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2. ASTM(2003).Standard specification for steel strand uncoated seven‐wire for pre‐stressed concrete. A421/A416M‐01 West Conshohocken PA.
3. ASTM (2003). Standard specification for steel strand uncoated seven‐wire for pre‐stressed concrete. A416/A416M‐01 West Conshohocken PA.
4. AS/NZS 4672. (2007)StandardsAustralia New Zealand.Prestressing strand standard. Wellington NZ.
5. GBT‐5224. (2003)Steel strand for pre‐stressed concrete. National Administration of Construction China. (in Chinese)