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Strength design in aluminum/Commentary on CSA S157-17, Strength design in aluminum
This Standard applies to limit state design, fabrication, erection, and inspection of aluminum alloy members and assemblies
When this Standard is referenced by other CSA Group standards (e.g., product standards), the requirements of this Standard apply as so specified in the referencing CSA Group standard. Note: Annex A lists some applications to which other standards apply
The use of other standards for the design, fabrication, erection, and/or inspection of members or parts of aluminum structures is neither warranted nor acceptable except where specifically directed in this Standard. The substitution of other standards or criteria for design, fabrication, erection, and/or inspection is expressly prohibited unless specifically directed in this Standard.
Where this Standard does not provide requirements for a specific situation, a rational design is to be used, based on appropriate theories, tests, analyses, or engineering experience. The design formulas provided in this Standard may be supplemented by such a rational design, provided that nominal margins (or factors) of safety are at least equal to those intended in the provisions of this Standard.
In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.
The expressions contained herein are dimensionally uniform, and any consistent system of units may be employed. Where dimensions are identified, SI units are used, typically newtons (N) for force, millimetres (mm) for length, and megapascals (MPa = N/mm2) for stress. -------------------------------------------------------------------------------------------------------------------------------
It supersedes the previous edition published in 2005. The purpose of this Commentary is to provide background on the design provisions of the Standard and thereby to help designers deal with issues not explicitly addressed in the Standard. It is also intended to document the research background on which the provisions are based, and to provide descriptive information to give the user an appreciation of the current approach to strength design in aluminum. It is to be used in conjunction with the Standard. The clause headings and numbers used in the Commentary refer to the identical clause headings and numbers in the Standard, but in the Commentary the clause numbers are given the prefix “C”. The Commentary contains cross-references to the Standard as well as cross-references within the Commentary. Several clauses in the Standard require no comment and hence no commentary is provided. In such instances, a gap in the numbering will appear at the appropriate locations in this Commentary. This Commentary on CSA S157 was prepared by the Commentary Subcommittee of the Technical Committee on Strength Design in Aluminum; however, it is not a consensus document
As it is referenced by the National Building Code of Canada, CSA S157 includes requirements that are specific to buildings, and the load and resistance factors given are for the design of building components. However, the design procedures determine the ultimate resistances of members and connections; thus, CSA S157 has general validity and is expected to be applied to all types of load- bearing aluminum assemblies where there is no other design standard. Aircraft design, pressure vessel design, and other well-established fields have their own bodies of rules. CSA S157 is aimed at general engineering, which includes such applications as lattice towers, cranes, vehicles, and rolling stock.
| SDO | CSA: Canadian Standards Association |
| Document Number | |
| Publication Date | Jan. 1, 2017 |
| Language | en - English |
| Page Count | 228 |
| Revision Level | |
| Supercedes | |
| Committee |