1、August 2009 Translation by DIN-Sprachendienst.English price group 9No 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!$+(“1560805www.din.deDDIN 488-5Reinforcing steels Lattice girdersEnglish translation of DIN 488-5:2009-08Betonstahl GittertrgerEnglische bersetzung von DIN 488-5:2009-08Aciers pour bton arm Treilis r idisseursTraduction anglaise de DIN 488-5:2009-08www.beuth.deDocument comprises pagesIn ca
3、se of doubt, the German-language original shall be considered authoritative.140 .10l a7 DIN 488-5:2009-08 A comma is used as the decimal marker. Contents Page Foreword. 3 1 Scope . 3 2 Normative references . 3 3 Terms and definitions 3 4 Symbols . 5 5 Designation . 9 6 Requirements 10 6.1 Manufactur
4、ing processes 10 6.1.1 General. 10 6.1.2 Material for the components 10 6.1.3 Manufacturing processes for lattice girders 10 6.1.4 Design 10 6.2 Properties 10 6.2.1 Properties in the tensile test 10 6.2.2 Shear force of the welded joints . 11 6.2.3 Bend performance 12 6.3 Form, dimensions and limit
5、deviations of the lattice girders 12 6.3.1 Design 12 6.3.2 Dimensions 12 6.3.3 Limit deviations for the lattice girders . 12 7 Identification of the products 12 8 Proof of conformity. 12 Annex A (informative) Examples of welds in lattice girders 13 Annex B (informative) Information on and examples o
6、f lattice girder designations 14 2 DIN 488-5:2009-08 Foreword DIN 488-5:2009-08 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). It is the first German standard on lattice g
7、irders. 1 Scope This standard specifies the technical delivery conditions and mechanical and geometric properties of lattice girders used for the reinforcement of reinforced and prestressed concrete. The specific requirements for steel grades B500A (1.0438) and B500B (1.0439) used for the manufactur
8、e of lattice girders are covered by DIN 488-1, DIN 488-2 and DIN 488-3. NOTE At the time of publication of this standard, application conditions are to be taken from the general building inspectorate approvals. 2 Normative references The following referenced documents are indispensable for the appli
9、cation 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, Reinforcing steel Part 2: Reinforcing s
10、teel bars DIN 488-3, Reinforcing steel Part 3: Reinforcing steel in coils, steel wire DIN 488-6:2009-08, Reinforcing steel Part 6: Assessment of conformity DIN EN 10025-2, Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-alloy structural steels 3 Terms and def
11、initions For the purposes of this document, the terms and definitions in DIN 488-1 and DIN 488-6 and the following apply. 3.1 lattice girder two- or three-dimensional reinforcing element consisting of an upper chord, one or more lower chords and continuous or discontinuous diagonals which are resist
12、ance spot welded to the chords at all the contact points (see Figure 1) 3.2 lower chord set of reinforcing steel bars arranged in the longitudinal direction in the lower part of the lattice girder NOTE The reinforcing steel bars forming the lower chord in the longitudinal direction can be interconne
13、cted or not interconnected. 3 DIN 488-5:2009-08 3.3 upper chord longitudinal reinforcement of reinforcing steel or steel strip arranged in the upper part of a lattice girder 3.4 diagonals reinforcing steel bars connecting top and bottom chord of a lattice girder NOTE They form harmonic curves in con
14、tinuous diagonals or are independent elements in discontinuous diagonals. 3.5 length L overall length of a lattice girder 3.6 design height H1distance between the lowest point of the lower chord and the highest point of the upper chord 3.7 overall height H2distance between the lowest point and highe
15、st point of a lattice girder 3.8 overhang u1, u2length of the diagonals beyond the upper chord (u1) or the lower chord (u2) 3.9 design width B1distance between the outermost points of the lower chords 3.10 overall width B2distance between the outermost points of a lattice girder 3.11 diagonal pitch
