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The design parameters include the SSI with three types of soil and raft thickness.
The effect of flexibility of soil, stiffness of raft of piled raft foundation, slenderness ratio of chimney and of chimney elevation on the above variation is studied.
Since the building is located on loose silty sand, underlain by soft cohesive soil, a piled raft with grid-form deep cement mixing walls was employed to cope with the liquefiable sand as well as to improve the bearing capacity of the raft foundation.
The effect of SSI was studied by considering different parameters such as flexibility of soil, stiffness of the raft of piled raft foundation, slenderness ratio of the chimney and chimney elevation.
In this paper, 6-story and 12-story building models are studied with two different modeling approaches: the first modeling approach includes raft foundation, soil and super-structure interaction (SSI model), while the second modeling approach considers over-ground portion of building based on fixed base-rigid foundation/rigid soil hypothesis (NSSI model/fixed base model).
As the raft foundation underneath soil flexibly causes the increase of story drift ratio.
The linear elastic material behaviour of chimney, piled raft and the soil was assumed.
The settlement behavior of a square piled raft in clay soil was investigated using numerical analysis.
An interactive design method that takes into account the coupling between the stiffness of the superstructure, the piled raft and the soil has been proposed for analyzing the response of building structure.
The nodes at the interface of bottom of raft and top of soil were completely coupled.
The story drift ration increase for flexible raft foundation and as the underneath soil condition changes from stiff to soft soil.
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