Page 405 - Mechanics of Asphalt Microstructure and Micromechanics

Characterization and Modeling Anisotropic Proper ties of Asphalt Concrete 397

Effective Stress Distribution
E v =5E h E v =E h

E v =5E h Direct Stress in Y Direction E E v =E h

Vertical Displacement
E v =5E h E v =E h
FIGURE 12.3 Typical stress and vertical displacement distribution for the case of fi xed XYZ
(set 1 conditions).
only linear elasticity is involved, the configuration can be proportionally scaled to
larger sections. Table 12.1 presents the material inputs for the simulation. The simula-
tion mainly evaluates how the ratio between horizontal and vertical stiffness affects
the stress distribution and vertical displacements. The analysis is performed for five
elastic modulus ratios (E h /E v = 1, 0.8, 0.5, 0.2, 0.1).
Figures 12.3 and 12.4 present the comparisons of stresses and displacements at the
elastic modulus ratio of 0.2 for Set 1 and 2 boundary conditions, respectively. Other
cases are similar and the general trend is that the more significant the anisotropy, the