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1、 Reference number ISO 15630-2:2002(E) ISO 2002 INTERNATIONAL STANDARD ISO 15630-2 First edition 2002-04-15 Steel for the reinforcement and prestressing of concrete Test methods Part 2: Welded fabric Aciers pour larmature et la prcontrainte du bton Mthodes dessai Partie 2: Treillis souds ISO 15630-2:
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5、. ISO 2002 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in
6、 the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2002 All rights reserved ISO 15630-2:2002(E) ISO 2002 All rights reserved iii Contents Page Foreword.
7、iv Introduction.v 1 Scope1 2 Normative references1 3 Symbols2 4 General provisions concerning test pieces2 5 Tensile test.3 6 Bend test on welded intersection 4 7 Determination of the weld shear force (Fs).5 8 Axial load fatigue test8 9 Chemical analysis10 10 Measurement of the geometrical character
8、istics of the fabric.10 11 Test report11 ISO 15630-2:2002(E) iv ISO 2002 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried
9、 out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO
10、 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare Internation
11、al Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elem
12、ents of this part of ISO 15630 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 15630-2 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 16, Steels for the reinforcement and prestressing of concrete. This p
13、art of ISO 15630, together with parts 1 and 3, cancels and replaces ISO 10065:1990, ISO 10287:1992 and ISO 10606:1995. ISO 15630 consists of the following parts, under the general title Steel for the reinforcement and prestressing of concrete Test methods: Part 1: Reinforcing bars, wire rod and wire
14、 Part 2: Welded fabric Part 3: Prestressing steel -,-,- ISO 15630-2:2002(E) ISO 2002 All rights reserved v Introduction The aim of ISO 15630 is to provide all relevant test methods for reinforcing and prestressing steels in one standard. In that context, the existing International Standards for test
15、ing these products have been revised and updated. Some further test methods have been added. Reference is made to International Standards on testing of metals in general as they are applicable. Complementary provisions have been given if needed. Test methods which do not form the subject of an exist
16、ing International Standard on metal testing are fully described in ISO 15630. -,-,- -,-,- INTERNATIONAL STANDARD ISO 15630-2:2002(E) ISO 2002 All rights reserved 1 Steel for the reinforcement and prestressing of concrete Test methods Part 2: Welded fabric 1 Scope This part of ISO 15630 specifies tes
17、t methods applicable to welded fabric. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 15630. For dated references, subsequent amendments to, or revisions of, any of these publications do not
18、 apply. However, parties to agreements based on this part of ISO 15630 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of I
19、EC and ISO maintain registers of currently valid International Standards. ISO 4965:1979, Axial load fatigue testing machines Dynamic force calibration Strain gauge technique ISO 6892:1998, Metallic materials Tensile testing at ambient temperature ISO 7438:1985, Metallic materials Bend test ISO 7500-
20、1:1999, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system ISO 9513:1999, Metallic materials Calibration of extensometers used in uniaxial testing ISO/TR 9769:1991, Steel and iron
21、 Review of available methods of analysis ISO 15630-2:2002(E) 2 ISO 2002 All rights reserved 3 Symbols See Table 1. Table 1 Symbols Symbol Unit Description Reference A % Percentage elongation after fracture 5.1, 5.3 Ag % Percentage non-proportional elongation at maximum force (Fm) 5.3 Agt % Percentag
22、e total elongation at maximum force (Fm) 5 An mm2 Nominal cross-sectional area of the bar or wire 8.4.2 d mm Nominal diameter of the bar or wire 5.3, 7.2, 8.4.8 D mm Diameter of the mandrel of the bending device in the bend test on welded intersection 6.2.1 (Figure 2), 6.3 f Hz Frequency of load cyc
23、les in the fatigue test 8.1, 8.4.3 Fm N Maximum force in the tensile test 5.3 Fr N Force range in the axial load fatigue test 8.1, 8.3, 8.4.2, 8.4.3 Fs N Weld shear force Clause 7 Fup N Upper force in the axial load fatigue test 8.1, 8.3, 8.4.2, 8.4.3 r1 mm Distance between the grips and the gauge l
24、ength for the manual measurement of Agt 5.3 r2 mm Distance between the fracture and the gauge length for the manual measurement of Agt 5.3 ReH N/mm2 Upper yield strength 5.2, 5.3 Rm N/mm2 Tensile strength 5.3 Rp0,2 N/mm2 0,2 % proof strength, non-proportional extension 5.2, 5.3 Angle of bend in the
25、bend test on welded intersection 6.3 2a N/mm2 Stress range in the axial load fatigue test 8.4.2 max N/mm2 Maximum stress in the axial load fatigue test 8.4.2 NOTE 1 N/mm2 = 1 MPa. 4 General provisions concerning test pieces The test pieces shall be taken from the welded fabric in the as-delivered co
26、ndition. For the determination of the mechanical properties in the tensile test and the fatigue test, the test piece may be artificially aged depending on the requirements of the relevant product standard. NOTE When the product standard does not specify any ageing treatment, the following conditions
27、 may be applied: heating the test piece to 100 C, maintaining at this temperature 10 C for a period of 1 hour 15 0 min + and then free cooling in still air to the ambient temperature. -,-,- ISO 15630-2:2002(E) ISO 2002 All rights reserved 3 When an ageing treatment is applied to the test pieces, the
28、 conditions of the ageing treatment shall be stated in the test report. The test piece shall include at least one welded intersection. The number of welded intersections in the test piece shall be noted in the test report. Cross wires or bars and the wire or bar not to be tested in a twin wire or ba
