AS 5222:2021 Cranes一Wind load assessment (ISO 4302:2016, MOD).
AS 5222 specifies the assessment of wind loads on cranes.
It establishes general methods for calculating wind loads (for in-service and out-of-service conditions), which are included in the load combinations stated in ISO 8686-1 and used for proofs of competence such as those given in ISO 20332 for the structural components of cranes.
It provides a simplified method of calculation and assumes that
— the wind may blow horizontally from any direction,
— the wind blows at a constant speed,
— there is a static reaction to the wind load applied to the crane structure.
It includes built-in allowances for the effects of gusting (fluctuation in wind speed) and for dynamic response.
It gives guidance on when to secure the crane for out-of-service conditions.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 8686-1:2012, Cranes — Design principles for loads and load combinations — Part 1: General
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the following terms and definitions apply. The main symbols are given in Table 1.
in-service wind
maximum wind that the crane is designed to withstand under operating conditions
out-of-service wind
maximum (storm) wind blowing from the least favourable direction that a crane is designed to withstand when in an out-of-service condition
The wind speed shall be measured at the highest point of the crane. The in-service design wind speed in Table 2 is based on the premise that the crane can be fully secured in an out-of-service configuration before the design wind speed is exceeded. As the means for this securing vary by crane type and configuration, the time allowance (e.g. locking devices at special locations of the crane runway, hand- operated or automatic rail clamps) shall take this into account by a lower level of wind speed chosen to start the securing. Wind speeds for the use of different crane configurations and for the starting of securing shall be specified.
5.2 Action of in-service wind on suspended load
On all cranes, the action of the wind on the load must be taken into account and the method by which this is done shall be clearly described. This may be accomplished by use of wind loads on load parameters of size and shape. The wind load F11 on the load shall be calculated as a minimum as follows.AS 5222 pdf download.