Structural Design of Pavements
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1 CAIRO UNIVERSITY FACULTY OF ENGINEERING PUBLIC WORKS DEPARTMENT 4 th Year Civil Engineering Highway Engineering Course Structural Design of Pavements Lecturer Dr. Eng. Omar Osman Asst. Professor of Highway & Airport Engineering Faculty of Engineering, Cairo University
2 Structural Design of Pavements II- Rigid Pavements - Materials - Stresses - Design Methods
3 Pavement Types -Flexible -Rigid
4 Factors Influencing Pavement Design/Performance
5 Critical Concrete Pavement Responses: Distresses Faulting Cracks Corner Breaks Joint Failure
6 RIGID PAVEMENT TYPES a) Simply Reinforced b) doweled c) plain d) skewed joints
7 JOINT TYPES Expansion: Doweled Contraction: Keyed Construction: Doweled Construction:
8 JOINT TYPES
9 STRUCTURAL SYSTEM
10 STRUCTURAL SYSTEM SUBGRADE SUPPORT Modulus of Subgrade Reaction: k (pci)
11 STRUCTURAL SYSTEM Radius of Relative Stiffness [25~98 inch] [8~24 inch] [0.15] [50~500 pci] [4,000,000 psi]
12 STRESSES IN RIGID PAVEMENTS Temperature: Warping Stresses
13 Temperature: Warping Stresses [ ] [2~3 ºF/inch]
14 Temperature: Warping Stresses
15 STRESSES IN RIGID PAVEMENTS Temperature: Friction Stresses [1.5]
16 Temperature: Friction Stresses Slab Length
17 STRESSES IN RIGID PAVEMENTS Loading Wheel Loads & Stresses
18 STRESSES IN RIGID PAVEMENTS Loading Cases
19 STRESSES IN RIGID PAVEMENTS Loading Stresses
20 STRESSES IN RIGID PAVEMENTS Loading Stresses
21 PCA Design Method Design Considerations: Flextural Strength of Concrete Subgrade & Subbase Support Traffic Load Design Procedure: Finite-element analysis: Stresses & Deflections Fatigue analysis (crack initiation) Erosion analysis (Pumping, Faulting)
22 PCA Design Method Flextural Strength of Concrete (modulus of rupture) ASTM C78 Third-point method P L / (w d 2 )
23 PCA Design Method Subgrade Characterization
24 PCA Design Method Subbase Support: Correction of Modulus of sub grade reaction (K) associated with agg. subbase thickness.
25 PCA Design Method Traffic Axle configuration and loads: Classes & Counts Load factors Interstate: 1.2 Arterial: 1.1 Local access: 1.0
26 PCA Design Method Fatigue analysis To limit fatigue cracking (initiation of first crack) Determine equivalent stress associate with sub grade reaction and pavement thickness Determine stress ratio = equivalent stress/mor Determine allowable number of stress application at the given axel load and stress ratio Repeat for all axel loads Calculate the % fatigue life used for each applied load. The sum for all loads must be less then 100%. Erosion analysis Basically the same method is used as in the fatigue analysis. Limiting corner deflections is the target.
27 PCA Method Fatigue Analysis, Equiv. Stress; No Shoulder
28 PCA Method Fatigue Analysis, Equiv. Stress; With Shoulder
29 PCA Method Fatigue Analysis, Allowable Repetitions
30 PCA Method Erosion Analysis, Erosion Factor; Doweled No Shoulder
31 PCA Method Erosion Analysis, Erosion Factor; Agg Interlock No Shldr
32 PCA Method Erosion Analysis, Erosion Factor; Doweled & Shoulder
33 PCA Method Erosion Analysis, Erosion Factor; Agg Interlock & Shldr
34 PCA Method Erosion Analysis, Allowable Repetitions No Shoulder
35 PCA Method Erosion Analysis, Allowable Repetitions With Shoulder
36 PCA Method Thickness Design Example
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