Interactive behavior of soil–pile-superstructure system in transient state to liquefaction by means of large shake table tests |
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Authors: | Shintaro Yao Koichi Kobayashi Nozomu Yoshida Hiroshi Matsuo |
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Affiliation: | a Faculty of Engineering, Kansai University, Yamate-cho, Suita-shi, Osaka 564-8680, Japan;b Engineering Division, Geotop Corporation, Shinkawa 1-16-6, Chuo-ku, Tokyo 104-0033, Japan;c Earthquake Engineering Center, Oyo Corporation, Toro 2-61-5, Kita-ku, Saitama 331-8688, Japan;d Tokyo Branch, Takenaka Corporation, Ginza 21-1-18, Chou-ku, Tokyo 104-8182, Japan |
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Abstract: | Shaking table tests were conducted by means of a large-scale laminar box with 4 m in length, 2 m in width and 2 m in height in order to investigate behavior of a soil-pile-superstructure system in liquefiable ground. A model two-storey structure, supported by a pile group, was set in a saturated sand deposit, and subjected to a sinusoidal base motion with increasing amplitude. Discussions are focused on the transient behavior until soil liquefaction occurs. Main interests are characteristics of springs used in a sway-rocking model and a multi-freedom lumped mass (MFLM) model that are frequently used in soil–pile interaction analysis. The spring constant in the sway-rocking model is represented by restoring force characteristics at the pile head, and that in the MFLM system is represented by an interaction spring connecting the pile to the free field. The transient state prior to soil liquefaction is shown to be important in the design of a pile because dynamic earth pressure shows peak response in this state. The reduction of the stiffness due to excess porewater generation and strain dependent nonlinear behavior is evaluated. |
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Keywords: | Author Keywords: Liquefaction Shake table Pile foundation Dynamic soil– pile interaction |
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