Table Vii230.docx

Table VII.2.1 Cumulative Fatigue Damage Analysis for Bottom-up Cracking (Mid point if the Axle load Class from Table VII-1 is Adopted for Stress Computation) Bottom-up Cracking Fatugue Analysis for Day-time (6 hour) traffic and Positive Temperature Differential Rear Single Axles (as per Table VII-1, 1st col) Rear Tandem Axles (as per Table VII-1, 3rd col) Expected Flex Stress Allowable Fatigue Expected Flex Stress Allowable Fatigue Rep (ni) stress Ratio Rep. (NI) Damage Rep. (ni) Stress Ratio Rep. (NI) Damage MPa (SR) (ni/NI) MPa (SR) (ni/NI) 29396

3.247

0.656

6513

4.513

50056

2.8055 0.567

77933

0.642

33546

3.128

0.632

12763

2.628

25786

2.6976 0.545

143689

0.179

25974

3.008

0.608

25010

1.039

6674

2.5897 0.523

290566

0.023

19986

2.888

0.583

49006

0.408

10618

2.4817 0.501

713832

0.015

9064

2.768

0.559

96028

0.094

11194

2.3738 0.480

2476456

0.005

8409

2.649

0.535

194161

0.043

8161

2.2659 0.458

18917537

0.000

6589

2.529

0.511

467647

0.014

14865

2.158

0.436

Infinite

0.000

6644

2.409

0.487

1562222

0.004

12711

2.0501 0.414

Infinite

0.000

6644

2.289

0.462

10789039

0.001

22146

1.9422 0.392

Infinite

0.000

5916

2.170

0.438

Infinite

0.000

22449

1.8343 0.371

Infinite

0.000

5916

2.050

0.414

Infinite

0.000

20932

1.7264 0.349

Infinite

0.000

23936

1.930

0.390

Infinite

0.000

97775

1.6184 0.327

Infinite

0.000

182020

Fat Dam From Single Axles =

8.745

303367

Fat Dam From Tandem Axles =

0.865