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TB/T 1878-2002 English PDF (TBT1878-2002)

TB/T 1878-2002 English PDF (TBT1878-2002)

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TB/T 1878-2002: Prestressed concrete sleeper fatigue test methods

This standard specifies the fatigue test method for standard gauge railway prestressed concrete sleepers (including switch sleepers, wide sleepers, bridge sleepers). This standard is applicable to fatigue tests for scientific research, new product development, product quality inspection of standard gauge railway prestressed concrete sleepers (including switch sleepers, wide sleepers, bridge sleepers). 2 Test equipment and measuring tools 2.1 The fatigue test of prestressed concrete sleepers (hereinafter referred to as sleepers) shall use a fatigue testing machine, which has an accuracy level 1 and a loading vibration frequency between 4 Hz ~ 8 Hz. 2.2 Use a 20X reading magnifying glass, to observe the crack width. The reading accuracy is 0.01 mm; there is lighting equipment. 3 Test pattern 3.1 The test pattern of the section under the rail is as shown in Figure 1. ???? - Steel plate whose one side has a slope of 1:40 (100 mm x 20 mm); ???? - Wooden backing boards (l00 mm x 15 mm); ???? - Bearing steel plate (100 mm x 20 mm); ???? - Steel shaft diameter d is 30 mm ~ 40 mm or steel ball radius R = 40 mm; The unit is mm TB/T 1878-2002 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 5 of 8 ???? - Steel shaft diameter d is 30 mm ~ 40 mm or steel ball radius R = 150 mm. Figure 1 The relationship -- between the test load Fmax and the test bending moment M -- can be determined by the following formula: Where: Fmax - The maximum fatigue test load at the test age (kN); M - Bending moment of fatigue test at test age (kN????m). M is given by the design drawing. 3.2 The test pattern of the middle section is as shown in Figure 2. Among them, the relationship -- between the inspection bending moment M and the inspection load Fmax -- can be determined by formula (1). M is given by the design drawing. ???? - Flat steel plate (100 mm x 20 mm); ???? -
TB/T 1878-2002
TB
RAILWAY INDUSTRY STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
Replacing TB/T 1878-1987
Fatigue test method for prestressed concrete sleepers
ISSUED ON: MAY 17, 2002
IMPLEMENTED ON: DECEMBER 01, 2002
Issued by: Ministry of Railway of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Test equipment and measuring tools ... 4
3 Test pattern ... 4
4 Test steps and methods ... 6
5 Test report form ... 7
Appendix A (Informative) Fatigue strength inspection record of prestressed concrete sleeper ... 8
Fatigue test method for prestressed concrete sleepers
1 Scope
This standard specifies the fatigue test method for standard gauge railway prestressed concrete sleepers (including switch sleepers, wide sleepers, bridge sleepers). This standard is applicable to fatigue tests for scientific research, new product development, product quality inspection of standard gauge railway prestressed concrete sleepers (including switch sleepers, wide sleepers, bridge sleepers).
2 Test equipment and measuring tools
2.1 The fatigue test of prestressed concrete sleepers (hereinafter referred to as sleepers) shall use a fatigue testing machine, which has an accuracy level 1 and a loading vibration frequency between 4 Hz ~ 8 Hz.
2.2 Use a 20X reading magnifying glass, to observe the crack width. The reading accuracy is 0.01 mm; there is lighting equipment.
3 Test pattern
3.1 The test pattern of the section under the rail is as shown in Figure 1. 4 Test steps and methods
4.1 The sleepers for fatigue test shall be selected from the batches whose static load, appearance and demolding strength are all qualified in the exit-factory inspection; 6 sleepers shall be selected each time.
4.2 The fatigue test shall be carried out after the age of the sleeper is 28d. The 28d compressive strength of the concrete in the test batch shall meet the design strength requirements.
4.3 Fatigue test shall be carried out on 3 under-rail sections and 3 middle sections; only one section shall be made for each sleeper.
4.4 Characteristic value ?? of fatigue load cycle
4.6 During the fatigue test, attention shall be paid to observe whether the loading meets the requirements of the test pattern; correct it if necessary.
4.7 The fatigue test shall be carried out continuously. If the test is stopped due to irresistible factors in the middle, it shall be subject to the 2 million accumulated fatigues; it shall be indicated in the report.
4.8 Test results
4.8.1 After the sleeper is unloaded after 2 x 106 fatigue cycles, use a scale magnifying glass, to observe both sides of the test section, within 5 minutes after returning to zero. The observed position is the position of the outer row of steel wires in the tension area, where the maximum residual crack width shall not exceed 0.05 mm.
4.8.2 After the sleeper has undergone 2 x 106 fatigue cycles, the failure test shall be carried out; its failure strength shall not be lower than 80% of the design failure strength; the design failure strength shall be given by the design drawing. The sign of the failure state is that the crack width reaches 1.5 mm, OR where there are two or more cracks AND the maximum crack width reaches 1.0 mm.

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