Piled raft foundation is a composite construction consisting of three elements, piles, raft and subsoil. It has been commonly used for the foundation of high rise building in recent year. The combined effect of piles and raft can reduce the maximum and differential settlement and it can lead to more economical foundation design as compare to the conventional pile foundation. This paper focus on the settlement of piled raft foundation of a high-rise building resting on sandy soil in Yangon area. The critical column load of superstructure is obtained by using ETABs software and loading consideration for superstructure is based on UBC -97. Soil type is sandy soil and the upper soil layer where the raft located is sandy silt. This study considered the type of bored pile and the allowable bearing capacity is calculated by Hansen’s method, Tomlison’s methods and Meyerhof ? s Rule of Thumb method. The simplified analysis is made by Poulos – Davis - Randolph (PDR) method to estimate the load –settlement curve and load distribution between piled and raft. The piled raft foundation is analyzed by SAFE software, in which the raft is modelled as a thin plate and the piles and soils are treated as springs. In this study, a parametric study is made on raft thickness, pile length and number of piles. The increase in raft thickness do not have much significant effect in reducing maximum and differential settlement but it is uneconomical due to increasing of moment. The maximum settlement is reduced by increasing pile length and number of piles.
Title = "Parametric Study on the Settlement of Piled Raft Foundation for High-Rise Building",
Journal ="International Journal of Science and Engineering Applications (IJSEA)",
Volume = "7",
Pages ="331 - 410",
Year = "2018",
Authors ="Pwint Wai Wai Aung, Nyan Phone, Kyaw Lin Htat"}