Overview

Original Research

DYNAMIC SOIL STRUCTURE INTERACTION ANALYSIS OF HIGHRISE BUILDING SUPPORTED ON FINNED PILE-MAT FOUNDATION

Dr. BASAVANAGOWDA.G.M 1, M ROSHANA 2, PRADEEP C R 3.

Vol 18, No 08 ( 2023 )   |  DOI: 10.5281/zenodo.8363012   |   Author Affiliation: Assistant Professor, Department of Civil Engineering, MSRIT, Bangalore, India 1; P.G Research scholar, Department of Civil engineering, MSRIT, Bangalore, India. *Corresponding Author Email: roshana.manjunath0702@gmail.com 2; Assistant Professor, Department of Civil Engineering, Bangalore Institute of Technology, Bangalore, India 3.   |   Licensing: CC 4.0   |   Pg no: 1859-1880   |   Published on: 31-08-2023

Abstract

In a process known as Soil-Structure Interaction (SSI), the motion of the structure is impacted by the soil reaction

and vice versa. It has been believed that SSI enhances a building's capacity to respond to earthquakes. In order to

transfer building loads from shallow soil strata with poor bearing capacity to deeper soil strata with high bearing

capacity and stiffness, pile foundations are often employed. Compared to vertical loads, lateral loads are often

only partially resisted by piles. Thus, it is also necessary to enhance the lateral load bearing capability of piles. In

general, fins make the pile more rigid, which helps piles to resist greater lateral stresses than the typical approach.

It is exceedingly challenging to fully understand the behavior of fin piles using conventional soil pile theories

since they have various fin configurations. The purpose of the current study is to understand how regular pile mats

(RP-Mat) and finned pile mat foundations with different fin lengths of 6m & 18m behave under saturated and

unsaturated soil conditions when they are subjected to 1940 El-Centro earthquake ground motion. The threedimensional Finite element analysis ABAQUS 6.17 software was used to model these foundations. At various

floor levels, the peak acceleration, storey lateral displacement and Inter-storey drift values are compared for both

fin lengths under different soil conditions. Results of the study showed that when compared to RP mat, using a

finned pile mat proved more effective in decreasing the structural response. A better performance with respect to

reducing the seismic effects on the building and improving its stiffness was observed when the fin length was

increased Further, the 0.6Lp is proved to be the effective fin length which were shown satisfactory performance

when compared to other fin lengths

Keywords

Earthquake, Acceleration, lateral displacement, Inter-storey drift, Soil Structure interaction, Finned Pile-Mat