Hits:

Indexed by:期刊论文

Date of Publication:2008-06-01

Journal:EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION

Included Journals:SCIE、EI

Volume:7

Issue:2

Page Number:217-224

ISSN No.:1671-3664

Key Words:adaptive element-free Galerkin method; soil liquefaction; large deformation; error estimation; seismic response

Abstract:An automatically adaptive element free method is presented to analyze the seismic response of liquefiable soils. The method is based on the element free Galerkin method (EFGM) and the fission procedure that is part of h-refinement, indicated by error estimation. In the proposed method, a posteriori error estimate procedure that depends on the energy norm of stress and the T-Belytschko (TB) stress recovery scheme is incorporated. The effective cyclic elasto-plastic constitutive model is used to describe the nonlinear behavior of the saturated soil. The governing equations are established by u-p formulation. The proposed method can effectively avoid the volumetric locking due to large deformation that usually occurs in numerical computations using the finite element method (FEM). The efficiency of the proposed method is demonstrated by evaluating the seismic response of an embankment and comparing it to results obtained through FEM. It is shown that the proposed method provides an accurate seismic analysis of saturated soil that includes the effects of liquefaction.