Abstract
This paper presents an analytical solution for determining the time-harmonic response of single open-ended pipe piles subjected to vertically propagating seismic P-waves. Following the presentation of the formulation, we employ the solution to derive closed-form expressions of seismic pipe pile displacements, as well as robust expressions to determine the depth- and frequency-dependent parameters of complex Winkler springs, for use with beam-on-dynamic-Winkler-foundation models. Finally, the importance of considering the contribution of the inner soil in the seismic analysis of pipe piles is quantified via a parametric sensitivity analysis.
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Abbreviations
- a 1 :
-
Dimensionless frequency
- A ~ D, A n :
-
Undetermined coefficients
- A p :
-
Cross-sectional area of pipe pile
- c 1 :
-
Damping coefficient of outer soil
- c 2 :
-
Damping coefficient of inner soil
- E p :
-
Young’s modulus of pile
- f :
-
Vertical soil resistance
- H :
-
Pile length
- I v :
-
Kinematic response factor
- \( I_{0} \left( {} \right) \) :
-
The first kind of zero-order modified Bessel function
- k 1 :
-
Dynamic stiffness of outer soil
- k 2 :
-
Dynamic stiffness of inner soil
- K :
-
Winkler modulus of soil
- r, \( \theta \), z :
-
Radial, circumferential and vertical directions in the cylindrical coordinate system
- r 1 :
-
Pile outer radius
- r 2 :
-
Pile inner radius
- Subscripts 1 and 2:
-
Parameters referring to outer and inner soil respectively
- t :
-
Time
- u :
-
Vertical displacement of soil
- u g :
-
Amplitude of seismic wave
- u p :
-
Vertical displacement of pipe pile
- u r p :
-
Relative displacement of pipe pile to rigid base
- u r :
-
Relative displacement of soil to rigid base
- V p :
-
One-dimensional wave propagation velocity in pipe pile
- \( u_{g} \text{e}^{{\text{i} \omega t}} \) :
-
Time-harmonic displacement
- \( V_{\text{l}}^{*} \) :
-
Complex propagation velocity of damped longitudinal wave in soil
- \( V_{{s}}^{*} \) :
-
Complex propagation velocity of damped shear wave in soil
- \( \nu \) :
-
Poisson’s ratio of soil
- β :
-
Hysteretic damping of soil
- λ *, G * :
-
Complex Lame’s constants of soil
- ρ :
-
Mass density of soil
- ρ p :
-
Mass density of pile
- \( \eta \), \( u_{1\hom }^{r} \), \( q_{{}}^{2} \), \( u_{1par}^{r} \), b n , T n :
-
Temporary variables
- ω :
-
Circular frequency
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 51708064, 51878173 and 41977259) and the Scientific Research Starting Foundation of Fujian University of Technology (GY-Z19097).
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Zheng, C., Kouretzis, G., Luan, L. et al. Kinematic response of pipe piles subjected to vertically propagating seismic P-waves. Acta Geotech. 16, 895–909 (2021). https://doi.org/10.1007/s11440-020-01050-3
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DOI: https://doi.org/10.1007/s11440-020-01050-3