Journal Published Online: 01 November 2018
Volume 47, Issue 3

Impedance Functions for Double-D-Shaped Caisson Foundations

CODEN: JTEVAB

Abstract

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 the Eurocode 8—Part 5 (2004) lumped spring approach. The method of extraction of various stiffness values from the finite element model is described, followed by obtainment of the closed-form solutions. Parametric study revealed the nominal effect of the embedment length of Double-D caissons, and hence only the width and diameter effects are included in the suggested formulations. The obtained results are presented in terms of multiplication factors for Double-D caissons. Final impedance functions for a given width and diameter of a Double-D caisson can be conveniently estimated by multiplying the proposed functions to the circular shaft solutions available in literature. The applicability of the proposed formulations is demonstrated by considering a typical bridge pier supported by Double-D caissons. The proposed formulations require a minimum amount of input parameters and can be used during the tender design to arrive at the required geometry of such foundations.

Author Information

Dammala, Pradeep Kumar
Department of Civil and Environmental Engineering, University of Surrey, Guildford GU2, UK Civil Engineering Department, Indian Institute of Technology, Guwahati, India
Jalbi, Saleh
Department of Civil and Environmental Engineering, University of Surrey, Guildford GU2, UK
Murali Krishna, A.
Civil Engineering Department, Indian Institute of Technology, Guwahati, India
Bhattacharya, Subhamoy
Department of Civil and Environmental Engineering, University of Surrey, Guildford GU2, UK
Bouzid, Djillali Amar
Department of Civil Engineering, University of Blida, Route de Soumaa, Blida, Algeria
Pages: 20
Price: $25.00
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Details
Stock #: JTE20180075
ISSN: 0090-3973
DOI: 10.1520/JTE20180075