Laboratory Mock-up Test for Evaluation of Fatigue Performance of Concrete Slab Track

(1)

Jang, Seung Yup Cho, Yong Chin Lee, Il Hwa Lee, Su Hyoung Kim, Eun

In this study, conducted was a laboratory mock-up fatigue test on the concrete slab track to evaluate the fatigue performance of the test track under repeated loads and to verify its design.

The test has been performed on the full-scale slab track with cant, which is a precast slab track system installed on several layers of sub-soil consolidated in the laboratory soil box. The test results show that any deflection and any strain exceeding the target values have not been observed, and the test track have good performance under static and repeated loads up to 3 million cycles. As a consequence, the test method adopted in this study is believed to be a proper tool for evaluating the structural performance of the concrete slab track and its components in the laboratory.

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_

_ 

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α

α slab

Test jig

Rail

Grout Cant α

α slab

Test jig

Rail

Grout Cant

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0 0 0 0 5050 5050 100100100 100 150 150150 150 200 200200 200 250 250250 250

-0.8 -0.8-0.8 -0.8 -0.6

-0.6 -0.6 -0.6 -0.4

-0.4 -0.4 -0.4 -0.2

-0.2 -0.2 -0.2 0

0 0 0

S l a b a n d H S B D i s p l a c e me n t (mm) S l a b a n d H S B D i s p l a c e me n t (mm) S l a b a n d H S B D i s p l a c e me n t (mm) S l a b a n d H S B D i s p l a c e me n t (mm) Load (kN) Load (kN) Load (kN) Load (kN) S l a b (U p p e r :S M -2)S l a b (U p p e r :S M -2)S l a b (U p p e r :S M -2)S l a b (U p p e r :S M -2)

S l a b (L o w e r :S M -3) S l a b (L o w e r :S M -3) S l a b (L o w e r :S M -3) S l a b (L o w e r :S M -3) H S B(L o w e r :HM -2)

H S B(L o w e r :HM -2)H S B(L o w e r :HM -2) H S B(L o w e r :HM -2)

R a i l (U p p e r :R M -2) R a i l (U p p e r :R M -2)R a i l (U p p e r :R M -2) R a i l (U p p e r :R M -2)

R a i l (L o w e r :R M -4) R a i l (L o w e r :R M -4) R a i l (L o w e r :R M -4) R a i l (L o w e r :R M -4)

00 00 50 50 50 50 100 100 100 100 150150 150150 200 200 200 200 250 250 250 250

-0.2 -0.2 -0.2 -0.2 -0.15 -0.15 -0.15 -0.15 -0.1

-0.1-0.1 -0.1 -0.05 -0.05-0.05 -0.05 0

00 0

R a i l D i s p l a c e me n t (mm) R a i l D i s p l a c e me n t (mm) R a i l D i s p l a c e me n t (mm) R a i l D i s p l a c e me n t (mm) Load (kN)Load (kN)Load (kN)Load (kN)

U p p e r :R M -1 U p p e r :R M -1U p p e r :R M -1 U p p e r :R M -1 L o w e r :R M -2

L o w e r :R M -2 L o w e r :R M -2 L o w e r :R M -2

0 00 0 505050 50 100 100100 100 150150150 150 200 200200 200 250250250 250

-50-50-50 -50 -40-40 -40-40 -30-30 -30-30 -20-20-20 -20 -10-10 -10-10 00 00

R a i l S t r e s s (M p a ) R a i l S t r e s s (M p a ) R a i l S t r e s s (M p a ) R a i l S t r e s s (M p a ) Load (kN)Load (kN)Load (kN)Load (kN) L o w e r :R S -2L o w e r :R S -2L o w e r :R S -2L o w e r :R S -2

U p p e r :R S -1 U p p e r :R S -1 U p p e r :R S -1 U p p e r :R S -1

00 00 50 50 50 50 100 100 100 100 150 150 150 150 200 200 200 200 250250 250250

0.0 0.0 0.0

0.0 2.02.02.02.0 4.04.04.04.0 6.06.06.06.0 8.08.08.08.0 R o a d b e d p r e s s u r e (k P a )

