AS 5222:2021 pdf free.Cranes – 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.
3.1 In-service wind
maximum wind that the crane is designed to withstand under operating conditions
3.2 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
4 Wind pressure
The wind pressure, p. is given by the formula
pzrO,Sxpxv (1)
where
p is the density of air which, for design purposes, is assumed to be constant p = 1.225 kg/rn3 v5 is the wind speed, used as a basis of the calculation.
When using the international system of units (SI), where p is expressed in N/rn2 and v in metres per second (m/s), the following applies:
p=O.625xv (2)
5 In-service wind
5.1 General
The wind loading shall be applied in the least favourable direction in combination with the appropriate loads as defined in ISO 8686-1:2012, load combinations B and C.
In-service design wind speeds and corresponding pressures shall be either selected based on Table 2 or specified based on the crane configuration, application and the wind conditions. The in-service design wind speed shall be documented in the operating manual of the crane.AS 5222 pdf download.