We are no strangers to cranes towering over our city landscapes, but how can we ensure they will not collapse when an earthquake strikes?
The new ISO 11031 can be used to calculate seismic loads, and sets out design principles for cranes destined to work in seismically active regions and for cranes required to be seismically resistant.
Klaus Pokorny, Secretary of the ISO subcommittee working on design principles and requirements for cranes, explains: “To make sure that cranes are safe, we first need to calculate the seismic loads that show how a crane will respond in moderate to severe earthquakes. Then you can use design limit states provided in two forms: serviceability limit and ultimate limit.”
ISO 11031 was developed at the request of Japan who, following the 1995 earthquake in Kobe, emphasized the need for a standard to ensure seismic-resistant cranes. The secretariat of the subcommittee that developed the standard is held by DIN, the ISO member for Germany.
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