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Design-of-Highway-Pavements
The axle load and stress ratio of various axle loads are represented in table below. The expected number of repetitions is also provided against each axle load. Using data given below, find cumulative fatigue life.
Axle load (AL)
Stress ratio
Expected repetitions (n)
Single axle
20
0.58
67544
18
0.50
165645
16
0.43
487907
Tandem axle
36
0.48
35765
32
0.42
35765
| Axle load (AL) | Stress ratio | Expected repetitions (n) |
|---|---|---|
| Single axle | ||
| 20 | 0.58 | 67544 |
| 18 | 0.50 | 165645 |
| 16 | 0.43 | 487907 |
| Tandem axle | ||
| 36 | 0.48 | 35765 |
| 32 | 0.42 | 35765 |
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This Chapter Design-of-Highway-Pavements consists of the following topics
The design of dowel bar was carried out and the following were found out:
The load carried by outer dowel bar, Pt=1432 kg
The modulus of dowel/concrete interaction, K = 41500 kg/cm2/ cm
The modulus of elasticity, E = 2×106 kg/cm2
The moment of inertia of dowel bar, I=5.147 cm4
The relative stiffness of bar embedded in concrete, β=0.238
The joint width, Z = 2 cm
Determine the bearing stress in the dowel bar and ascertain its safety.
The axle load and stress ratio of various axle loads are represented in table below. The expected number of repetitions is also provided against each axle load. Using data given below, find cumulative fatigue life.
| Axle load (AL) | Stress ratio | Expected repetitions (n) |
|---|---|---|
| Single axle | ||
| 20 | 0.58 | 67544 |
| 18 | 0.50 | 165645 |
| 16 | 0.43 | 487907 |
| Tandem axle | ||
| 36 | 0.48 | 35765 |
| 32 | 0.42 | 35765 |
