GB/T 1499.3-2022 PDF EnglishUS$170.00 · In stock · Download in 9 seconds
GB/T 1499.3-2022: Steel for the reinforcement of concrete - Part 3: Welded fabric Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 1499.3: Historical versions
GB/T 1499.3-2022: Steel for the reinforcement of concrete - Part 3: Welded fabric---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT1499.3-2022GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.60 CCS H 44 Replacing GB/T 1499.3-2010 Steel for the reinforcement of concrete - Part 3.Welded fabric Issued on. OCTOBER 12, 2022 Implemented on. MAY 01, 2023 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 Introduction... 5 1 Scope... 6 2 Normative references... 6 3 Terms and definitions... 6 4 Classification and labeling... 8 5 Order contents... 9 6 Technical requirements... 9 7 Test methods... 11 8 Inspection rules... 14 9 Packaging, marking and quality certificate... 17 Annex A (normative) Shaped welded fabric model... 18 Annex B (informative) Standard welded fabric models for bridge decks and buildings ... 20ForewordThis document was drafted in accordance with the rules given in GB/T 1.1-2020 "Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents". This document is Part 3 of GB/T 1499 "Steel for the reinforcement of concrete". The following parts of GB/T 1499 have been issued. - Part 1.Hot rolled plain bars; - Part 2.Hot rolled ribbed bars; - Part 3.Welded fabric. This document replaces GB/T 1499.3-2010 "Steel for the reinforcement of concrete - Part 3.Welded fabric". Compared with GB/T 1499.3-2010, in addition to the structural and editorial changes, the main technical changes in this document are as follows. - Added CRB600H high ductility cold rolled ribbed reinforcing bar (see Chapter 6 of this Edition); - Added the diagonal difference requirements of welded steel fabric (see 6.3.4 of this Edition); - Changed the test method for tensile test (see 7.2.2 of this Edition, 7.2.2 of Edition 2010); - Changed the test method for bending test (see 7.2.1 of this Edition, 7.2.3 of Edition 2010); - Changed the test method for shear resistance test (see 7.2.1 of this Edition, 7.2.4 of Edition 2010). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority shall not be held responsible for identifying any or all such patent rights. This document was proposed by National Iron and Steel Industry Association. This document shall be under the jurisdiction of National Technical Committee on Steel of Standardization Administration of China (SAC/TC 183). The drafting organizations of this document. China Metallurgical Construction Research Institute Co., Ltd., Metallurgical Industry Information Standards Research Institute, Anhui Maanshan Iron and Steel Biasi Rebar Welded Mesh Co., Ltd., Beijing Xinggang Welded Mesh Technology Development Co., Ltd., Anyang Fosun Heli New Materials Co., Ltd., Jian Branch Machinery (Tianjin) Co., Ltd., Beijing Yuanda International Engineering Management Consulting Co., Ltd. Main drafters of this document. Zhu Jianguo, Wang Yujie, Li Xiaobin, Wan Ensan, Zhang Wei, Li Yajie, Zhang Xin, Liu Baoshi, Lv Shanglin, Wang Chunjiang, Zhu Wensheng, Feng Linshuang, Chen Wei, Han Yuzhen, Li Mingrui, Chang Liang, Zhang Ranran. This document was issued in 2002 for the first time. The first revision was in 2010.This is the second revision.1 ScopeThis document specifies the classification and labeling, order content, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of welded fabric for the reinforcement of concrete. This document applies to welded fabrics (hereinafter referred to as the welded fabric) made of cold-rolled ribbed steel bars or (and) hot-rolled round steel bars and hot-rolled ribbed steel bars by resistance welding. Welded fabrics welded with other types of bars can use this document as reference.2 Normative referencesThe following referenced documents are 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. GB/T 1499.1, Steel for the reinforcement of concrete - Part 1.Hot rolled plain bars GB/T 1499.2, Steel for the reinforcement of concrete - Part 2.Hot rolled ribbed bars GB/T 13788, Cold rolled ribbed steel bars GB/T 17505, Steel and steel products - General technical delivery requirements3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply. 3.1 welded fabric A fabric in which the longitudinal bars and transverse bars are arranged at a certain interval and at right angles to each other, and all intersection points are welded together by resistance spot welding. The shape of the welded fabric is shown in Figure 1. 3.2 longitudinal bars The bars aligned parallel to the manufacturing direction of the welded fabric. 3.3 transverse bars The bars aligned perpendicular to the manufacturing direction of the welded fabric. 3.4 twin bars Two bars of the same type and of the same nominal diameter that are juxtaposed against each other in the welded fabric. 3.5 spacing The distance between the centerlines of adjacent bars in the same direction in the welded fabric. For twin bars, the centerline is the common tangent of the contact point of the two bars. 3.6 overhang The length of the longitudinal and transverse bars that is beyond the centerline of the outermost transverse and longitudinal bars of the welded fabric.4 Classification and labeling4.1 Classification The welded fabric is divided into two types. shaped welded fabric and customized welded fabric, according to the bar designation, nominal diameter, length and spacing. 4.2 Shaped welded fabric and labeling 4.2.1 The bar designation, nominal diameter, length and spacing of shaped welded fabric can be different in both directions. However, in the same direction, the bars of the same designation and nominal diameter shall be used with the same length and spacing. 