1、August 2009 Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、77.140.15!$+%“1560802www.din.deDDIN 488-4Reinforcing steels Welded fabricEnglish translation of DIN 488-4:2009-08Betonstahl BetonstahlmattenEnglische bersetzung von DIN 488-4:2009-08Aciers pour bton arm Treillis soudsTraduction anglaise de DIN 488-4:2009-08Together with DIN 488-3:2009-08 supersedesD
3、IN 488-4:1986-06www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.100 .107 DIN 488-4:2009-08 A comma is used as the decimal marker. Contents Page Foreword. 3 1 Scope . 4 2 Normative references . 4 3 Terms and definitions 4 4 Symbols
4、. 5 5 Designation and ordering 6 5.1 Designation . 6 5.2 Ordering. 6 6 Requirements 7 6.1 Manufacturing processes 7 6.1.1 General. 7 6.1.2 Manufacturing processes for welded fabric 8 6.2 Properties 8 6.2.1 Properties in the tensile test 8 6.2.2 Shear resistance of the welded joints 8 6.2.3 Propertie
5、s in the fatigue test . 8 6.2.4 Bend performance 8 6.2.5 Bend test on the weld. 8 6.3 Dimensions and masses 9 6.3.1 Nominal diameters, nominal cross-sectional areas and nominal masses . 9 6.3.2 Form and dimensions of the sheets of fabric 9 6.4 Surface geometry 10 7 Identification of the products 10
6、8 Proof of conformity. 10 2 DIN 488-4:2009-08 Foreword DIN 488-4:2009-08 has been prepared by Working Committee NA 021-00-03 AA Normung von Betonstahl und Spannstahl of the Normenausschuss Eisen und Stahl (FES) (Iron and Steel Standards Committee). Amendments The following amendments have been made
7、to DIN 488-4:1986-06: a) All information on reinforcing wire has been deleted (refer now to DIN 488-3). b) Reinforcing steel made of steel grades B500A (1.0438) and B500B (1.0439) have been included. c) Steel grade BSt 500M (1.0466) has been deleted. d) Identification and ordering examples have been
8、 amended. e) The standard has been editorially revised. Previous editions DIN 488-4: 1972-04, 1986-06 3 DIN 488-4:2009-08 1 Scope This standard specifies the technical delivery conditions and mechanical and geometric properties of weldable ribbed reinforcing steel made of steel grades B500A und B500
9、B, used in the form of welded fabric for the reinforcement of concrete structures. The specific requirements for steel grades B500A (1.0438) and B500B (1.0439) used for the manufacture of welded fabric are covered by DIN 488-1 to DIN 488-3. 2 Normative references The following referenced documents a
10、re indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN 488-1:2009-08, Reinforcing steel Grades, properties, marking DIN 488-2, Reinforci
11、ng steel Part 2: Reinforcing steel bars DIN 488-3, Reinforcing steel Part 3: Reinforcing steel in coils, steel wire DIN 488-6, Reinforcing steel Part 6: Assessment of conformity DIN EN ISO 15630-2, Steel for the reinforcement and prestressing of concrete Test methods Part 2: Welded fabric 3 Terms an
12、d definitions For the purposes of this document, the terms and definitions in DIN 488-1 and DIN 488-6 and the following apply. 3.1 standard welded fabric welded fabric manufactured according to specified delivery conditions and available ex stock 3.2 purpose made welded fabric welded fabric manufact
13、ured according to the specific requirements of the customer 3.3 longitudinal bar reinforcing steel in the manufacturing direction of the welded fabric 3.4 transverse bar reinforcing steel perpendicular to the manufacturing direction of the welded fabric 3.5 twin bars two bars of the same steel grade
14、 and same nominal diameter placed adjacently in a welded fabric so as to be in contact with each other as a pair 3.6 pitch of welded fabric centre-to-centre distance of bars in a sheet of welded fabric NOTE With twin bars, the pitch is measured between the common main centrelines. 4 DIN 488-4:2009-0
15、8 3.7 overhang u1, u2, u3, u4length of longitudinal or transverse bars projecting beyond the centreline of the outer crossing bar in a sheet of welded fabric NOTE In a sheet of welded fabric with twin bars, the overhang is measured from the common main centreline. 3.8 length of a welded fabric sheet
