barge impact experiments, December 1998|
|Authors:||University of Puerto Rico (Mayagüez Campus). Department of General Engineering.|
Innovations for Navigation Projects Research Program (U.S.)
Arroyo, José Ramón.
Ebeling, Robert M., 1954-
Barker, Bruce C.
Impulse and linear momentum
|Publisher:||Information Technology Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||ERDC/ITL TR 03-3.|
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. Two significant concerns have been raised since the ETL 1110-2-338 procedure was released. First, a key aspect of the ETL 1110-2-338 engineering formulation is computation of collision energy dissipated in nonrecoverable, plastic hull deformation of (i.e., damage to) the corner of the barge where impact with the wall occurs. However, the majority of the impacts made by barge flotillas transiting Corps locks do not result in damage to the barge structure or to the walls. Second, several engineers who have used the ETL 1110-2-338 engineering procedure have questioned the accuracy of the computed results. This report addresses the interpretation of eight of the 44 December 1998 full-scale, low-velocity controlled impact, barge flotilla impact experiments conducted at the decommissioned Gallipolis Lock at Robert C. Byrd Lock and Dam. An easy to use empirical correlation is derived that reports the maximum impact force (normal to the wall) as a function of the linear momentum normal to the wall (immediately prior to impact), using the results from the impact forces measured during these full-scale impact experiments. This new empirical correlation will be used for impacts that do not involve damage during impact to either the corner barge of a barge flotilla or to the wall. An alternate empirical correlation is given for the maximum impact force (normal to the wall) as a function of the kinetic energy normal to the wall (immediately prior to impact).
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