A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Impedance of pile shafts under axial vibratory loads
Abstract This paper describes analytical solutions for assessing the axial dynamic response of the shaft of a pile subjected to vibratory loads, with particular reference to pile vibratory driving. Radial inhomogeneity arising from shear modulus degradation is accounted for by assuming continuous variations of the medium properties. This approach alleviates wave reflections from the interface between inner (nonlinear) and outer (linear) zones. Novel analytical solutions are presented for two cases describing the radial decrease of the soil modulus according to (a) a linear law and (b) a parabolic law. The results are evaluated over a wide range of parameters and compared with those obtained by a semi-analytical model derived from Michaelides et al. [14,15] and by a radial discrete model simulating the pile and soil movements from integration of the laws of motion (Hipervib-II model) (Holeyman [8]).
Highlights ► Proposal of novel (semi-)analytical solutions to assess pile shafts axial impedance. ► Radial soil inhomogeneity arising from shear modulus degradation is accounted for. ► Smooth transition between low-strain and high-strain zones alleviates spurious wave reflections and resonance. ► Hysteretic soil behavior is considered. ► Sensitivity analyses highlight the differences between the various solutions.
Impedance of pile shafts under axial vibratory loads
Abstract This paper describes analytical solutions for assessing the axial dynamic response of the shaft of a pile subjected to vibratory loads, with particular reference to pile vibratory driving. Radial inhomogeneity arising from shear modulus degradation is accounted for by assuming continuous variations of the medium properties. This approach alleviates wave reflections from the interface between inner (nonlinear) and outer (linear) zones. Novel analytical solutions are presented for two cases describing the radial decrease of the soil modulus according to (a) a linear law and (b) a parabolic law. The results are evaluated over a wide range of parameters and compared with those obtained by a semi-analytical model derived from Michaelides et al. [14,15] and by a radial discrete model simulating the pile and soil movements from integration of the laws of motion (Hipervib-II model) (Holeyman [8]).
Highlights ► Proposal of novel (semi-)analytical solutions to assess pile shafts axial impedance. ► Radial soil inhomogeneity arising from shear modulus degradation is accounted for. ► Smooth transition between low-strain and high-strain zones alleviates spurious wave reflections and resonance. ► Hysteretic soil behavior is considered. ► Sensitivity analyses highlight the differences between the various solutions.
Impedance of pile shafts under axial vibratory loads
Holeyman, Alain (author) / Bertin, Renaud (author) / Whenham, Valérie (author)
Soil Dynamics and Earthquake Engineering ; 44 ; 115-126
2012-09-09
12 pages
Article (Journal)
Electronic Resource
English
Impedance of pile shafts under axial vibratory loads
| British Library Online Contents | 2013
Impedance of pile shafts under axial vibratory loads
| Online Contents | 2013
Stability of Drilled Shafts Under Earthquake Induced Axial Loads
| British Library Conference Proceedings | 1995
VIBRATORY PILE DRIVER WITH AN ADJUSTABLE DISTANCE BETWEEN THE SHAFTS OF ECCENTRIC MASSES
| European Patent Office | 2017
NTIS | 1963