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http://dx.doi.org/10.7843/kgs.2020.36.8.61

Analysis of Load Distribution Behavior in Vertical Extension Remodeling from Stiffness of Existing and Reinforcing Pile by Load Test  

Kim, Seok-Jung (Dept. of Infrastructure Safety Research, Korea Inst. of Civil Eng. and Building Tech.)
Wang, Cheng-Can (Dept. of Civil & Environmental Engrg., Univ. of Science & Technology)
Han, Jin-Tae (Dept. of Infrastructure Safety Research, Korea Inst. of Civil Eng. and Building Tech.)
Publication Information
Journal of the Korean Geotechnical Society / v.36, no.8, 2020 , pp. 61-72 More about this Journal
Abstract
It is generally considered that differences of axial stiffness between exiting pile and reinforcing pile affect the load distribution ratio during vertical extension remodeling. But there are few cases to verify the effect of stiffness by field load test on load distribution ratio in Korea. In this paper, a series of load tests for micropiles were carried out to evaluate the effect of axial stiffness on the load distribution ratio. First, different types of micropiles were constructed so that conventional micropiles simulated existing piles and waveform micropiles simulated reinforcing piles. Secondly, load tests were performed to evaluate the stiffness of each piles. After then, the raft was installed to make a piled raft system and load tests were applied on foundation to verify the effect of axial stiffness on the load distribution ratio. The experimental results show that the stiffness of waveform micropiles were 2.5 times larger than that of conventional micropiles, and the load distribution ratio between existing and reinforcing piles was increased according to axial stiffness of piles.
Keywords
Axial stiffness; Load distribution; Load test; Reinforcing pile; Vertical extension;
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Times Cited By KSCI : 10  (Citation Analysis)
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