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Published: November 2010      

Cranes feel the strain

Oakland (CA)-based Liftech Consultants, Inc has been investigating fatigue cracks in container cranes since 1964. Recently its engineers have been noticing a new set of problems.

In the mid-1990s Liftech was discussing fatigue cracking in pipe truss booms on cranes that were typically 20 years old. But structural engineer and VP Jonathan Hsieh says that today the company is seeing fatigue cracks much earlier in three key areas: the crane portal, the gantry equalizer beams, and under-hung crane trolleys....


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