Evaluation of Structure Frequency on the Dynamic Response of Piled Raft Foundations

Document Type : Regular Paper

Authors

1 Master’s Graduted of Geotechnical Engineering, Iran University of Science and Technology (IUST), Narmak, Iran

2 Assistant Professor, School of Engineering, Damghan University, Damghan, Iran

3 Professor, School of Civil Engineering, Iran University of Science and Technology (IUST), Narmak, Iran

4 Associate Professor, School of Civil Engineering, Iran University of Science and Technology (IUST), Narmak, Iran

Abstract

This study examines the impact of structural frequency under various input excitations on the dynamic behavior of a piled raft (PR) foundation embedded in a dry sand layer. Numerical modeling using the finite element method was evaluated by experimental results from centrifuge test. The findings reveal that the structure's natural frequency, affected by the dynamic characteristics of both the soil and the foundation, is significantly lower than that of the fixed-base condition. However, the structure's frequency changes are independent of the excitation dominant frequency. Furthermore, as the structure's natural frequency rises, the disparity between the fixed-base condition and the foundation-inclusive scenario becomes increasingly pronounced. These changes significantly affect the whole dynamic system responses, precisely the maximum bending moment along the piles. It highlights the importance of considering the soil-structure interaction in the design process. Additionally, when the frequency of the input excitation closely aligns with the system's natural frequency, it induces the most significant dynamic responses in the soil, pile, raft, and structure. Consequently, relying solely on fixed-based methods in design can lead to unrealistic and potentially unsafe technical decisions.

Highlights

  • Abaqus 3D is an effective tool for simulating soil-structure interaction.
  • The system's frequency plays a crucial role in the dynamic response of both the foundation and the structure.
  • Modifying the structural frequency at a constant height significantly impacts the pile moments.

Keywords

Main Subjects

References

[1]     Han Y. Seismic response of tall building considering soil-pile-structure interaction. Earthq Eng Eng Vib 2002;1:57–64. https://doi.org/10.1007/s11803-002-0008-y.
[2]     Finn WD., Fujita N. Piles in liquefiable soils: seismic analysis and design issues. Soil Dyn Earthq Eng 2002;22:731–42. https://doi.org/10.1016/S0267-7261(02)00094-5.
[3]     Garala TK, Madabhushi GSP, Di Laora R. Experimental investigation of kinematic pile bending in layered soils using dynamic centrifuge modelling. Géotechnique 2022;72:146–61. https://doi.org/10.1680/jgeot.19.P.185.
[4]     Giannakou A, Gerolymos N, Gazetas G, Tazoh T, Anastasopoulos I. Seismic Behavior of Batter Piles: Elastic Response. J Geotech Geoenvironmental Eng 2010;136:1187–99. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000337.
[5]     Hokmabadi AS, Fatahi B, Samali B. Physical Modeling of Seismic Soil-Pile-Structure Interaction for Buildings on Soft Soils. Int J Geomech 2015;15. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000396.
[6]     Forcellini D. Seismic fragility of tall buildings considering soil structure interaction (SSI) effects. Structures 2022;45:999–1011. https://doi.org/10.1016/j.istruc.2022.09.070.
[7]     SaeediAzizkandi A, Baziar M.H, Razmi B. Experimental Study on Seismic Response of Structure with Piled Raft Foundation. 19th Int. Conf. Soil Mech. Geotech. Eng., 2017, p. 835–8.
[8]     Nakai S, Kato H, Ishida R, Mano H, Nagata M. Load Bearing Mechanism of Piled Raft Foundation during Earthquake. 3third UJNR Work. soil–structure Interact. Menlo Park. California, USA, 2004.
[9]     Chiou J-S, Hung W-Y, Lee Y-T, Young Z-H. Combined dynamic structure-pile-soil interaction analysis considering inertial and kinematic effects. Comput Geotech 2020;125:103671. https://doi.org/10.1016/j.compgeo.2020.103671.
[10]   Tao W, Fu J, Li Y. The Possibility of Detrimental Effects on Soil–Structure Interaction in Seismic Design Due to a Shift in System Frequency. Appl Sci 2024;14:7519. https://doi.org/10.3390/app14177519.
[11]    Zhang X, Far H. Seismic behaviour of high-rise frame-core tube structures considering dynamic soil–structure interaction. Bull Earthq Eng 2022;20:5073–105. https://doi.org/10.1007/s10518-022-01398-9.
[12]   Hussien MN, Karray M, Tobita T, Iai S. Kinematic and inertial forces in pile foundations under seismic loading. Comput Geotech 2015;69:166–81. https://doi.org/10.1016/j.compgeo.2015.05.011.
[13]   Hussien MN, Tobita T, Iai S, Karray M. Soil-pile-structure kinematic and inertial interaction observed in geotechnical centrifuge experiments. Soil Dyn Earthq Eng 2016;89:75–84. https://doi.org/10.1016/j.soildyn.2016.08.002.
[14]   Yamashita K, Hamada J. Kinematic and inertial effects on piled rafts in soft ground supporting isolated and non-isolated buildings observed during the 2011 Tohoku earthquake. Soils Found 2023;63:101372. https://doi.org/10.1016/j.sandf.2023.101372.
[15]   Baziar MH, Rafiee F, Saeedi Azizkandi A, Lee CJ. Effect of super-structure frequency on the seismic behavior of pile-raft foundation using physical modeling. Soil Dyn Earthq Eng 2018;104:196–209. https://doi.org/10.1016/j.soildyn.2017.09.028.
[16]   Schofield AN. Cambridge Geotechnical Centrifuge Operations. Géotechnique 1980;30:227–68. https://doi.org/10.1680/geot.1980.30.3.227.
[17]   Rovithis EN, Pitilakis KD, Mylonakis GE. Seismic analysis of coupled soil-pile-structure systems leading to the definition of a pseudo-natural SSI frequency. Soil Dyn Earthq Eng 2009;29:1005–15. https://doi.org/10.1016/j.soildyn.2008.11.005.
[18]   Lee C-J, Wang C-R, Wei Y-C, Hung W-Y. Evolution of the shear wave velocity during shaking modeled in centrifuge shaking table tests. Bull Earthq Eng 2012;10:401–20. https://doi.org/10.1007/s10518-011-9314-y.
[19]   Reza Tabatabaiefar SH, Fatahi B, Samali B. Seismic Behavior of Building Frames Considering Dynamic Soil-Structure Interaction. Int J Geomech 2013;13:409–20. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000231.
[20]   El Naggar MH, Novak M. Nonlinear analysis for dynamic lateral pile response. Soil Dyn Earthq Eng 1996;15:233–44. https://doi.org/10.1016/0267-7261(95)00049-6.
[21]   Baziar MH, Moghadam MR, Kim D-S, Choo YW. Effect of underground tunnel on the ground surface acceleration. Tunn Undergr Sp Technol 2014;44:10–22. https://doi.org/10.1016/j.tust.2014.07.004.
[22]   Bhowmik D, Baidya DK, Dasgupta SP. A numerical and experimental study of hollow steel pile in layered soil subjected to lateral dynamic loading. Soil Dyn Earthq Eng 2013;53:119–29. https://doi.org/10.1016/j.soildyn.2013.06.011.

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History

  • Receive Date: 31 August 2024
  • Revise Date: 08 December 2024
  • Accept Date: 06 January 2025

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