I have to check a bulkhead for the impact of debris based upon section 22.214.171.124 in ASCE 7 - 98 edition and a 1 kip object. I specifically have a question regarding the last statement of that section. It states, "It shall be assumed that the velocity of the object is reduced to 0 in 1 sec." If I make this assumption with the wave speed provided (approx. 25 ft/sec), the deflection to allow for the object to come to rest over a full second is not practical. I am attempting to use a conservation of energy approach to determine the actual force based upon some assumed deflections, but the forces are getting extremely high. Has anyone had experience with this analysis and are there any other references I could use for help? Thank you.
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