Assessment of “Piled Raft Foundation” for HighRise Buildings Under Vertical Load in Addis Ababa: The case of Nib, Zemen, and United Bank Headquarter Buildings
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Date
2018-06
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Addis Ababa University
Abstract
Piled Raft foundation is a newly emerged foundation system. Different
researchers are working on it till now. The system is mainly used to respond to
weak foundation materials.
The intent of this study is, to assess the piled-raft foundations of high-rise
buildings under vertical load. These foundations are designed by local engineers
to respond to high-rise building foundation requirement. The study is conducted
using finite element method software package – ABAQUS.
The numbers of projects considered in this study are three. They have similar
nature and are under construction. The designers use similar pile spacing for all
projects and it is the only variable parameter in this study. The foundations are
modeled with pile spacing of 3D (designers spacing) and 6D (two times designers
spacing).
The site's geology is predominantly rocky but in different weathered condition.
The assessment result shows maximum and differential settlement of the
foundations are very insignificant and angular distortion is within permissible
limit. Almost all the vertical load is taken by the pile and the load shared by the
raft is very insignificant.
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Keywords
Piled Raft Foundation, High Rise Buildings, Vertical Load