R o a d b e d p r e s s u r e (k P a )R o a d b e d p r e s s u r e (k P a ) R o a d b e d p r e s s u r e (k P a ) Load (kN)Load (kN)Load (kN)Load (kN) U p p e r :P -1U p p e r :P -1U p p e r :P -1U p p e r :P -1

L o w e r :P -2 L o w e r :P -2 L o w e r :P -2 L o w e r :P -2

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구 분 기호

탄성구간

구 분 기호

탄성구간

500회 300만회 500회 300만회

최대 최소 최대 최소 최대 최소 최대 최소

변형률



레일 RS-1 -54.47 -623.9 -55.03 -629.1

변위 mm

레일

RM-1 -0.895 -0.546 -1.033 -1.244 RS-2 -39.84 -346.5 -40.71 -374.4 RM-2 -0.318 -1.755 -2.046 -3.281 슬래브

SS-3 65.19 -58.19 147.79 46.53 RM-3 0.41 0.055 0.23 -0.212 SS-4 -1.89 -33.7 8.89 -29.24 RM-4 -0.5 -2.726 -1.478 -3.977 SS-10 -0.34 -35.5 -19.75 -62.78

슬래브 SM-2 -0.138 -0.572 -1.148 -1.449 SS-11 8.09 -1.58 16.33 8.64 SM-3 -0.222 -1.072 -1.236 -2.092 안정화

기층

HS-1 7.2 -3.87 25.51 14.60 안정화 기층

HM-1 -0.134 -0.494 -1.02 -1.422 HS-2 1.08 -5.85 19.87 12.49 HM-2 -0.158 -0.598 -1.138 -1.642

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-5 -5 -5 -5 -4 -4 -4 -4 -3 -3 -3 -3 -2-2 -2-2 -1 -1 -1 -1 0 0 0 0 0 00

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Cy c l e s Cy c l e sCy c l e s Cy c l e s Rail Displacement Rail Displacement Rail Displacement Rail Displacement .... [V](mm)[V](mm)[V](mm)[V](mm)

Ma x.

Ma x.Ma x.

Ma x. Mi n .Mi n .Mi n .Mi n . -5 -5-5 -5 -4 -4-4 -4 -3-3-3 -3 -2-2-2 -2 -1 -1-1 -1 00 00 0 00

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Cy c l e s Cy c l e s Cy c l e s Cy c l e s Rail Displacement Rail Displacement Rail Displacement Rail Displacement .... [V](mm) [V](mm) [V](mm) [V](mm)

Ma x.

Ma x. Mi n .Mi n .Mi n .Mi n .

-1.5 -1.5 -1.5 -1.5 -1 -1 -1 -1 -0.5 -0.5 -0.5 -0.5 000 0 0.5 0.50.5 0.5 111 1 0 0 0

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Cy c l e s Cy c l e sCy c l e s Cy c l e s Rail Displacement Rail Displacement Rail Displacement Rail Displacement .... [H] (mm) [H] (mm) [H] (mm) [H] (mm)

Ma x.

-1.5-1.5 -1.5-1.5 -1 -1 -1 -1 -0.5-0.5 -0.5-0.5 0 00 0 0.5 0.50.5 0.5 111 1 0 0 0

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Cy c l e s Cy c l e s Cy c l e s Cy c l e s Rail Displacement Rail Displacement Rail Displacement Rail Displacement .... [H] (mm)[H] (mm)[H] (mm)[H] (mm)

Ma x.

Ma x.Ma x.

-2.5-2.5 -2.5-2.5 -2 -2 -2 -2 -1.5-1.5 -1.5-1.5 -1 -1 -1 -1 -0.5 -0.5 -0.5 -0.5 0 00 0 0 0 0

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Cy c l e s Cy c l e sCy c l e s Cy c l e s Salb Displacement Salb Displacement Salb Displacement Salb Displacement .... [V] (mm)[V] (mm)[V] (mm)[V] (mm)

Ma x.

