Design example

1. 3 2
2 310
52 50
30000 0.8
0.15 180.61
16.6 0.22
4.22 157
Case 1 Case 2
850.6912883
Cummulative fatigue damage 0.0671825
stress ratio 0.568720379
Allowable repetititons 5020350.936
Design is Safe
stresses due to temparature,σ, Mpa 0.17
negative stress due to nonlinear temparature diffrential,σ, Mpa 0.42
Total stress for Fatigue calculation,σ, Mpa 2.4
Stresses due to wheel load,σ, Mpa 2.65
Ratio of L/l 2.20
Correction factor C 0.07
Design is
RESULTS FOR FATIGUE ANALYSIS
Case 3
Design No.of vehicles for fatigue analysis 337279.7286
Stress developed, σ, Mpa Wheel load Stresses at edge, Mpa
Design is Total stresses, σ, Mpa
RESULTS FOR ONLY WHEEL LOAD CONSIDERATION RESULTS FOR WHEEL LOAD AND TEMPARATURE
Radius of relative stiffness, l mm temparature stress at edge, Mpa
Temperature differntial, ∆T oC Trial thickness, h m Rate of increase of traffic 0.06
Modulus of rupture of concrete, fcr No. of commercial vehicels per day
Truck with 50kN Wheel load,% 16
Elastic modulus of concrete E, Mpa Tyre pressure, q MPa Correction factor C 0.07
Poisson Ratio of the concrete, µ Radius of contact, a (mm) Design life of pavement, yrs 20
Temperature Zone (1 to 6) Spacing of wheels Sd (mm)
Ratio of L/l 2.20
Modulus of the subgrade reaction, k Mpa/m wheel load, P kN Co‐efficient of thermal expansion 0.00001
DESIGN OF CONCRETE PAVEMENTS FOR RURAL ROADS AS PER IRC:SP 62‐2014.
Case 1 Only wheel load stress : Case 2 Temperature and wheel load stresses without fatigue: Case 3
fatigue analysis considering load and temperature
Enter the Data
Case 1 /2/3 Tyre (1‐ single/2 ‐ dual) Transverse joint spacing,m 1.875