Implementation of a User Material Routine in 3D （实现用户材料常规3 d）.pdf

Implementation of a User Material Routine in 3D-FE Codes for Viscoelastic Modeling and Simulation of Highway and Airport Pavements W. Uddin, Assistant Professor L. Ricalde , Graduate Assistant Department of Civil Engineering The University of Mississippi University, Mississippi 38677 Voice (662) 915-5363 Fax (662) 915-5523 cvuddin@olemiss.edu Abbreviations: 3D-FE Three Dimensional-Finite Element A Nondimensional A Parameter AASHTO American Association of State Highways and Transportation Officials ADCP Automated Dynamic Cone Penetrometer BULK Bulk Modulus CR0 Initial Crack Size ESAL Equivalent Standard Axle Load ESWL Equivalent Single Wheel Load FHWA Federal Highway Administration FWD Falling Weight Deflectometer G Shear Modulus GAO General Accounting Office MDOT Mississippi Department of Transportation PEDD Pavement Evaluation Based on Dynamic Deflections TAU or Relaxation Time UMAT User Material Subroutine VMAX Limiting Value of Average Crack Radius Growth Rate XKT Threshold Value of Stress Intensity XM Stress Intensity Parameter XMU or S Static Coefficient of Friction Keywords: Pavement, finite element, simulation, material, model, elastic, viscoelastic 6-11 ABSTRACT Traditional static analysis procedures using linear elastic pavement properties may lead to incorrect structural response ana