16、Psdistance between successive connecting points of diagonals with the chords 3.12 diagonal inclination angle between the centreline of a diagonal and the longitudinal axis of a lattice girder in the plane of the diagonal at the mid-height of a lattice girder 4 DIN 488-5:2009-08 4 Symbols See Table 1
17、. Table 1 Symbols Symbol Unit Description AChmm2Cross-sectional area of a chord bar ADimm2Cross-sectional area of a diagonal B1mm Design width B2mm Overall width D mm Mandrel diameter d mm Nominal diameter of a bar dmaxmm Nominal diameter of the thickest bar dminmm Nominal diameter of the thinnest b
18、ar FjN Shear force of a welded joint FsN Shear force of an individual weld H1mm Design height H2mm Overall height L mm Length Psmm Diagonal pitch Re,ChMPaaYield strength of the chord Re,DiMPaaYield strength of the diagonals tsmm Thickness of the steel strip u1, u2mm Overhang oInclination of the diag
19、onal a1 MPa = 1 N/mm2. 5 DIN 488-5:2009-08 Figure 1 a) Examples of design of lattice girders with continuous diagonals Figure 1 b) Examples of design of lattice girders with discontinuous diagonals Figure 1 Examples of lattice girder design 6 DIN 488-5:2009-08 Figure 2 a) Figure 2 b) Figure 2 c) Key
20、 1 upper chord 2 diagonal 3 lower chord Figure 2 Height (H1, H2), width (B1, B2), overhang (u1, u2), diagonal pitch (Ps) and diagonal inclination () of a lattice girder 7 DIN 488-5:2009-08 Dimensions in millimetres Key 1 upper chord 2 diagonal 3 lower chord Figure 3 a) Dimensions in millimetres Key
21、1 upper chord 2 diagonal 3 lower chord Figure 3 b) Figure 3 S type lattice girder with upper chord made of indented steel strip 8 DIN 488-5:2009-08 Table 2 S type lattice girders as shown in Figure 3 b) with upper chord made of indented steel strip Dimensions in millimetres Upper chords h1b140 3,5 1
22、4 31 40 2,0 13 27 35 1,5 11 24 Dimensions in millimetres Key 1 upper chord 2 diagonal (d = 7 mm for h 140 mm and d = 8 mm for h 180 mm) 3 lower chord (d = 6 mm) Figure 4 MQ type lattice girder with upper chord made of indented steel strip 5 Designation The products covered by this part of DIN 488 sh
23、all be designated in the following order: a) term for the product form and/or product name (lattice girder); b) number of this part of DIN 488; c) type and dimensions of the lattice girder; d) nominal dimensions and associated steel grade (name) and surface geometry of the reinforcing steels and/or
24、steel strips used. NOTE Lattce girders can be described as shown in Figure 1 to Figure 4 or by a fully dimensioned drawing. Further information and examples of the designation of lattice girders are given in the informative Annex B. 9 DIN 488-5:2009-08 6 Requirements 6.1 Manufacturing processes 6.1.
25、1 General See DIN 488-1:2009-08, 7.1. 6.1.2 Material for the components The lower chord, upper chord and diagonals shall be manufactured from reinforcing steel according to DIN 488-1, DIN 488-2 and/or DIN 488-3. For upper chords, materials for steel strips according to DIN EN 10025-2 may also be use
26、d. 6.1.3 Manufacturing processes for lattice girders All lattice girders shall be factory-made from bars and/or coils. The connections between the chords and diagonals shall be made by electrical projection welding (electrical resistance spot welding) by automatic machines at the factory. Different
27、reinforcing steel grades may be used for the lattice girder construction. For the indented steel strip upper chord of type S lattice girders, a material with a yield strength (Re) of at least 420 N/mm2, a tensile strength (Rm) of at least 500 N/mm2and an elongation after fracture (A10) of at least 8
28、 % shall be used. For the indented steel strip upper chord of type MQ lattice girders (with loops as shown in Figure 4), material S235JR according to DIN EN 10025-2 shall be used. 6.1.4 Design The ratio of the smallest nominal diameter dminto the largest nominal diameter dmaxshall be greater than 0,
29、3 for bars. If steel strips are welded to bars, the following applies: ts 0,15 d ts 1,5 mm where tsis the thickness of the steel strip; d is the nominal diameter of the diagonal. The cross-sectional dimensions of the upper chord made of steel strip for type S lattice girders shall not deviate by mor
