Impact of Truck Loading on Design and Analysis of Asphaltic Pavement Structures : Phase III
-
2012-03-01
-
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Edition:Final report; July 2010-Mar. 2012.
-
Corporate Publisher:
-
Abstract:This study investigated the impact of the realistic constitutive material behavior of asphalt layer (both nonlinear inelastic
and fracture) for the prediction of pavement performance. To this end, this study utilized a cohesive zone model to consider
the fracture behavior of asphalt mixtures at an intermediate temperature condition. The semi-circular bend (SCB) fracture
test was conducted to characterize the fracture properties of asphalt mixtures. Fracture properties were then used to
simulate mechanical responses of pavement structures. In addition, Schapery’s nonlinear viscoelastic constitutive model
was implemented into the commercial finite element software ABAQUS via a user defined subroutine (user material, or
UMAT) to analyze asphalt pavement subjected to heavy truck loads. Extensive creep-recovery tests were conducted at
various stress levels and multiple service temperatures to obtain the stress- and temperature-dependent viscoelastic material
properties of asphalt mixtures. Utilizing the derived viscoelastic and fracture properties and the UMAT code, a typical
pavement structure was modeled that simulated the effect of material nonlinearity and damage due to repeated heavy truck
loads. Two-dimensional finite element simulations of the pavement structure demonstrated significant differences between
the cases: linear viscoelastic and nonlinear viscoelastic modeling with and without fracture in the prediction of pavement
performance. The differences between the cases were considered significant, and should be addressed during the process of
performance-based pavement design. This research demonstrates the importance of accurate and more realistic
characterizations of pavement materials.
-
Format:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type: