A study on design of piled raft foundation systems

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2013

Öğrenci: NURULLAH SÖNMEZ

Danışman: MEHMET UFUK ERGUN

Özet:

Design concepts and load sharing mechanism of piled raft foundations have been studied in this thesis. In the conventional piled foundations, the load transferred only by the piles and the piles are used for the reducing of both total and differential settlements and the contribution of the raft is generally disregarded. In the first part of the thesis, design approaches in the literature have been discussed. In the second part of the thesis, parametric analyses have been conducted for typical foundation in overconsolidated Ankara clay and finite element analyses have been done for Messe-Torhaus building in Frankfurt. Three dimensional analyses have been made by the widely used commercial software of Plaxis 3D and Sap2000, which solve the models by using the Finite Element Method. The foundation settlement and the load sharing between raft and pile have been investigated to identify the contribution of raft to the total capacity of piled raft foundations. The results showed that the raft can carry up to the 40% of the total applied load for an optimum number of piles for acceptable settlement levels.