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Repeated Loading Test

 

SECTION 6: Repeated Loading Test

 

Test Procedure:

1. Concrete tie following the vertical load test for positive moment on rail seat as figure 5., the load shall be increased at rate of at least 22 kN per minute until the tie is cracked from its bottom surface up to the level of the lower layer of reinforcement.
2. After removal of the static rail seat load necessary to produce cracking and substitution of 6 mm thick plywood strips, the tie shall be subjected to 3 million cycles of repeated loading with each cycle varying uniformly from 17 kN to the value of 87.76 kN. The repeated loading shall not exceed 600 cycles per minute. If, after the application of 3 million cycles, the tie can support the rail seat load of 87.76 kN, the requirements of this test will have been met.

 

Acceptance Criteria:

The test result shall satisfactory when concrete tie must be resists the applied load of 87.76 kN for 3 minutes after completed the repetitive load of 3 million cycles.