scope:

This part of ISO 8686 establishes general methods for calculating loads, and principles to be used to select load combinations for proofs of competence for the structural and mechanical components of cranes as defined in ISO 4306-1.

It is based on rigid-body kinetic analysis and elasto-static analysis but it expressly permits the use of more advanced methods (calculations or tests) to evaluate the effects of loads and load combinations, and the values of dynamic load factors, where it can be demonstrated that these provide at least equivalent levels of competence.

This part of ISO 8686 is intended for two distinct kinds of application:

a) It provides the general form, content and ranges of parameter values for more specific standards to be developed for individual lifting appliance types.

b) It provides a framework for agreement on loads and load combinations between a designer or manufacturer and an appliance purchaser for those types of lifting appliances where specific standards do not exist.

When applying this part of ISO 8686 to different types of lifting appliance, operating in the same service and environmental conditions, equivalent resistance to failure should be sought.