29、r sample shall be cut off before the test without damaging the wire or bar to be tested or the weld under test. 5 Tensile test 5.1 Test piece In addition to the general provisions given in clause 4, the free length of the test piece shall be sufficient for the determination of percentage elongations
30、 in accordance with 5.3. When percentage elongation after fracture (A) is determined, the test piece shall be marked according to clause 8 of ISO 6892:1998. When percentage total elongation at maximum force (Agt) is determined by the manual method, equidistant marks shall be made on the free length
31、of the test piece (see annex H of ISO 6892:1998). The distance between the marks shall be 20 mm, 10 mm or 5 mm, depending on the bar or wire diameter. 5.2 Test equipment The testing machine shall be verified and calibrated in accordance with ISO 7500-1 and shall be at least of class 1. When an exten
32、someter is used it shall be of class 1 (see ISO 9513) for the determination of ReH or Rp0,2; for the determination of Agt, a class 2 extensometer (see ISO 9513) may be used. 5.3 Test procedure The tensile test shall be carried out in accordance with ISO 6892. For the determination of Rp0,2, if the s
33、traight portion of the force-extension diagram is limited or not clearly defined, one of the following methods shall be applied: the procedure recommended in 13.1 of ISO 6892:1998; the straight portion of the force-extension diagram shall be considered as the line joining the points corresponding to
34、 0,1 Fm and 0,3 Fm. In case of dispute, the second procedure shall be applied. NOTE The test should be considered invalid when the slope of this line differs by more than 10 % from the theoretical value of the modulus of elasticity. For the calculation of tensile properties (ReH or Rp0,2, Rm), the n
35、ominal cross-sectional area shall be used, unless otherwise specified in the relevant product standard. Where fracture occurs in the grips or at a distance from the grips of less than 20 mm or d (whichever is the greater), the test may be considered as invalid. For the determination of percentage el
36、ongation after fracture (A), the original gauge length shall be 5 times the nominal diameter (d), unless otherwise specified in the relevant product standard. -,-,- ISO 15630-2:2002(E) 4 ISO 2002 All rights reserved For the determination of the percentage total elongation at maximum force (Agt), ISO
37、 6892 shall be applied with the following modifications or complements: if Agt is measured by using an extensometer, Agt shall be recorded before the force has dropped more than 0,5 % from its maximum value; if Agt is determined by the manual method after fracture, Agt shall be calculated from the f
38、ollowing formula: gtgm/2 000 AAR=+ where Ag is the percentage non-proportional elongation at maximum force. The measurement of Ag shall be made on a gauge length of 100 mm at a distance, r2, of at least 50 mm or 2d (whichever is greater) away from the fracture. This measurement may be considered as
39、invalid if the distance, r1, between the grips and the gauge length is less than 20 mm or d (whichever is greater) (see Figure 1); in case of dispute, the manual method shall apply. a Grip length b Gauge length 100 mm Figure 1 Measurement of Agt by the manual method 6 Bend test on welded intersectio
40、n 6.1 Test piece The general provisions given in clause 4 apply. For welded fabric with single wires or bars in both directions, the thicker wire or bar shall be submitted to bending. For welded fabric with twin wires or bars, one of the twin wires or bars shall be submitted to bending. 6.2 Test equ
41、ipment 6.2.1 A bending device, the principle of which is shown in Figure 2, shall be used. NOTE Figure 2 shows a configuration where the mandrel and support rotate and the carrier is locked. It is also possible that the carrier rotates and the support or mandrel is locked. 6.2.2 The bend test may al
42、so be carried out by using a device with supports and a mandrel (see 4.1 of ISO 7438:1985). -,-,- ISO 15630-2:2002(E) ISO 2002 All rights reserved 5 Key 1 Mandrel 2 Support 3 Carrier 4 Crossing wire Figure 2 Principle of a bending device 6.3 Test procedure The bend test shall be carried out at a tem
43、perature between 10 C and 35 C. The test piece shall be bent over a mandrel so that the weld will be in the centre of the bent portion of the test piece and in the zone under tension. NOTE The bending rate should be about 60 /s. The angle of bend () and the diameter of the mandrel (D) shall be in ac
44、cordance with the relevant product standard. 6.4 Interpretation of test results The interpretation of the bend test shall be carried out according to the requirements of the relevant product standard. When these requirements are not specified, the absence of cracks visible to a person with normal or
45、 corrected vision is considered as evidence that the test piece has withstood the bend test. 7 Determination of the weld shear force (Fs) 7.1 Test piece The general provisions given in clause 4 shall apply. For welded fabric with single wires or bars in both directions, the thicker wire or bar shall
46、 be used as the pulling wire or bar. For welded fabric with twin wires or bars, one of the twin wires or bars shall be the pulling wire or bar. Test pieces previously subjected to tensile testing may be used for the weld shear test, provided that the necking at the fracture is clear of the weld zone
47、. -,-,- ISO 15630-2:2002(E) 6 ISO 2002 All rights reserved 7.2 Test equipment The tensile testing machine shall be verified in accordance with ISO 7500-1 and shall be of class 1 or better. The holder for the support of the test piece shall be of one of the following three types: type a: the cross wi
48、re or bar is simply supported by a smooth steel plate, with a slot for the pulling wire or bar. Neither the deflection of the pulling wire or bar nor the rotation of the cross wire or bar is prevented see Figure 3 a); type b: in addition to the provisions applicable to type a holders, the deflection of the tail of the pulling wire or bar is prevented, but not the rotation of the cross wire or bar. The tail of the pulling wire or bar is supported at a d