ANALYSIS AND IMPLEMENTATION OF RESILIENT MODULUS MODELS FOR GRANULAR SOLIDS

Constitutive equations based upon stress dependent moduli, like K-theta and Uzan-Witczak, are widely used to characterize the resilient response of granular materials for the analysis and design of pavement systems. These constitutive models are motivated by the observation that the granular layers used in pavement structures shake down to (nonlinear) elastic response under construction loads and will, therefore, respond elastically under service loads typically felt by these systems. Because of their simplicity, their great success in organizing the response data from cyclic triaxial tests, and their success relative to competing material models in predicting the behavior observed in the field, these resilient modulus constitutive models have been implemented in many computer programs used by researchers and design engineers. This paper provides an analysis of the nonlinear solution algorithms that have been used in implementing these models in a conventional nonlinear three-dimensional finite-element framework. The analysis shows that these conventional algorithms are destined to fail at higher load levels. The paper offers two competitive methods for global analysis with these models. A comparative study of eight possible implementations of the algorithms described in the paper is made through two simulation examples.

  • Availability:
  • Supplemental Notes:
    • This paper was prepared from a study conducted in the Center of Excellence for Airport Pavement Research, which is funded in part by the FAA under Research Grant Number 95-C-001.
  • Corporate Authors:

    American Society of Civil Engineers

    1801 Alexander Bell Drive
    Reston, VA  United States  20191-4400
  • Authors:
    • Hjelmstad, K D
    • Taciroglu, E
  • Publication Date: 2000-8

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00795784
  • Record Type: Publication
  • Contract Numbers: 10202592/31084/14500/323/01, NSC 87-2218-E009-021, 95-C-001
  • Files: TRIS
  • Created Date: Jul 31 2000 12:00AM