000011205 001__ 11205
000011205 005__ 20141205155846.0
000011205 04107 $$aeng
000011205 046__ $$k2008-10-12
000011205 100__ $$aOhya, Yousuke
000011205 24500 $$aFEM Model of Biot’s Equation Free from Volume Locking and Hourglass Instability

000011205 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000011205 260__ $$b
000011205 506__ $$arestricted
000011205 520__ $$2eng$$aA finite element modeling for liquefaction analysis that is free from volume locking and hourglass instability is proposed. Volume locking occurs when no or very small volume change is expected, which occurs under undrained condition or similar in liquefaction analysis, because bulk modulus of water is much larger than that of soil skeleton and volume of porewater hardly changes. On the other hand, hourglass instability occurs under excess reduced integration which is used to avoid volume locking. Proposed finite element formulation is based on so called u-U formulation, and different numerical integration schemes are employed for porewater and soil skeleton: ordinary integration for soil skeleton and reduced integration for all other element matrices. Numerical examples are made to evaluate effectiveness and accuracy of the proposed method by comparing other existing methods. The proposed method is shown to be accurate and also it is free from both volume locking and hourglass instability.

000011205 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000011205 653__ $$aliquefaction, effective stress analysis, volume locking, hourglass instability, finite element

000011205 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000011205 720__ $$aOhya, Yousuke$$iYoshida, Nozomu
000011205 8560_ $$ffischerc@itam.cas.cz
000011205 8564_ $$s206011$$uhttps://invenio.itam.cas.cz/record/11205/files/04-01-0014.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 04-01-0014.
000011205 962__ $$r9324
000011205 980__ $$aPAPER