Ma x.Ma x.

-2.5 -2.5 -2.5 -2.5 -2 -2 -2 -2 -1.5 -1.5 -1.5 -1.5 -1 -1 -1 -1 -0.5-0.5 -0.5-0.5 0 00 0 0 00

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Cy c l e s Cy c l e s Cy c l e s Cy c l e s Salb Displacement Salb Displacement Salb Displacement Salb Displacement . . . . [V] (mm)[V] (mm)[V] (mm)[V] (mm)

Ma x.

Ma x.Ma x.

-2.5 -2.5-2.5 -2.5 -2.0 -2.0-2.0 -2.0 -1.5 -1.5-1.5 -1.5 -1.0 -1.0-1.0 -1.0 -0.5-0.5-0.5 -0.5 0.0 0.0 0.0 0.0 0 00

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Cy c l e s Cy c l e s Cy c l e s Cy c l e s HSB Displacement HSB Displacement HSB Displacement HSB Displacement .... [V](mm) [V](mm) [V](mm) [V](mm)

Ma x.

-2.5-2.5-2.5 -2.5 -2.0 -2.0-2.0 -2.0 -1.5-1.5-1.5 -1.5 -1.0 -1.0-1.0 -1.0 -0.5 -0.5-0.5 -0.5 0.0 0.0 0.0 0.0 0 00

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Cy c l e s Cy c l e s Cy c l e s Cy c l e s HSB Displacement HSB Displacement HSB Displacement HSB Displacement .... [V](mm)[V](mm)[V](mm)[V](mm)

Ma x.

Ma x.Ma x.

-40 -40 -40 -40

-30 -30 -30 -30

-20-20 -20-20

-10-10 -10-10

000 0 0 0 0

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Cy c l e s Cy c l e sCy c l e s Cy c l e s

Pressure(kPa) Pressure(kPa) Pressure(kPa) Pressure(kPa) ....

Ma x.

-40 -40 -40 -40

-30-30 -30-30

-20 -20 -20 -20

-10 -10 -10 -10

0 0 0 0 0 00

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Cy c l e s Cy c l e s Cy c l e s Cy c l e s

Pressure(kPa) Pressure(kPa) Pressure(kPa) Pressure(kPa) ....

Ma x.

Ma x.Ma x.

-150 -150 -150 -150

-100 -100 -100 -100

-50 -50 -50 -50

0 00 0 0 00

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Rail Stress (MPa) Rail Stress (MPa) Rail Stress (MPa) Rail Stress (MPa) ....

Mi n . Mi n . Mi n . Mi n . Ma x.Ma x.Ma x.Ma x.

-150 -150-150 -150

-100 -100-100 -100

-50-50 -50-50

000 0 0 00

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Cy c l e s Cy c l e s Cy c l e s Cy c l e s Rail Stress (MPa) Rail Stress (MPa) Rail Stress (MPa) Rail Stress (MPa) ....

-2 -2-2 -2

-1.5-1.5-1.5 -1.5

-1 -1-1 -1

-0.5-0.5-0.5 -0.5

0 0 0 0

0.5 0.5 0.5 0.5 0 00

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Cy c l e s Cy c l e s Cy c l e s Cy c l e s

Slab Stress (MPa) Slab Stress (MPa) Slab Stress (MPa) Slab Stress (MPa) ....

Mi n . Mi n .Mi n . Mi n . Ma x.Ma x.Ma x.Ma x.

-2 -2-2 -2

-1.5 -1.5 -1.5 -1.5

-1 -1-1 -1

-0.5-0.5 -0.5-0.5

0 00 0 0 00

0 1000000100000010000001000000 2000000200000020000002000000 3000000300000030000003000000

Slab Stress (MPa) Slab Stress (MPa) Slab Stress (MPa) Slab Stress (MPa) ....