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TB/T 3548-2019 PDF EnglishSearch result: TB/T 3548-2019
TB/T3548-2019 (TBT3548-2019): PDF in EnglishTB/T 3548-2019 TB RAILWAY INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 45.060.20 S 51 Partially replacing TB/T 1335-1996 Strength Design and Test Accreditation Specification for Rolling Stock – General ISSUED ON: APRIL 08, 2019 IMPLEMENTED ON: NOVEMBER 01, 2019 Issued by: National Railway Administration of the People’s Republic of China Table of Contents Foreword ... 3 1 Scope ... 5 2 Normative References ... 5 3 Terms and Definitions ... 6 4 Coordinate System and Unit System ... 7 5 Classification of Rolling Stock ... 8 6 Structural Strength Requirements ... 9 7 Material Properties ... 24 8 Verification Procedures ... 24 9 Test Apparatus and Test Point Layout ... 26 Appendix A (Normative) Test Method of Structure Dynamic Strength ... 29 Appendix B (Informative) Commonly Used Materials and Mechanical Properties of Rolling Stock ... 32 Appendix C (Normative) Strength Requirements of Main Structural Equipment on the Vehicle ... 44 Bibliography ... 49 Strength Design and Test Accreditation Specification for Rolling Stock – General 1 Scope This Standard specifies the terms and definitions, coordinate system and unit system, classification, structural strength requirements, material properties, verification procedures, and test equipment and measurement point layouts for the strength design and test of rolling stock. This Standard is applicable to the strength design and test accreditation of rolling stocks, EMUs, and passenger cars. Special rolling stocks and urban rail vehicles can be implemented by reference (except for special test requirements). 2 Normative References The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this document. GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature GB/T 4549 (all parts) Railway Vehicle Vocabulary GB/T 32059 Fatigue Load Test Method for Windows, Doors of High Speed Multiple Unit TB/T 1451 Foreside Windscreen for Locomotives and Motor Units TB/T 3094 Vestibule Diaphragm of Locomotive and Rolling Stock TB/T 3107 Unit Combined Windows for Railway Passenger Car TB/T 3108 Sliding Plug Door for Railway Passenger Car TB/T 3263 Passenger Seat for Powered Car Train-set TB/T 3266 General Technical Specifications for Doors of Locomotive The integral welded parts that are used to connect the axle box and transmit the force in the bogie; they are generally located between the primary suspension and the secondary suspension. NOTE: Rewrite GB/T 4549.2-2004, definition 3.1. 3.7 Exceptional load Occasionally, the maximum load that does not affect the integrity of the rolling stock and the normal operation. NOTE: For example, the impact load that is generated by rolling stock during shunting, etc. 3.8 In-service load A load that often occurs and does not affect the integrity and normal operation of the rolling stock, but shall affect the fatigue performance of the rolling stock. 3.9 Connecting device for car body equipment Fasteners for equipment installation on the car body and related local load-bearing structures or installation structures. NOTE: For example, traction transformer mounts, etc. 3.10 Connecting device for bogie frame equipment Fasteners for equipment installation on the bogie frame and related local load-bearing structure or installation structure. NOTE: For example, the suspension base of the frame suspension traction motor. 3.11 Connecting device for axle-box equipment Fasteners for equipment installation on the axle box and related local load-bearing structure or installation structure. NOTE: For example, speed sensor mounting bolts, etc. 4 Coordinate System and Unit System 4.1 Coordinate system The coordinate system is shown in Figure 1. The longitudinal direction of the rolling stock corresponds to the X-axis, the transverse direction corresponds to the Y-axis, and the vertical direction corresponds to the Z-axis. Using the right-hand rule control cars in relatively articulated power-concentrated EMUs are classified in this category. Its structure type is identified as P. 5.5 Freight cars The non-articulated railway vehicles used for the goods transportation are classified into this category (excluding special freight cars such as long and large freight cars). This group defines two structure types, and the corresponding type identifiers are as follows: a) Type F-I, for example: vehicles without shunting restrictions; b) Type F-II, for example: vehicles that the hump shunting and push-off shunting are not allowed. 6 Structural Strength Requirements 6.1 General requirements 6.1.1 Basic principles 6.1.1.1 When designing rolling stock and its parts, the necessary load-bearing capacity shall be ensured. At the same time, the self-weight of rolling stock and its parts shall be reduced as much as possible, and the overall bearing capacity of the structure shall be fully utilized. 