000012232 001__ 12232
000012232 005__ 20141205160033.0
000012232 04107 $$aeng
000012232 046__ $$k2008-10-12
000012232 100__ $$aYoshida, Nozomu
000012232 24500 $$aSimplified Method in Evaluating Liquefaction Occurrence Against Huge Ocean Trench Earthquake

000012232 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000012232 260__ $$b
000012232 506__ $$arestricted
000012232 520__ $$2eng$$aEffectiveness of the existing simplified method for evaluating liquefaction potential under ocean trench long duration earthquakes is investigated. Effective stress analyses are made at more than 200 sites. Accuracy of the existing simplified method is evaluated by comparing the onset of liquefaction by both methods. It is found that existing method is applicable to a near field or inland earthquake but not to an ocean trench earthquake and that it overestimate liquefaction potential resulting in dangerous design although PGA is smaller in ocean trench earthquake. It comes from the difference of effective number of loading cycles; that for ocean trench earthquake is about 10 times larger than that considered in the existing method. Then a correction factor is proposed for liquefaction strength; liquefaction strength is set about a half of that used in the existing method. This method works so that both dangerous ratio (ratio of the cases where onset of liquefaction is identified by effective stress analysis but is not by existing simplified procedure) and accuracy ratio (ratio where both effective stress and simplified method show same result) keep nearly the same as for the case of the inland earthquake.

000012232 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000012232 653__ $$aliquefaction, ocean trench earthquake, simplified method, duration

000012232 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000012232 720__ $$aYoshida, Nozomu$$iSawada, Sumio$$iNakamura, Susumu
000012232 8560_ $$ffischerc@itam.cas.cz
000012232 8564_ $$s1053351$$uhttps://invenio.itam.cas.cz/record/12232/files/04-02-0011.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 04-02-0011.
000012232 962__ $$r9324
000012232 980__ $$aPAPER