Model verification and assessment of shear-flexure interaction in pile foundations

Fiber models have been developed and applied to various structural elements such as shear walls, beams and columns. Only scarcely have fiber models been applied to circular foundation systems such as cast in drilled holes shafts (CIDH). In pile foundations with constraint head boundary conditions, shear deformations can easily contribute to the lateral pile response. However, soil structure interaction formulations such as the p-y method, commonly used for lateral pile design, do not include structural shear deformations in its traditional derivation method. A fiber model that couples shear and axial-bending behavior, originally developed for wall elements was modified and validated on circular cross sections (columns) before being applied to a 0.61 m diameter reinforced concrete (RC) pile with fixed head boundary conditions. The analytical response was compared to measured test results of a fixed head test pile to investigate the possible impact of pile shear deformations on the displacement, shear, and moment profiles of the pile. Results showed that shear displacements and forces are not negligible and suggest that nonlinear shear deformations for RC piles should be considered for fixed-head or similar conditions. Appropriate sensor layout is recommended to capture shear deformation when deriving p-y curves from field measurements.

[1]  Paola Ceresa,et al.  A fibre flexure–shear model for seismic analysis of RC‐framed structures , 2009 .

[2]  Sandra Escoffier,et al.  Numerical study of the 3D failure envelope of a single pile in sand , 2014 .

[3]  J. Wallace,et al.  Modeling of Squat Structural Walls Controlled by Shear , 2009 .

[4]  Enrico Spacone,et al.  FIBRE BEAM–COLUMN MODEL FOR NON‐LINEAR ANALYSIS OF R/C FRAMES: PART I. FORMULATION , 1996 .

[5]  J. Wallace,et al.  Load-Deformation Responses of Slender Reinforced Concrete Walls , 2004 .

[6]  L. Massone.  Strength prediction of squat structural walls via calibration of a shear–flexure interaction model , 2010 .

[7]  T. Tran,et al.  Experimental and Analytical Studies of Moderate Aspect Ratio Reinforced Concrete Structural Walls , 2012 .

[8]  Kuang-Han Chu,et al.  STRESS-STRAIN RELATIONSHIP FOR PLAIN CONCRETE IN COMPRESSION , 1985 .

[9]  Marco Petrangeli,et al.  Fiber Element for Cyclic Bending and Shear of RC Structures. II: Verification , 1999 .

[10]  J. Wallace,et al.  Modeling of Cyclic Shear-Flexure Interaction in Reinforced Concrete Structural Walls. I: Theory , 2015 .

[11]  Bengt B. Broms,et al.  LATERAL RESISTANCE OF PILE IN COHESIONLESS SOILS , 1964 .

[12]  Michael P. Collins,et al.  Predicting the Response of Reinforced Concrete Beams Subjected to Shear Using the Modified Compression Field Theory , 1988 .

[13]  Jonathan P. Stewart,et al.  Nonlinear Efficiency of Bored Pile Group under Lateral Loading , 2010 .

[14]  B B Broms,et al.  Lateral Resistance of Piles in Cohesive Soils , 1964 .

[15]  John W. Wallace,et al.  A Robust Macroelement Model for Soil–Pile Interaction Under Cyclic Loads , 2006 .

[16]  A. Belarbi,et al.  Constitutive Laws of Concrete in Tension and Reinforcing Bars Stiffened By Concrete , 1994 .

[17]  Marco Petrangeli,et al.  Fiber Element for Cyclic Bending and Shear of RC Structures. I: Theory , 1999 .

[18]  Leonardo M. Massone,et al.  Shear-flexure coupling behavior of steel fiber-reinforced concrete beams , 2012 .

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

[20]  Murat Saatcioglu,et al.  Strength and Ductility of Confined Concrete , 1992 .

[21]  Jonathan P. Stewart,et al.  Nonlinear Load-Deflection Behavior of Reinforced Concrete Drilled Piles in Stiff Clay , 2014 .

[22]  J. Wallace,et al.  Modeling of Cyclic Shear-Flexure Interaction in Reinforced Concrete Structural Walls. II: Experimental Validation , 2015 .

[23]  John W. Wallace,et al.  Displacement-Based Design of Slender Reinforced Concrete Structural Walls—Experimental Verification , 2004 .

[24]  Marco Petrangeli,et al.  A FIBRE FINITE BEAM ELEMENT WITH SECTION SHEAR MODELLING FOR SEISMIC ANALYSIS OF RC STRUCTURES , 1998 .

[25]  Jonathan P. Stewart,et al.  Full Scale Cyclic Large Deflection Testing of Foundation Support Systems for Highway Bridges. Part I: Drilled Shaft Foundations , 2007 .

[26]  B. Taranath.  Seismic Rehabilitation of Existing Buildings , 2004 .

[27]  Luca Martinelli.  Modeling Shear-Flexure Interaction in Reinforced Concrete Elements Subjected to Cyclic Lateral Loading , 2008 .

[28]  J. Mazars,et al.  Using multifiber beams to account for shear and torsion: Applications to concrete structural elements , 2006 .

[29]  Sung-Gul Hong,et al.  Shear–flexural interaction for prestressed self-consolidating concrete beams , 2013 .

[30]  Alex C. Scordelis,et al.  Computer Models for Nonlinear Analysis of Reinforced and Prestressed Concrete Structures , 1984 .

[31]  Lymon C. Reese,et al.  Field Testing and Analysis of Laterally Loaded Piles in Stiff Clay , 2006 .