http://www.steel.org/AM/AMTemplate.cfm?Section=PDFs1&Template=/CM/ContentDisplay.cfm&ContentFileID=1562#search=%22North%20American%20Specification%20for%20the%20Design%20of%20Cold-Formed%20Steel%20Structural%20Members%22
和
http://www.ce.jhu.edu/bschafer/direct_strength/2004-01-Spec/190B_fnl_A.pdf#search=%22North%20American%20Specification%20for%20the%20Design%20of%20Cold-Formed%20Steel%20Structural%20Members%22
都是pdf格式
参考ASMI标准