Sinking of a Floating Dock & Wave Attenuator

Truss Connection Failure

Truss Connection Failure

Floating Dock & Attenuator

Floating Dock & Attenuator

Reversing Stress Joint Failures

Reversing Stress Joint Failures

During an unusually violent summer storm on an inland lake, a 250 ft. by 50 ft. floating dock and wave attenuator broke-up and sunk after hours of battering by waves and wind. Following the sinking, a professional dive company was hired to video and then raise the underwater wreck for a cause and origin investigation.

Liebert Engineering, Inc.,  was hired by the Owner’s insurance company to inspect the wreck, conduct a cause and origin investigation, and determine probable costs to repair and re-launch, or scrap and replace the attenuator. Based on video recordings of the floating assembly during the storm, physical examination of the wreck, review of design and installation drawings, we determined the initial failure occurred at the circumferential welded connections between the cylinders and flange plates. The connections failed because the entire structure was rigid and had no flex-joints for resisting wave and wind forces.


© 2011 Liebert Engineering • Web Design + Development | Eternity Web