000020144 001__ 20144
000020144 005__ 20170118182356.0
000020144 04107 $$aeng
000020144 046__ $$k2017-01-09
000020144 100__ $$aHideki, Inatani
000020144 24500 $$aS-Wave Impedance Measurements of the Uppermost Material in Surface Ground Layers

000020144 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000020144 260__ $$b
000020144 506__ $$arestricted
000020144 520__ $$2eng$$aS-wave impedance is one of the most effective parameters used to study the ground motion amplification of soil deposits. We propose a new approach to measure the S-wave impedance of the uppermost material in surface ground layers. First, a circular disk is set on the ground surface, and it is vertically loaded by sinusoidal wave excitation. When the time series of the loading velocity is synchronized with the reaction force, the ratio of the reaction force to the loading velocity is proportional to the S-wave impedance. We then estimate the proportionality coefficient from numerical experiments and check its accuracy. The measurement error is estimated to be within 1% for the homogeneous half-space case. We also discuss the applicability of this new approach and its limitations on the bases of numerical experiments for inhomogeneous media: a two-layered medium and a one-dimensional (1-D) random medium. The proposed approach is effective for both cases if we select the appropriate circular disk size.

000020144 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000020144 653__ $$aS-wave impedance; Site amplification; Geophysical exploration method

000020144 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000020144 720__ $$aHideki, Inatani$$iSumio, Sawada$$iNobuaki, Tanaka$$iHiroyuki, Goto
000020144 8560_ $$ffischerc@itam.cas.cz
000020144 8564_ $$s636625$$uhttps://invenio.itam.cas.cz/record/20144/files/636.pdf$$yOriginal version of the author's contribution as presented on USB, paper 636.
000020144 962__ $$r16048
000020144 980__ $$aPAPER