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

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. ¢Ù - Steel plate whose one side has a slope of 1:40 (100 mm x 20 mm); ¢Ú - Wooden backing boards (l00 mm x 15 mm); ¢Û - Bearing steel plate (100 mm x 20 mm); ¢Ü - 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 ¢Ý - 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. ¢Ù - Flat steel plate (100 mm x 20 mm); ¢Ú -