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http://dx.doi.org/10.7843/kgs.2018.34.1.47

Study on the Effectiveness of Preloading Method on Reinforcement of the Pile Foundation by 3D FEM Analysis  

Wang, Cheng-Can (Dep. of Geospace & Geotechnical Engrg., Univ. of Science & Technology)
Han, Jin-Tae (Korea Institute of Civil Engrg. and Building Technology)
Jang, Young-Eun (Dep. of Geospace & Geotechnical Engrg., Univ. of Science & Technology)
Ha, Ik-Soo (Dept. of Civil Engrg., Kyungnam Univ.)
Kim, Seok-Jung (Korea Institute of Civil Engrg. and Building Technology)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.1, 2018 , pp. 47-57 More about this Journal
Abstract
In recent years, vertical extension remodeling of apartment building is considered as one of the efficient ways to broaden and enhance the utilization of existing buildings due to the rapid development of population and decrement of land resources. The reinforcement of foundation is of great importance to bearing the additional load caused by the added floors. However, because of the additional load, the carried load by the existing piles would be in excess of its allowable bearing capacity. In this study, a conceptual construction method called preloading method was presented. The preloading method applies force onto the reinforcing pile before vertical extension construction. The purpose of preloading is to transfer partial load applied on the existing piles to reinforcing piles in order to keep each pile not exceeding the allowable capacity and to mobilize resistance of reinforcing pile by developing relative settlement. The feasibility and effect of preloading method was investigated by using finite numerical method. Two simulation models, foundation reinforcement with preloading and without preloading, were developed through PLAXIS 3D program. Numerical results showed that the presented preloading method is capable of sharing partial carried load of existing pile and develops the mobilization of reinforcing pile's frictional resistance.
Keywords
Vertical extension; Foundation reinforcement; Preloading method; Numerical analysis;
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