Evaluation of Wavelet Energy for the Vibration of a Single Pile Embedded in Sand under the Effect of Near-Field and Far-Field Earthquakes

Subject Areas : Analysis of Structure and Earthquake

Navid Hasanpouri Notash ¹ ( Ph.D. Candidate, Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran )
روزبه دبیری ² ( عضو هیئت علمی )
Masoud Hajialilue Bonab ³ ( Geotechnical Unit, Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran )
Larissa Khodadadi ⁴ ( Assistant Professor, Department of Electrical Engineering, Tabriz Branch, Islamic Azad university, Tabriz , Iran )
فریبا بهروز سرند ⁵ ( Assistant Professor, Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran )

Received: 2024-04-08 Accepted : 2024-06-07 Published : 2024-06-10

Keywords: Pile, Far-field and near-field earthquakes, Wavelet transform, Abaqus, MATLAB,

Abstract :

Evaluating pile performance against seismic loading is one of the most important issues in geotechnical engineering. Various approaches are used in the evaluation of this performance, which can be referred to as continuous and discrete approaches. In the continuous approach, two-dimensional and three-dimensional analyzes can be used. One of the very important disadvantages that can be pointed out in the three-dimensional analyzes of piles is the increase in computational costs. Therefore, improving the accuracy of two-dimensional analyzes in order to reduce computational costs is inevitable. The present study has used Abaqus finite element software to evaluate the response of a single pile embedded in single— and double-layer sand under two earthquake records (far-field and near-field). The subsequent stage involved employing the wavelet transformation technique to analyze the signal derived from the pile cross-section. The present study utilized the acceleration time histories of the pile head as the input signal for wavelet transformation. The result showed that the wavelet energy for the pile head signal was higher in the near-field record than in the far-field record. The analysis indicated an 11% and 41% increase in wavelet energy for single-layer and double-layer profiles, respectively. This increase in wavelet energy is due to the significant increase in horizontal displacement of the pile under near-field records compared to far-field records. Therefore, by implementing signal processing analysis employing continuous wavelet transformation on the horizontal acceleration of the pile section, relevant information regarding the type of earthquake records that occurred at the site can be extracted.

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