tailieunhanh - Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete

"Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete" covers two grades of low-relaxation, seven-wire steel strand for use in prestressed concrete construction. Grade 250 [1725] and Grade 270 [1860] have minimum tensile strengths of 250 ksi [1725 MPa] and 270 ksi [1860 MPa], respectively, based on the nominal area of the strand. | Designation A416 A416M 16 Standard Specification for Low-Relaxation Seven-Wire Steel Strand for Prestressed Concrete1 This standard is issued under the fixed designation A416 A416M the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the . Department of Defense. 1. Scope Grade 270 1860 Uncoated Used in Prestressed Ground This specification covers two grades of low-relaxation Anchors seven-wire steel strand for use in prestressed concrete con- A1061 A1061M Test Methods for Testing Multi-Wire Steel struction. Grade 250 1725 and Grade 270 1860 have Strand minimum tensile strengths of 250 ksi 1725 MPa and 270 ksi . Military Standard 3 1860 MPa respectively based on the nominal area of the MIL-STD-129 Marking for Shipment and Storage strand. . Federal Standard 3 Fed. Std. No. 123 Marking for Shipments Civil Agencies A supplementary requirement S1 is provided for use where bond strength testing of . diameter 3. Terminology Grade 270 1860 strand for applications in prestressed ground Definition of Term Specific to This Specification anchors is required by the purchaser. The supplementary strand n a group of wires having a center wire requirement applies only when specified in the purchase order. enclosed tightly by six helically placed outer wires with The text of this specification contains notes or footnotes uniform pitch of not less than 12 and not more than 16 times or both that provide explanatory material. Such notes and the nominal diameter of the strand. footnotes do not contain any mandatory information. Discussion The direction of lay may be either This specification is applicable for orders in either right- .