16、 L longest side of a sheet of welded fabric, irrespective of the manufacturing direction 3.9 width of a welded fabric sheet B shortest side of a sheet of welded fabric, irrespective of the manufacturing direction 4 Symbols See Table 1. Table 1 Symbols Symbol Unit Description Anmm2Nominal cross-secti
17、onal area Bmm Length of transverse bars (width of welded fabric sheet) d mm Nominal diameter of bar dcmm Nominal diameter of transverse bars dLmm Nominal diameter of longitudinal bars dmaxmm Nominal diameter of thickest bar dminmm Nominal diameter of crossing bar dsmm Nominal diameter of single bars
18、 drmm Nominal diameter of twin bars D mm Mandrel diameter FsN Shear force of welded joints in welded fabric L mm Length of longitudinal bars (length of a welded fabric sheet) Pcmm Pitch of transverse bars PLmm Pitch of longitudinal bars ReMPaaYield strength u1, u2mm Overhang of longitudinal bars u3,
19、 u4mm Overhang of transverse bars a1 MPa = 1 N/mm2. 5 DIN 488-4:2009-08 5 Designation and ordering 5.1 Designation The products covered by this part of DIN 488 shall be designated in the following order: a) designation of the product form (welded fabric); b) number of this Part of DIN 488; c) name o
20、r number of the steel grade (see DIN 488-1:2009-08, Table 2); d) nominal dimensions of the product (dimensions of the bars, dimensions of the sheet of welded fabric, pitch of the bars, overhangs). NOTE Brief designations are widely used to describe standard welded fabric. The corresponding standard
21、welded fabric structure can be taken from tables issued by the manufacturer. Purpose-made welded fabric can be described as shown in Figure 1 or by a fully dimensioned drawing and should be identified by the users reference. Designation example: Welded fabric according to this Part of DIN 488 of ste
22、el grade B500B with longitudinal bars 12 mm in diameter and transverse bars 8 mm in diameter with a pitch of 125 mm, with 2 edge bars 10 mm longitudinal and 7 mm transverse: Welded fabric DIN 488-4 B500B 125 12/10-2/2-125 8/7-2/2 5.2 Ordering When ordering welded fabric, the procedure shall take int
23、o account the standard designation in 5.1 and the following example: Example of an order for 48 sheets of welded fabric of steel grade B500A with the standard designation according to 5.1 with L = 5,50 m, u1= 125 mm, u2= 125 mm, B = 2,45 m, u3= 25 mm, u4= 25 mm, twin longitudinal bar 8,0 mm, PL= 150
24、 mm, on the left-hand side 3 edge bars 8,0 mm with PL= 150 mm, on the right-hand side 3 edge bars 8,0 mm with PL= 150 mm, transverse bar 8,0 mm, Pc= 250 mm, start of welded fabric sheet 4 bars 6,0 mm with Pc= 250 mm, end of welded fabric sheet 4 bars with Pc= 250 mm: 48 welded fabric sheets DIN 488-
25、4 B500A 150 8,0d/8,0 3/3 5,50 125/125 250 8,0 /6,0 4/4 2,45 25/25 6 DIN 488-4:2009-08 Key PLpitch of the longitudinal bars Pcpitch of the transverse bars L length of the longitudinal bars B length of the transverse bars u1overhang of the longitudinal bars u2overhang of the longitudinal bars u3overha
26、ng of the transverse bars u4overhang of the transverse bars Figure 1 Geometric characteristics of welded fabric 6 Requirements 6.1 Manufacturing processes 6.1.1 General See DIN 488-1:2009-08, 7.1.1, 7.1.3 and 7.1.4. 7 DIN 488-4:2009-08 6.1.2 Manufacturing processes for welded fabric Welded fabric of
27、 ductility class A can be manufactured from ribbed reinforcing steel of steel grade B500A and material number 1.0438 and/or of reinforcing steel of steel grade B500B and material number 1.0439 according to DIN 488-1 to DIN 488-3. Welded fabric of ductility class B shall be manufactured from reinforc
28、ing steel of steel grade B500B and material number 1.0439 according to DIN 488-1 to DIN 488-3. All welded fabric shall be factory made and machine welded. The joints at the intersection of the longitudinal bars and transverse bars shall be made by electrical projection welding (electrical resistance
29、 spot welding) to provide a shear force meeting the requirements of 6.2.2. The specified welding ratios shall be noted (see 6.3.2.4). Bars in only one direction (longitudinal or transverse) may be twin bars. 6.2 Properties 6.2.1 Properties in the tensile test See DIN 488-1:2009-08, Table 2. 6.2.2 Sh