30、e than 4 % in any single case. 6.2 Properties 6.2.1 Properties in the tensile test See DIN 488-1:2009-08, Table 2. 10 DIN 488-5:2009-08 6.2.2 Shear force of the welded joints The joint can consist of one or more welds. The strength of the welded joint Fjis the sum of the weld strengths Fs. Fj= FsNOT
31、E Annex A gives some examples of the relationship between Fjand Fs. 6.2.2.1 Shear force of the welded joints in standard lattice girders The strength of the welded joint Fjshall correspond to at least the following minimum value and 5 % quantile: Fj 0,30 Re,Ch AChFj5% 0,35 Re,Ch AChThe strength of t
32、he individual weld shall correspond to at least the following minimum value and 5 % quantile: when anchoring the diagonal by means of a weld and a bend (e.g. Figure A.1): Fs 0,30 Re,Di ADi 4,5 kN Fs5% 0,35 Re,Di ADi when anchoring the diagonal just with the weld (e.g. Figure A.3): Fs 0,6 Re,Di ADi 4
33、,5 kN Fs5% 0,7 Re,Di ADiNOTE Higher shear forces may be required, e.g. as a result of certain assembly conditions. The characteristic value given in DIN 488-1:2009-08, Table 1 shall be used for the yield strength, and the nominal value shall be used for the cross-sectional area. 6.2.2.2 Shear force
34、of the welded joint in lattice girders with an upper chord made of indented steel strip The strength of the individual weld in sheet upper chords shall correspond to the following minimum values: type MQ lattice girders Fs 15,4 kN type S lattice girders (ts= 1,5 mm to ts= 2,0 mm) Fs 12,0 kN type S l
35、attice girders (ts= 3,5 mm) Fs 21,9 kN. 11 DIN 488-5:2009-08 6.2.3 Bend performance The bend performance of the reinforcing steel used for manufacturing lattice girders is regarded as proven by the rebend test as specified in DIN 488-2 and DIN 488-3. 6.3 Form, dimensions and limit deviations of the
36、lattice girders 6.3.1 Design Possible designs of lattice girders according to this standard are shown in Figures 1 to 4. 6.3.2 Dimensions Brief designations are widely used to describe lattice girders. Their structure can be taken from tables issued by manufacturers. Lattice girders can also be desc
37、ribed as shown in Figures 1 to 4 or by a fully dimensioned drawing. 6.3.3 Limit deviations for the lattice girders The maximum permitted deviations for the manufacturing process are as follows: Length (L): 40 mm/+10 mm if L 5,0 m 0,8 %/+10 mm if L 5,0 m Height (H1, H2): mm 13+Width (B1, B2): 7,5 mm
38、Pitch (Ps): 2,5 mm (mean according to DIN 488-6:2009-08, 6.4) Maximum overhang: can be agreed at the time of enquiry and order. 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
39、 this standard shall be given as specified in DIN 488-6. 12 DIN 488-5:2009-08 Annex A (informative) Examples of welds in lattice girders (+weld) Figure A.1 Fj= 2 FsFigure A.2 Fj= 4 FsFigure A.3 Fj= 4 FsFigure A.4 Fj= 2 FsFigure A.5 Fj= 1 FsFigure A.6 Fj= 2 FsFigure A.7 Fj= 1 FsFigure A.8 Fj= 2 Fs13
40、DIN 488-5:2009-08 14 Annex B (informative) Information on and examples of lattice girder designations The type of lattice girder can be identified by reference to Figures 1 to 4. The overall height is generally given as the dimension. For the correlation of the bars to the steel grades, the abbrevia
41、tions U (lower chord), D (diagonal) and O (upper chord), A (B500A) and B (B500B) can be used. EXAMPLE 1 Lattice girder as shown in Figures 1 a) a) and 1 a) c) of this standard with an overall height of 150 mm, an upper chord of 8 mm diameter (B500A+G), diagonals of 6 mm diameter (B500A+G) and lower
42、chords of 7 mm diameter (B500B): Lattice girder DIN 488-5/Figures 1 a) a) and 1 a) c)/150/U7B-D6A+G-O8A+G EXAMPLE 2 Lattice girder as shown in Figure 3 of this standard with an overall height of 220 mm with lower chords of 8 mm (B500A), diagonals of 8 mm in B500A+G and upper chord of steel strip 40
43、2: Lattice girder DIN 488-5/Figure 3/220/U8A-D8A+G-O402 Lattice girder DIN 488-5/S/220/U8A-D8A+G-O402 EXAMPLE 3 Lattice girder as shown in Figure 4 of this standard with an overall height of 120 mm, diagonals of 7 mm in B500A+G and lower chord of 6 mm diameter (B500B): Lattice girder DIN 488-5/Figure 4/120/U6B-D7A+G Lattice girder DIN 488-5/MQ/120/U6B-D7A+G
