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SUMMARY:Large scale modeling seismic soil-pile-structure interaction - Ben
  Zhao\, National University of Singapore
DTSTART:20100219T163000Z
DTEND:20100219T173000Z
UID:TALK22705@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:Abstract: This presentation discusses a parallel dynamic code 
 which is developed to analyse large-scale seismic soil-pile-structure inte
 raction problems. The dynamic program is developed as part of research pro
 gramme aimed at studying the effects of earthquakes on pile foundations in
  soft clay layers. Other aspects of the programme\, such as centrifuge mod
 el testing\, cyclic triaxial and resonant column tests as well as constitu
 tive modeling work will also be briefly outlined. The dynamic code is deve
 loped from the source code of a static analysis software GeoFEA. The devel
 opment work includes modifying the code so that very large problems can be
  domain-decomposed and analysed on a number of PCs connected via a 10 Gbit
 s/sec high-speed switch. Data transfer between PCs is effected using MPI p
 rotocol. Within a single PC\, multiple cores can also be used by underlayi
 ng the MPI scheme with a hyperthreading scheme\, implemented using OpenMP.
  The parallel scheme is implemented on an element-by-element iterative sol
 ution algorithm which obviates the assembly of the global stiffness matrix
  and can be parallelized readily. This drastically reduces memory requirem
 ents. By using multiple PCs on a problem\, calculation time is also signif
 icantly reduced. This allows very large problems involving millions of deg
 rees-of-freedom to be studied using a cluster of relatively inexpensive PC
 s. The program is verified by comparison with centrifuge model and ABAQUS 
 results on soil-pile-raft interaction. Then two large scale models are ana
 lyzed to simulate the seismic soil-pile-structure interaction.
LOCATION:Engineering Department - LR6
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