6.1.1.2 The capacity of the load-bearing members of the rolling stock without permanent deformation and fracture shall be calculated and/or verified in accordance with the verification procedures in Clause 8. The load-bearing components of rolling stock shall be evaluated based on the following criteria: a) It shall be able to withstand the maximum load during all operations, which is defined as exceptional load in this Standard; b) The operational load borne during the specified life span does not endanger the safety of the structure. 6.1.1.3 The design of rolling stock shall ensure that the natural frequency of the car body is different from the vibration frequency of the bogie suspension system, when it is in use, to avoid resonance. 6.1.1.4 For newly designed structures of rolling stock, the rods, plates, or shells that bear the compressive load shall be checked for stability by calculation or test to avoid structural failure due to loss of stability. The connection nodes of all load-bearing members shall have sufficient rigidity, and the structure shall not be unstable. For more strength tests and/or fatigue tests, in accordance with the corresponding strength test standards. 6.1.2.5 The line dynamic strength test shall be carried out in accordance with the requirements of Clause 8 after the rolling stock is finished and before being put into use. See Appendix A for the line dynamic strength test and evaluation method. 6.1.2.6 The weight of rolling stock shall be calculated in accordance with the provisions of TB/T 3342. 6.1.3 Load conditions Load conditions generally include exceptional load conditions and operating load conditions; and each load condition may include one or more independent loads. Depending on the different structures, all or part of the load conditions can be included in the calculation and/or test. During analysis and testing, the load shall be applied at an accurate position corresponding to the actual situation in the application. If it can be proved that different design loads or load conditions are more appropriate than those specified in this Standard, they shall be used in preference. For special operating conditions or design features, if technical demonstration can be provided, lower load values are acceptable. In order to verify the strength requirements, the combination of multiple loads that may appear at the same time in the actual application of the rolling stock structure shall be considered, and the most unfavourable load combination shall be selected for verification. 6.1.4 Acceptance criteria 6.1.4.1 Utilization rate Under the specified load conditions, calculations and/or tests shall be used to verify that the entire load-bearing member of the rolling stock or any individual component or any equipment connection device does not undergo permanent deformation or damage. The utilization rate of components in Formula (2) shall be no greater than 1. NOTE: it can be expressed by the following formula: σcb – buckling critical stress, in MPa; Lc – calculated or tested load, in N; Lcb – buckling critical load, in N. When the value of S3 is not specified in the strength standards of various parts of rolling stock, it shall be selected according to the following provisions: safety coefficient S3 = 1.5. Instability assessment standards is not applicable to components that have been specifically designed to fail in a controlled manner. 6.1.6 Verification of fatigue strength 6.1.6.1 Overview During its service life, the structure of rolling stock shall bear a large number of dynamic loads of varying degrees; and the impact of dynamic loads is the most significant in the dangerous parts of the structure. Examples of dangerous parts are as follows: a) Direct bearing position (including equipment connection device). b) Joints between components (such as welds, bolted joints). c) The place where the geometric shape changes where the stress is concentrated. The dangerous parts of the structure shall be confirmed, and the local features shall be inspected in detail. Take the test and/or calculation methods to verify the fatigue strength of rolling stock structures. The test methods include the following two ones: d) Bench test in laboratory. e) Line dynamic strength test. 6.1.6.2 Simulation calculation of fatigue strength The finite element simulation analysis method can be used when checking the fatigue strength of the structural components of the rolling stock through simulation calculation. The calculated load conditions shall include but not limited to the load conditions specified by the standard. 6.1.6.3 Laboratory bench test 6.1.6.3.1 Static test to simulate operating load 6.1.6.4 Line dynamic strength test The line dynamic stre.......Source: https://www.ChineseStandard.net/PDF.aspx/TBT3548-2019 |