AS 5224 pdf download

AS 5224 pdf download.Cranes — Proof of competence of steel structures (ISO 20332:2016, MOD)
1 Scope
This International Standard sets forth general conditions, requirements, methods, and parameter values for performing proof-of-competence determinations of the steel structures of cranes based upon the limit state method. It is intended to be used together with the loads and load combinations of the applicable parts of ISO 8686. This International Standard is general and covers cranes of all types. Other International Standards can give specific proof-of-competence requirements for particular crane types. Proof-of-competence determinations, by theoretical calculations and/or testing, are intended to prevent hazards related to the performance of the structure by establishing the limits of strength, e.g. yield, ultimate, fatigue, and brittle fracture. According to ISO 8686-1 there are two general approaches to proof-of-competence calculations: the limit state method, employing partial safety factors, and the allowable stress method, employing a global safety factor. Though it does not preclude the validity of allowable stress methodology, ISO 20332 deals only with the limit state method. Proof-of-competence calculations for components of accessories (e.g. handrails, stairs, walkways, cabins) are not covered by this International Standard. However, the influence of such attachments on the main structure needs to be considered.
4 General
4.1 General principles Proof-of-competence calculations shall be done for components, members, and details exposed to loading or repetitive loading cycles that could cause failure, cracking, or distortion interfering with crane functions. NOTE See ISO 8686 for further information applicable to the various types of crane. Not all calculations are applicable for every crane type. . 4.2 Documentation The documentation of the proof-of-competence calculations shall include the following: design assumptions including calculation models; applicable loads and load combinations; material properties; – – weld quality classes in accordance with ISO 5817; – properties of connecting elements; relevant limit states; 一results of the proof-of-competence calculations and tests when applicable. 4.3 Alternative methods The competence may be verified by experimental methods in addition to or in coordination with the calculations. The magnitude and distribution of loads during tests shall correspond to the design loads and load combinations for the relevant limit states. Alternatively, advanced and recognized theoretical or experimental methods generally may be used, provided that they conform to the principles of this International Standard. 4.4 Materials of structural members It is recommended that steels in accordance with the following International Standards be used: ISO 630; – ISO 6930-1; ISO 4950-1; – ISO 4951-1, ISO 4951-2, and ISO 4951-3. Where other steels are used, the specific values of strengths fu and fy shall be specified. The mechanical properties and the chemical composition shall be specified in accordance with ISO 404. Furthermore, the following conditions shall be fulfilled: 一the design value of fy shall be limited to fu/ 1,05 for materials with fu/fy < 1,05; -the percentage elongation at fracture on a gauge length  (where So is the original cross-sectional area); the weldability or non-weldability of the material shall be specified and, if intended for welding, weldability demonstrated; -if the material is intended for cold forming, the pertinent parameters shall be specified. To allow the use of nominal values of plate thicknesses in the proof calculations, the minus tolerance of the plate shall be equal or better than that of class A of ISO 7452:2013. Otherwise, the actual minimum value of plate thickness shall be used. When verifying the grade and quality of the steel (see referenced International Standards) used for tensile members, the sum of impact toughness parameters, qi;, shall be taken into account. Table 2 gives qi for various influences. The required impact energy/test temperatures in dependence of > q; are shown in Table 3 and shall be specified by the steel manufacturer on the basis of ISO 148-1.