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Impedance Functions for Double-D Shaped Caisson Foundations

Dammala, Pradeep Kumar, Jalbi, Saleh, Bhattacharya, Suby, Adapa, Murali Krishna and Bouzid, Djillali Amar (2018) Impedance Functions for Double-D Shaped Caisson Foundations Journal of Testing and Evaluation, 47 (3).

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This article proposes solutions for stiffness estimation of Double-D shaped caisson foundations embedded in three different types of ground profiles (stiffness variation along the depth: homogeneous, linear and parabolic). The approach is based on three dimensional finite element analyses and is in line with the methodology adopted in Eurocode 8-Part 5 (2004)- lumped spring approach. The method of extraction of various stiffness values from the finite element model is described and followed by obtaining the closed form solutions. Parametric study revealed the nominal effect of embedment length of Double-D caisson and hence only the width and diameter effects are included in the suggested formulations. The obtained closed form solutions are presented in terms of multiplication factors for Double-D caissons. Final stiffness terms for a given width and diameter of a Double-D caisson can be conveniently estimated by multiplying the proposed formulations to the circular shaft solutions available in literature. Applicability of the proposed formulations is demonstrated by considering a typical bridge pier supported by Double-D caissons. The proposed formulations requires minimum amount of input parameters and can be used during the tender design to arrive at the required geometry of such foundations.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Dammala, Pradeep Kumar
Jalbi, Saleh
Adapa, Murali Krishna
Bouzid, Djillali Amar
Date : 1 November 2018
DOI : 10.1520/JTE20180075
Copyright Disclaimer : Copyright 2018 ASTM International
Uncontrolled Keywords : Closed form solutions; Double-D caissons; Plaxis 3D; Lumped springs
Depositing User : Melanie Hughes
Date Deposited : 15 Aug 2018 11:06
Last Modified : 16 Nov 2018 11:20

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