English  |  正體中文  |  简体中文  |  Items with full text/Total items : 63190/95884 (66%)
Visitors : 4625137      Online Users : 389
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/115554

    Title: Seismic response analysis of piled raft with grid-form deep mixing walls under strong earthquakes with performance-based design concerns
    Authors: Yamashita, Kiyoshi;Shigeno, Yoshimasa;Hamada, Junji;Chang, Der-Wen
    Keywords: Piled raft foundation;Soft ground;Deep mixing walls;Grid type;Strong earthquake;Three-dimensional FE analysis;Stabilized soil;Tensile failure;Performance-based design
    Date: 2018-02
    Issue Date: 2018-11-08 12:11:51 (UTC+8)
    Abstract: A seismic response analysis of a piled raft foundation combined with cement deep mixing walls (DMWs), supporting a 12-story base-isolated building under strong earthquakes, was conducted using a three-dimensional finite element model. To evaluate the induced internal stresses in the DMWs against their capacity, a nonlinear elastic model with tensile and shear criteria was applied for the stabilized soil. In order to verify the deformation parameters of the DMWs and the soil, a numerical simulation was carried out using the moderate earthquake motion recorded during the 2011 Tohoku Earthquake. As the strong earthquake motion, Level 2 earthquakes with a mean return period of approximately 500 years were generated using two sets of phase data. Four numerical cases were conducted considering the effects of the presence of the DMWs on the seismic response of the piled raft system. Based on the dynamic analysis results, it is seen that the bending moments near the pile head were decreased significantly by the DMWs. This occurred because the amplification of the lateral ground displacements below the raft was restrained by the DMWs, and the shear force acting at the pile head was very small because the lateral external force acting at the bottom of the raft was carried mostly by the DMWs. It is also seen that the amplification of the acceleration response spectra of the raft with DMWs was substantially lower than that of the raft without DMWs in long periods of 1–2 s. This is probably due to the difference in the kinematic interaction effects between the foundation and the soft soil. Tensile and shear failure occurred in the DMWs, and the extent of the tensile failure was dominant. Nevertheless, it was found that the grid-form DMWs were quite effective for reducing the sectional force of the piles to an acceptable level, even if such partial failure occurred. The DMWs could be designed more rationally by following the principles of a performance-based design (PBD), because minor damage to DMWs can be tolerated under strong earthquakes provided that the required foundation performance has been satisfied.
    Relation: Soils and Foundations 58(1), p.65-84
    DOI: 10.1016/j.sandf.2017.12.002
    Appears in Collections:[土木工程學系暨研究所] 期刊論文

    Files in This Item:

    File Description SizeFormat
    Seismic response analysis of piled raft with grid-form deep mixing walls under strong earthquakes with performance-based design concerns.pdf10937KbAdobe PDF2View/Open

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback