Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Parametric study of soil-structure interaction effects on building resonance during earthquake

Document Type : Original Article

Authors
Fazel Nejabati 1
Nemat Hassani 2
Hamid Mohammadnezhad 3
1 Ph. D candidate, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran
2 Associate Professor, Faculty of Civil Water and Environmental engineering, Shahid Beheshti University, Tehran, Iran
3 Assistant Professor, Faculty of Civil Water and Environmental engineering, Shahid Beheshti University, Tehran, Iran
10.22065/jsce.2024.469383.3475
Abstract
Observations and much historical evidence indicate that the phenomenon of resonance during an earthquake increases the seismic forces applied to structures, often leading to their failure. Resonance occurs when the natural period of a system is very close to the period of the applied excitation. In addition, soil-structure interaction causes changes in the period and damping of the structure, which in turn changes the resonant period of the system. However, due to the conservative perception, the effect of soil flexibility is often not considered in the analysis and design process of structures. By identifying the resonant frequency range at a site for different structures under probable earthquakes and incorporating this into the design process, safer structures can be designed and implemented. In this study, the seismic response and the resonance period are calculated for 9 types of structures (four, eight, and twelve stories; with low, medium, and high damping), taking into account the effect of soil-structure interaction under artificial earthquakes (Richter wavelets). The peak relative displacements resulting from 51,408 time history analyses were examined. The mechanical model used in this study has three degrees of freedom, representing the displacement of the roof story, the displacement of the foundation, and the rotation of the foundation around the axis perpendicular to the plane. The foundation is assumed to be circular, and equivalent Winkler springs are used to model the soil. The results show that high damping effects and soil-structure interaction can increase the resonant period by up to 2.5 times. In addition, a table is provided to estimate the average range of earthquake periods leading to resonance, specifically for three types of structures (four, eight, and twelve stories) with damping ratios of 5%, 20% and 35%; and four types of soil (according to the 4th edition of the Iranian seismic code).
Keywords
Resonance
Soil-Structure interaction
Mechanical model
Period
Ricker wavelet
Seismic response

Subjects

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  • Receive Date 28 July 2024
  • Revise Date 09 November 2024
  • Accept Date 23 November 2024