30、ear resistance of the welded joints Welded joints in welded fabric shall be able to withstand a shear force Fsof at least 0,25 Re Anbefore fracture, where Reis the specified characteristic yield strength (500 MPa) and An(in mm2) is the nominal cross-sectional area of either a) the thicker bar at the
31、 intersection in single bar welded fabric, or b) one of the twin bars in twin bar welded fabric. The test shall be conducted according to DIN EN ISO 15630-2. For the quantile according to DIN 488-1:2009-08, Table 2, row 12, 0,30 Re Anapplies. 6.2.3 Properties in the fatigue test See DIN 488-1:2009-0
32、8, Table 2. The specimen shall have at least one welded intersection in the gauge length. The thinner bar shall be tested. 6.2.4 Bend performance The suitability for bending of welded fabric shall be characterized by the behaviour of the initial products in the rebend test (see DIN 488-2 and DIN 488
33、-3). NOTE Bending the weld is not permitted when using welded fabric. 6.2.5 Bend test on the weld The bend test on the weld shall be conducted on the thicker bar. The mandrel diameter D is 6 dsand the bending angle 60o. After the test, the test piece shall show no signs of fracture. Small cracks in
34、the weld shall be disregarded. 8 DIN 488-4:2009-08 6.3 Dimensions and masses 6.3.1 Nominal diameters, nominal cross-sectional areas and nominal masses See DIN 488-1:2009-08, Table 3. With regard to exceeding or falling short of the nominal cross-sectional area, see DIN 488-1:2009-08, Table 2. The to
35、lerance applies to the individual bars. 6.3.2 Form and dimensions of the sheets of fabric 6.3.2.1 General Each sheet of welded fabric shall have the minimum number of bars corresponding to the required dimensions for length, width, pitch and overhang. A sheet of fabric from which no more than one sa
36、mple has been taken shall not be rejected for this reason. 6.3.2.2 Diameter of the bars The sheets of fabric shall be manufactured from bars with the nominal diameters given in DIN 488-1:2009-08, Table 3. 6.3.2.3 Arrangement of the bars The bars in an individual sheet of fabric shall be single and/o
37、r twin bars (in one direction only). 6.3.2.4 Ratio of the bar diameters 6.3.2.4.1 Sheets of fabric with single bars The diameters of the bars shall meet the following requirement: dmin 0,57 dmaxwith ds 8,5 mm and dmin 0,7 dmaxwith ds 8,5 mm where dmaxis the nominal diameter of the thickest bar; dmin
38、is the nominal diameter of the crossing bar; dsis the nominal diameter of the individual bars. Deviating diameter ratios are not permitted. 6.3.2.4.2 Sheets of fabric with twin bars in one direction The diameters of the bars shall meet the following requirement: 0,7 ds dr 1,25 ds9 DIN 488-4:2009-08
39、10 where dsis the nominal diameter of the individual bars; dris the nominal diameter of the twin bars. Deviating diameter ratios are not permitted. 6.3.2.5 Pitch and overhang The pitch of longitudinal bars (PL) and transverse bars (PC) shall not be less than 50 mm (see 3.6 and Figure 1). With twin b
40、ars, the centre-to-centre distance shall not be less than 100 mm. NOTE The overhang (u1, u2, u3, u4) should not be less than 25 mm (see 3.7 and Figure 1). 6.3.2.6 Dimensions of the sheets of fabric The nominal length, width and pitch of the bars and the nominal overhangs of the sheets of fabric shal
41、l be agreed at the time of enquiry and order. 6.3.2.7 Limit deviations for welded fabric The limit deviations for welded fabric are as follows: length and width: 25 mm or 0,5 %, whichever is greater; bar pitch: 15 mm or 7,5 %, whichever is greater; overhangs: to be agreed at the time of enquiry and
42、order. Special requirements in respect of limit deviations can be agreed between the manufacturer and the customer. 6.4 Surface geometry The products according to this Part of DIN 488 shall have a ribbed surface. The requirements of DIN 488-1 to DIN 488-3 apply. 7 Identification of the products The products shall be identified according to DIN 488-1:2009-08, clause 8. 8 Proof of conformity Proof of conformity to the requirements of this standard shall be provided as specified in DIN 488-6.
