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The IUP Journal of Structural Engineering

Piled Raft Foundation of Tall Buildings: A Parametric Study

Article Details

Pub. Date	: October, 2022
Product Name	: The IUP Journal of Structural Engineering
Product Type	: Article
Product Code	: IJSE041022
Author Name	: Riteshkumar and Rajendra J Thakai
Availability	: YES
Subject/Domain	: Science and Technology
Download Format	: PDF Format
No. of Pages	: 14

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Abstract

In construction, the foundation is accountable for effectively transferring the load of any structure to the subsoil, based on the soil's bearing capacity and settlement. Hard strata are frequently present at greater depths. Consequently, using a raft or piled foundation becomes a simple alternative. The raft foundation often compensates for low-bearing capacity, but for rafts bearing heavy loads, the settlements would exceed the permitted limitations. A raft may be supported on piles in order to control excessive settlements, and this type of foundation is generally known as Combined Piled Raft Foundation (CPRF). In this parametric study, an attempt has been made to analyze piled raft subjected to seismic loading conditions. The objective of this comparative study is to examine how the piled raft foundation behaves and performs when various factors such as pile diameter, pile length and modulus of sub-grade reaction of soil are altered, keeping thickness of raft and pile spacing to be constant. This aids in understanding the variation in total and differential settlement of the structure. ETABS and STAAD Foundation software were used to analyze the superstructure and substructure, respectively.

Introduction

The foundation is a key component of a building that transmits load from the superstructure to the soil. The high stress intensities borne by the columns and walls in the superstructure are substantially more than the carrying capability of the earth, which is much lower. Therefore, the footings can be thought of as an interface element to greatly reduce stress levels along the weaker soil; however, if loading is done on the underlying soil, the structure will increase stresses, resulting in a strain on the soil; this in turn, leads to