Shaking Table Tests of Dynamic Interaction of Soil-Structure Considering Soil Liquefaction

Abstract eng:
Shaking table model tests on soil-structure interaction system in liquefiable ground are described in this paper. A flexible container was fabricated to minimize the box effect. Pile foundation was used in the test. A 12-story cast-in-place R.C. frame model was used as superstructure, and sand soil was employed as model soil. In the tests, macro-phenomena of soil liquefaction and structure failure due to natural earthquake were reproduced well. The natural frequency of interaction system decreased and the damping ratio of soil increased with the increase of the shaking. The liquefied soil could filter and isolated vibration. The phenomena of transient minus pore pressure occurred in the test. Pore water pressure did not always dissipate in short time immediately after the excitations, but it may keep on increasing too. The distribution of the strain amplitude along the pile was the shape where the large strain was at the top of the pile and the small strain was at the tip of the pile. And the distribution of the contact pressure on the pile-soil interface was related to the excitation magnitude. sand soil, liquefaction, interaction, shaking table test, seismic response

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