Effect of nonlinear soil-structure interaction on seismic response of low-rise SMRF buildings

The nonlinear behavior of a soil-foundation system may alter the seismic response of a structure by providing additional fl exibility to the system and dissipating hysteretic energy at the soil-foundation interface. However, the current design practice is still reluctant to consider the nonlinearity of the soil-foundation system, primarily due to lack of reliable modeling techniques. This study is motivated towards evaluating the effect of nonlinear soil-structure interaction (SSI) on the seismic responses of low-rise steel moment resisting frame (SMRF) structures. In order to achieve this, a Winklerbased approach is adopted, where the soil beneath the foundation is assumed to be a system of closely-spaced, independent, nonlinear spring elements. Static pushover analysis and nonlinear dynamic analyses are performed on a 3-story SMRF building and the performance of the structure is evaluated through a variety of force and displacement demand parameters. It is observed that incorporation of nonlinear SSI leads to an increase in story displacement demand and a significant reduction in base moment, base shear and inter-story drift demands, indicating the importance of its consideration towards achieving an economic, yet safe seismic design.

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

[2]  M. Hesham El Naggar,et al.  An investigation into the Winkler modeling of the cyclic response of rigid footings , 2008 .

[3]  Tara C. Hutchinson,et al.  Beam-on-Nonlinear-Winkler-Foundation Modeling of Shallow, Rocking-Dominated Footings , 2009 .

[4]  Jonathan P. Stewart,et al.  Numerical Models for the Analysis and Performance-Based Design of Shallow Foundations Subjected to Seismic Loading , 2008 .

[5]  K. Terzaghi.  Theoretical Soil Mechanics , 1943 .

[6]  Prishati Raychowdhury,et al.  Performance evaluation of a nonlinear Winkler‐based shallow foundation model using centrifuge test results , 2009 .

[7]  Akshay Gupta,et al.  Behavior of Ductile SMRFs at Various Seismic Hazard Levels , 2000 .

[8]  Prishati Raychowdhury,et al.  Performance of seismically loaded shearwalls on nonlinear shallow foundations , 2011 .

[9]  G. Gazetas.  FORMULAS AND CHARTS FOR IMPEDANCES OF SURFACE AND EMBEDDED FOUNDATIONS , 1991 .

[10]  Johnny Sun,et al.  Development of Ground Motion Time Histories for Phase 2 of the FEMA/SAC Steel Project , 1997 .

[11]  Jonathan P. Stewart,et al.  Revisions to Soil-Structure Interaction Procedures in NEHRP Design Provisions , 2003 .

[12]  Anil K. Chopra,et al.  Simplified Earthquake Analysis of Structures with Foundation Uplift , 1985 .

[13]  Roberto Paolucci,et al.  A macro‐element model for non‐linear soil–shallow foundation–structure interaction under seismic loads: theoretical development and experimental validation on large scale tests , 2012 .

[14]  George Geoffrey Meyerhof,et al.  Some recent research on the bearing capacity of foundations , 1963 .

[15]  Prishati Raychowdhury,et al.  Nonlinear Winkler-based shallow foundation model for performance assessment of seismically loaded structures , 2008 .

[17]  William T. Holmes,et al.  The 1997 NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures , 2000 .

[18]  Xiong Jianguo,et al.  A modified lumped parametric model for nonlinear soil-structure interaction analysis , 1993 .

[19]  George Gazetas,et al.  Soil-Structure Interaction Effects on Elastic and Inelastic Structures , 2001 .

[20]  S. C. Dutta,et al.  Response of low-rise buildings under seismic ground excitation incorporating soil-structure interaction , 2004 .

[21]  Prishati Raychowdhury,et al.  Sensitivity of Shallow Foundation Response to Model Input Parameters , 2010 .

[22]  Jonathan P. Stewart,et al.  Application and Validation of Practical Tools for Nonlinear Soil-Foundation Interaction Analysis , 2010 .

[23]  Anil K. Chopra,et al.  Simplified Earthquake Analysis of Multistory Structures With Foundation Uplift , 1985 .