Effect of Pile Foundation on Natural Frequency of Soil Layer

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Shirgir V.; GHANBARI A.; Mohammad Amiri A.; Derakhshandi A.

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Journal: JOURNAL OF ENGINEERING GEOLOGY Year:2017 | Volume:10 | Issue:4 Page(s): 3839-3856

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Title

Effect of Pile Foundation on Natural Frequency of Soil Layer

Author(s)

Shirgir V. | GHANBARI A. | Mohammad Amiri A. | Derakhshandi A. | Issue Writer Certificate

Keywords

free vibration periodQ1

piles in alluviumQ1

end-bearing and friction pilesQ1

numerical methodQ1

Abstract

Free vibration of soil often occurs during earthquakes. Since the vibration caused by earthquake does not have (steady state harmonic vibration) continuity, the alluvium vibrates with its natural frequency between two natural seismic waves. This study evaluates the effect of piles on the period of free vibration of a soil layer using numerical method. In the first stage, using analytical equations for calculation of vibration period of a soil layer and a column with continuous mass, the results were analyzed by the software. In the second step, piles with the same dimensions and distance were added step by step, and the vibration period for the soil layer with piles was calculated. The friction or floating effects of the piles on alluvial soil vibration period was also examined. The results show that as the number of piles increases, the differences between the results of one dimensional analysis of alluvium soil and the results of the software become different, and this creates the need for specific arrangements for seismic analysis of this kind of alluvium (with inserted piles). The results also suggest that end-bearing piles have a greater effect on alluvial soil vibration period, and with increased amount of the floating of these piles, these effects decline.

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APA: Copy

Shirgir, V., GHANBARI, A., Mohammad Amiri, A., & Derakhshandi, A.. (2017). Effect of Pile Foundation on Natural Frequency of Soil Layer. JOURNAL OF ENGINEERING GEOLOGY, 10(4 ), 3839-3856. SID. https://sid.ir/paper/186318/en

Vancouver: Copy

Shirgir V., GHANBARI A., Mohammad Amiri A., Derakhshandi A.. Effect of Pile Foundation on Natural Frequency of Soil Layer. JOURNAL OF ENGINEERING GEOLOGY[Internet]. 2017;10(4 ):3839-3856. Available from: https://sid.ir/paper/186318/en

IEEE: Copy

V. Shirgir, A. GHANBARI, A. Mohammad Amiri, and A. Derakhshandi, “Effect of Pile Foundation on Natural Frequency of Soil Layer,” JOURNAL OF ENGINEERING GEOLOGY, vol. 10, no. 4 , pp. 3839–3856, 2017, [Online]. Available: https://sid.ir/paper/186318/en

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