Experimental p-y loops for estimating seismic soil-pile interaction

Seismic soil-pile interaction is evaluated in this study based on back-calculated p-y loops constructed from sampled data of pile bending moments. Fundamental properties of p-y loops are implemented to derive distributed springs and dashpots, thereby quantifying soil-pile interaction in the realm of a Beam on Dynamic Winkler Foundation modeling. The procedure is validated by means of well-documented centrifuge tests of a single pile supported structure founded on a two-layer soil profile that comprises of soft clay overlying dense sand. Two shaking levels of a real earthquake motion applied at the base of the soil profile were examined and the generated seismic p-y loops were compared to cyclic p-y curves commonly used in pile design practice. The results demonstrate the strong influence of intensity of the input motion on seismic p-y loops while cyclic p-y curves established for soft clays tend to overestimate soil stiffness under strong excitation. Typical sets of recorded and computed structural response are presented, denoting the ability of the BDWF model related to p-y loops in reproducing adequately fundamental aspects of seismic soil-pile interaction.

[1]  H. Matlock.  Correlation for Design of Laterally Loaded Piles in Soft Clay , 1970 .

[2]  Joseph Ray Meyer.  Analysis and Design of Pile Foundations , 1984 .

[3]  Milos Novak,et al.  Nonlinear lateral interaction in pile dynamics , 1995 .

[4]  Jose M. Roesset.  Stiffness and Damping Coefficients of Foundations , 1991 .

[5]  L. Reese,et al.  Analysis of Laterally Loaded Piles in Sand , 1974 .

[6]  Michael C. Georgiadis,et al.  Centrifugal testing of laterally loaded piles in sand , 1992 .

[7]  Daniel W. Wilson,et al.  Seismic Soil-Pile-Structure Interaction Experiments and Analyses , 1999 .

[8]  Milos Novak,et al.  Stiffness Constants of Single Piles , 1983 .

[9]  N. Abrahamson,et al.  Simplified Frequency Content Estimates of Earthquake Ground Motions , 1998 .

[10]  Lymon C. Reese,et al.  Analysis of Laterally Loaded Piles in Weak Rock , 1997 .

[11]  Gjw King,et al.  THE DEVELOPMENT OF A MEDIUM-SIZE CENTRIFUGAL TESTING FACILITY , 1985 .

[12]  George Gazetas,et al.  Kinematic seismic response and bending of free-head piles in layered soil , 1993 .

[13]  B. R. Grubbs,et al.  Field Testing of Laterally Loaded Piles In Sand , 1974 .

[14]  Michael W. O'Neill,et al.  Evaluation of p-y relationships in cohesionless soils , 1984 .

[15]  Milos Novak,et al.  Nonlinear analysis for dynamic lateral pile response , 1996 .

[16]  Toyoaki Nogami,et al.  Dynamic Soil Reactions for Plane Strain Case , 1978 .

[17]  M. P. Romo,et al.  P–Y Curves for Piles Under Seismic Lateral Loads , 1998 .

[18]  Nikos Gerolymos,et al.  PHENOMENOLOGICAL MODEL APPLIED TO INELASTIC RESPONSE OF SOIL-PILE INTERACTION SYSTEMS , 2005 .

[19]  Nicos Makris,et al.  Nonlinear response of single piles under lateral inertial and seismic loads , 1996 .

[20]  Milos Novak,et al.  Dynamic Stiffness and Damping of Piles , 1974 .

[21]  Ronald F. Scott,et al.  Analysis of Centrifuge Pile Tests; Simulation of Pile-Driving , 1980 .

[22]  Jaan Kiusalaas,et al.  Numerical Methods in Engineering with MATLAB®: Index , 2005 .

[24]  Jose M. Roesset,et al.  NONLINEAR LATERAL DYNAMIC STIFFNESS OF PILES , 1981 .

[25]  Ricardo Dobry,et al.  Horizontal Response of Piles in Layered Soils , 1984 .

[26]  M. KAVVADAS.  Kinematic seismic response and bending of free-head piles in layered soil , 2000 .

[27]  John M. Ting,et al.  Centrifuge static and dynamic lateral pile behaviour , 1987 .

[28]  George Gazetas,et al.  Soil-pile-bridge seismic interaction : Kinematic and inertial effects. Part I: Soft soil , 1997 .

[29]  Gary Norris,et al.  MODELING LATERAL SOIL-PILE RESPONSE BASED ON SOIL-PILE INTERACTION , 2000 .

[30]  Sandra Escoffier,et al.  Numerical modeling of centrifuge cyclic lateral pile load experiments , 2009 .

[31]  John M. Ting,et al.  Full-scale cyclic dynamic lateral pile responses , 1987 .

[32]  Nicos Makris,et al.  Prediction of Observed Bridge Response with Soil-Pile–Structure Interaction , 1994 .

[33]  Kazuo Konagai,et al.  Nonlinear soil-pile interaction model for dynamic lateral motion , 1992 .

[34]  L. M. Kraft,et al.  SEISMIC P = Y RESPONSES OF FLEXIBLE PILES , 1980 .

[35]  R Dobry,et al.  HORIZONTAL STIFFNESS AND DAMPING OF SINGLE PILES , 1982 .

[36]  D. J. Wilson,et al.  SOIL-PILE-SUPERSTRUCTURE INTERACTION IN LIQUEFYING SAND AND SOFT CLAY , 1998 .