Influence of Ground Properties on Seismic Response of Tower Cranes Supported by Pile Foundations

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  • TAMATE Satoshi
    Construction Safety Research Group, National Institute of Occupational Safety and Health
  • TOYOSAWA Yasuo
    Construction Safety Research Group, National Institute of Occupational Safety and Health
  • TAKANASHI Seiji
    Construction Safety Research Group, National Institute of Occupational Safety and Health
  • ITOH Kazuya
    Construction Safety Research Group, National Institute of Occupational Safety and Health
  • SUEMASA Naoaki
    Faculty of Engineering, Musashi Institute of Technology
  • KATADA Toshiyuki
    Faculty of Engineering, Musashi Institute of Technology
  • TANAKA Tsuyoshi
    Faculty of Engineering, Musashi Institute of Technology
  • ARAI Fumitaka
    Faculty of Engineering, Musashi Institute of Technology

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Other Title
  • 杭基礎で支持されたタワークレーンの地震時応答に与える設置地盤の影響
  • クイ キソ デ シジサレタ タワー クレーン ノ ジシンジ オウトウ ニ アタエル セッチ ジバン ノ エイキョウ

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Abstract

Pile foundations are built under the ground to support the high-rise structure of tower cranes. Acting loads in the foundations reach higher values because of a heavy self weight. In addition, drag forces due to strong wind and inertia forces due to seismic accelerations are also important factors in designing the foundations. Tower cranes become quite unstable during strong ground motion because of their tall structures and top-heavy distributions. Centrifuge model tests were carried out to investigate the dynamic interaction between the tower crane structures comprising the pile foundations and the supporting ground. Three different types of model ground were produced with Toyoura sand, Fujinomori clay and Kanto loam to simulate different relationships between load and displacement in the piles. Two types of moment conditions during operations of tower cranes were also used in the model crane to investigate the response in both the unbalanced condition by hooking the net rated load and the balance condition without the hook load. The experimental results show that the soil properties of the ground are the most important factors in the seismic response of tower cranes. It was also confirmed that the moment conditions also change the distribution of bending moment as well as axial loads in the bottom of piles. Accordingly, the soil properties of the ground must be investigated to ensure safety in terms of strong earthquakes prior to installations of tower cranes supported by pile foundations. The different moment conditions must be considered in evaluation of seismic stability.

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