4.2.4 See Annex B for standard welded fabric models for bridge decks and buildings. 4.3 Customized welded fabric and labeling The bars and their lengths and spacings used in the customized welded fabric shall be determined by negotiation between the supplier and the buyer according to the requirements of the buyer.5 Order contentsThe contract for ordering according to this document shall at least include the followings.6 Technical requirements6.1 Bars 6.1.1 The welded fabric shall be made of CRB550 cold-rolled ribbed steel bars in accordance with GB/T 13788, CRB600H high-ductility cold-rolled ribbed steel bars, hot-rolled round steel bars specified in GB/T 1499.1, hot-rolled ribbed steel bars specified in GB/T 1499.2. 6.1.2 Bars with a nominal diameter of 5mm~18mm shall be used for the welded fabric. After the agreement between the supplier and the buyer, and it is indicated in the contract, the bars with other nominal diameters can also be used. 6.1.3 When the welded fabric is a single bar in both directions, the nominal diameter of the thinner bar shall not be less than 0.6 times the nominal diameter of the thicker bar. 6.2 Manufacturing 6.2.1 The welded fabric shall be mechanically manufactured. The intersections of the bars in both directions are welded by resistance welding. 6.3 Fabric size and allowable deviation 6.3.1 The longitudinal bar spacing of the welded fabric shall be an integral multiple of 50mm. The spacing of transverse bar shall be an integral multiple of 25mm. The minimum spacing shall be 100mm. The allowable deviation of the spacing takes the larger value of ±10mm and ±5% of the specified spacing. 6.4 Weight and allowable deviation 6.4.1 The welded fabric shall be delivered by actual weight. It can also be delivered by theoretical weight. 6.4.2 The theoretical weight of the welded fabric is calculated according to the nominal diameter and specified size of the constituent bars. When calculating, the density of steel is 7.85g/cm3.The allowable deviation between the actual weight of the welded fabric and the theoretical weight shall be ±4%. 6.5 Performance requirements 6.5.1 The mechanical and technological properties of welded fabric bars shall comply with the provisions of the corresponding designations of the bars in the corresponding standards. 6.6 Surface quality7 Test methods7.1 Sampling method 7.1.1 Welded fabric specimens shall be taken from the finished fabric. However, the intersections contained in the specimen shall not be welded. Except for the removal of excess parts, the specimen shall not be subjected to other processing. 7.1.2 The schematic diagram of the specimen used in the tensile test is shown in Figure 3. 7.1.3 One specimen for bending test shall be respectively cut along two directions of the welded fabric. The specimen shall ensure that the bent part is at least 25mm away from the cross welding point during the test. 7.1.4 The specimen for shear resistance test is shown in Figure 4.Three specimens shall be randomly intercepted along the same transverse bar. 7.2 Test methods 7.2.1 Inspection items The inspection items, sampling methods and test methods of each batch of welded fabric shall comply with the provisions of Table 1. 7.2.2 Tensile test The tensile test of the welded fabric shall be carried out in accordance with the provisions of GB/T 33365 7.2.3 Weight deviation After measuring the weight and length of a typical specimen with weight deviation, calculate the weight deviation. The deviation We between the actual weight and the theoretical weight is calculated according to formula (1). 7.3 Numerical rounding and determination The numerical rounding and determination of the inspection results shall be in accordance with the provisions of YB/T 081.8 Inspection rules8.1 General The exit-factory inspection and user acceptance of welded fabric shall be carried out in accordance with the provisions of 8.2. 8.2 Routine inspection 8.2.1 Batching rules The welded fabric shall be inspected and accepted in batches. Each batch shall consist of welded fabric of the same model, the same source of raw materials, the same production equipment and manufactured in the same continuous period of time. 8.2 Inspection items In addition to checking the number of welded joints, each batch of welded fabric shall be tested according to the items specified in Chapter 7. 8.3 Inspection of eigenvalues 8.3.1 Inspection of applicability The inspection of eigenvalues is suitable for the following situations. 8.3.2 Evaluation of test results 8.3.2.1 Parameter inspection To check the specified properties, such as the characteristic parameter specified plastic elongation strength (Rp0.2), tensile strength (Rm), elongation at break (A) or total elongation at maximum force (Agt), the following parameters shall be determined.9 Packaging, marking and quality certificate9.1 The welded fabric shall be bundled neatly and firmly. If necessary, rigid supports or brackets shall be added to prevent the deformation of the welded fabric affecting the use during transportation and hoisting. 9.3 The welded fabric shall be delivered with quality certificate, indicating manufacturer's name, buyer’s name, document number, model, batch number, size, number or weight of the welded fabric delivered, inspection results of each inspection item, and imprint of the quality inspection department of the supplier. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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