Department: Structural Engineering
Name: Jinchi Lu
Email: jinlu @ ucsd.edu
Grad Year: 2006
This research addresses the seismic analysis of a pile-supported wharf system with configurations typical of waterfront structures at the Port of Los Angeles. The primary objective of this numerical study is to investigate and shed light on the underlying dynamic response mechanisms, including soil-structure interaction, of a wharf with a typical geometric configuration.
The analyses were conducted on Datastar at San Diego Supercomputer Center (SDSC), using ParCYCLIC, a newly developed nonlinear parallel finite element program for earthquake ground/structure response and liquefaction simulation. In ParCYCLIC, finite elements are employed within an incremental plasticity, coupled solid-fluid formulation. A constitutive model calibrated by physical tests represents the salient characteristics of sand liquefaction and associated accumulation of shear deformations. Key elements of the computational strategy employed in ParCYCLIC include the development of a parallel sparse direct solver, the deployment of an automatic domain decomposer, and the use of the Multilevel Nested Dissection algorithm for ordering of the finite element nodes.
The dynamic soil-structure interaction of a pile-supported wharf system is a complex process. Large-scale modeling on parallel computers can provide a better understanding of its seismic behavior. It was found that 3D modeling may shed more light than 2D plane strain modeling in simulating a wharf system.
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