|
| Study on numerical algorithm of 3D meso-mechanics model of dam concrete |
| Revised:March 15, 2006 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20082046 |
| KeyWord:dam concrete,three dimensional random aggregate,preconditioner,multi-scaled method,parallel algorithm |
| MA Huai-fa CHEN Hou-qun WU Jian-ping LI Bao-kun |
|
| Hits: 1411 |
| Download times: 12 |
| Abstract: |
| On the meso-mechanics level the dam concrete is taken as the composite material consisting of aggregate,mortar and interface between them.A 3-dimensional finite element model of the dam concrete specimen is generated with consideration of damage evolutionary processes and strain-rate effects of the different media.The numerical computing algorithm and its FORTRAN serial program on PC computer for the nonlinear dynamic analysis of dam concrete were developed.The loading procedure can be controlled either by load or by displacement.In order to reduce the degree of freedom of the system,an artificial medium with mechanical properties equivalent to the composite media of the mortar and the finest aggregates were involved by using multi-scaled method.The numerical analyses for the specimens both of wet-sieved and full-graded dam concrete were carried out to investigate the failure processes under static and dynamic shock loading.The analytical results verified that the applied algorithm and its computer program are correct and effective.Based on the serial program,by using memory optimization for stiffness matrix and conjugate gradient(CG) algorithm with the preconditioner of incomplete Cholesky factorization with double threshold(ICT),the parallel program for Sun Fire 6800 server was developed.The computing efficiency was raised remarkably. |
|
|
|