Pavement Structural Analysis in Two-Layer Systems: Vertical Surface Deflection
Exploring the concept of vertical surface deflection as a criterion for pavement design in two-layer systems, considering factors such as modulus ratio, thickness radius ratio, and solving steps. An example scenario involving a total load application on a two-layer system through a rigid plate is discussed to illustrate practical application.
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Pavement Structural Analysis Two-Layer Systems (Vertical surface deflection) Highway and Transportation Engineering Al-Mustansiriyah University 2020-2021 Dr. Abeer K. Jameel Dr. Rana Amir Yousif Yoder; E. J. and M. W. Witczak, Principles of Pavement Design , A Wiley- Interscience Publication, John Wiley & Sons Inc., U.S.A., 1975.
References Nicholas J. Garber and Lester A. Hoel. Traffic and Highway Engineering , Fourth Edition. Yoder; E. J. and M. W. Witczak, Principles of Pavement Design , A Wiley- Interscience Publication, John Wiley & Sons Inc., U.S.A., 1975. Yaug H. Huang, Pavement Analysis and Design , Prentic Hall Inc., U.S.A., 1993. AASHTO Guide for Design of Pavement Structures 1993 , AASHTO, American Association of State Highway and Transportation Officials, U.S.A., 1993. Oglesby Clarkson H., HighwayEngineering , John Wiley & Sons Inc., U.S.A., 1975. Yoder; E. J. and M. W. Witczak, Principles of Pavement Design , A Wiley- Interscience Publication, John Wiley & Sons Inc., U.S.A., 1975.
Two-Layer Systems Vertical Surface Deflection: Vertical surface deflections have been used as a criterion of pavement design. (2.14) for Flexible Plate (2.15) for Rigid Plate Yoder; E. J. and M. W. Witczak, Principles of Pavement Design , A Wiley- Interscience Publication, John Wiley & Sons Inc., U.S.A., 1975.
Two-Layer Systems (Vertical Surface Deflection( The deflection factor is a function of: 1. The modulus ratio El/E2. 2. Thickness radius ratio h1/a. Yoder; E. J. and M. W. Witczak, Principles of Pavement Design , A Wiley- Interscience Publication, John Wiley & Sons Inc., U.S.A., 1975.
Two-Layer Systems (Vertical Surface Deflection) Steps to Solve Two-Layer Systems (Vertical Surface Deflection): Step 1 Find value. Find value. Yoder; E. J. and M. W. Witczak, Principles of Pavement Design , A Wiley- Interscience Publication, John Wiley & Sons Inc., U.S.A., 1975.
Two-Layer Systems (Vertical Surface Deflection) Steps to Solve Two-Layer Systems: Step 2 As example (if = 4 and = 5 0) from Figure 2.17 please follow the chart Then can obtain. 2 Yoder; E. J. and M. W. Witczak, Principles of Pavement Design , A Wiley- Interscience Publication, John Wiley & Sons Inc., U.S.A., 1975.
Two-Layer Systems (Vertical Surface Deflection) Example: A total load of 20,000 lb (89 kN) was applied on the surface of a two-layer system through a rigid plate 12 in. (305 mm) in diameter, as shown in Figure 2 .18 . Layer 1 has a thickness of 8 in . (203 mm) and layer 2 has an elastic modulus of 6400 psi (44 .2 MPa). Both layers are incompressible with a Poisson ratio of 0.5 . If the deflection of the plate is 0.1 in . (2 .54 mm), determine the elastic modulus of layer 1? Yoder; E. J. and M. W. Witczak, Principles of Pavement Design , A Wiley- Interscience Publication, John Wiley & Sons Inc., U.S.A., 1975.
Two-Layer Systems Solution: The average pressure on the plate is From Eq. 2.15 , From Figure (2.17), Yoder; E. J. and M. W. Witczak, Principles of Pavement Design , A Wiley- Interscience Publication, John Wiley & Sons Inc., U.S.A., 1975.
Two-Layer Systems Dr. Rana Amir Yousif & Dr. Abeer K. Jameel Yoder; E. J. and M. W. Witczak, Principles of Pavement Design , A Wiley- Interscience Publication, John Wiley & Sons Inc., U.S.A., 1975.
