Behaviour of pile foundation of G+5 buildings on various soil types of Guwahati at regional scale
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ORIGINAL PAPER
Behaviour of pile foundation of G+5 buildings on various soil types of Guwahati at regional scale Nabanita Sharma 1 & Diganta Goswami 1 & Jayanta Pathak 1 Received: 5 June 2020 / Accepted: 11 September 2020 # Saudi Society for Geosciences 2020
Abstract The paper presents the results of a parametric study of static and dynamic response of pile groups of G+5 buildings of Guwahati, the capital city of Assam situated in India. Based on a preliminary survey conducted on 500 buildings of the city, it is observed that most of the buildings under survey are G+5 buildings. Guwahati, being a hub of erratic topography, consists of varied soil types. These soil types are grouped into various geo-units on the basis of their grain size distribution obtained from the geotechnical investigations at around 600 boreholes within the city. The study is conducted by modelling a representative G+ 5 building with piles, grouped in five, fixed at the head by pile caps and embedded in a homogeneous soil stratum in a finite element formulating software, PLAXIS 3D. The results are presented in the form of comprehensive plots, and a comparative study is made to obtain the pattern of pile behaviour, in terms of deflection, bending moment and shear force, in various geo-units of Guwahati. The paper gives an insight to the pile designers of the region, an estimation of the maximum seismically induced deflection, bending moment and shear strength of the pile to maintain the structural integrity of the pile, when the pile is embedded in different types of soil of Guwahati. Keywords Bending moment . Displacement . Guwahati . Shear force . Soil
Introduction During earthquakes, the amplitude, frequency and period of ground motion that reaches the foundation are influenced by the surrounding soil of the foundation system. To assess the response of a superstructure and its substructure during earthquakes, it is important to know about the engineering properties of the surrounding soil. Pile foundations are widely used in multi-storeyed buildings, as they transfer heavy loads from the superstructure to the deep stratum of underlying soil, by end-bearing or skin friction. In occurrence of seismic events, Responsible Editor: Zeynal Abiddin Erguler * Nabanita Sharma [email protected] Diganta Goswami [email protected] Jayanta Pathak [email protected] 1
Department of Civil Engineering, Assam Engineering College, Guwahati, Assam 781013, India
these pile foundations are subjected to additional dynamic loads coming from the surrounding soil, along with the static load of the superstructure. Designing pile foundations for resisting these additional loads requires limiting the values of pile response to suitable values for safe functioning of the superstructure. Thus, the response of pile foundations and the adjoining soil should be thoroughly studied for safe design of a foundation system. Several researchers, through various methods, have studied the influence of surrounding soil on a pile foundation system. Matlock and
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