One worker was killed and a co-worker was seriously injured when the tower climbing work platform they were working from collapsed sending them plummeting 85 feet to the ground below. A third worker managed to escape injury by leaping over the parapet onto the building’s roof. The workers were removing water table stone from the roof façade of an eight story building when the accident occurred. A bay window protrusion extending the full eight stories of the building hindered worker access to the building directly from the central work platform. Cantilever extensions had been bolted to the central work platform to accommodate the bay window protrusion.
Rapperport Associates was engaged to determine the cause of the failure. Finite element stress and buckling analyses were conducted and verified with full scale testing. It was determined that the structure failure by buckling and not as a result of weld failure.Return to Case Studies