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ISO DIS 11031

.2 Edition, January 15, 2015

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Superseded By: ISO 11031

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Description / Abstract:

This standard establishes general methods for calculating seismic loads to be used in proofs of competence as defined in ISO 8686-1 for the structural and mechanical components of cranes as defined in ISO 4306-1 with the exception of mobile cranes.

This standard evaluates dynamic response behaviour of a crane subjected to seismic excitation as function of the dynamic characteristics of the crane and of its supporting structure.

The evaluation takes into account dynamic effects both of regional seismic conditions and of the local conditions on the surface of the ground at crane location.

In addition, the operational conditions of the crane and the risks resulting from seismic damage to the crane are also taken into account

An economically acceptable protection against the effects of earthquake is usually based on two design limit states which specify the required crane response to a moderate and a severe earthquake and which are expressed in terms of Serviceability and Ultimate Limit States

— Serviceability limit state (SLS) imposes that the crane should withstand moderate earthquake ground motions which may occur at the site during its service life. The resulting stresses would remain within the accepted limits.

— Ultimate limit state (ULS) imposes that the crane structure should not collapse nor experience similar forms of structural failure due to severe earthquake ground motions, the suspended load or any part of the crane should not fall and the safety of the public, operators and workers should be safe guarded. The crane is not expected to remain operational after the earthquake. However, in the case of a failure in the main load path, it shall be possible to lower the load to the ground after the earthquake.

At present this standard does not make such distinction and uses limit states of ISO 20332, with stresses remaining within the elastic range. It does not extend to proofs of competence which include plastic deformations. When plastic deformations are permitted by agreement between the crane supplier and customer, other standards or relevant literature taking them into account should be used instead.
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