Fundamental period and mode shape of layered soil profiles

Hadjian, A.H.

doi:10.1016/s0267-7261(02)00111-2

Cited by 36 publications

(28 citation statements)

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“…pulse testing and random white noise testing) were successful in measuring the fundamental periods of the individual layers. The measured fundamental periods of the decoupled granular layers were employed in the calculation of the equivalent fundamental period of the bi-layered deposits by an enhanced Madera procedure ( [1]). …”

Section: Discussionmentioning

confidence: 99%

“…The calculation employed an approximate analytical solution proposed by Hadjian [1] as an enhancement to the Madera procedure [33]. The Madera procedure consists of replacing the first two layers of an N-layer soil profile by an equivalent 'single' layer.…”

Section: Evaluation Of Fundamental Periods For the Depositsmentioning

confidence: 99%

“…The approximate analytical solution proposed by Hadjian [1] increases the calculation accuracy and can also cater for a variation of density across the soil profile (Eq. 4-6) …”

Section: Fig7mentioning

confidence: 99%

“…Pulse tests and random white noise tests were carried out to measure the natural frequency of the individual layers. The fundamental periods of the stratified deposits were evaluated and compared to an analytical solution from the literature ( [1]). The influences brought by the particulate material characteristics and the dynamic input parameters on the free field response were analysed.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic testing of free field response in stratified granular deposits

Dihoru¹,

Bhattacharya

Moccia

et al. 2016

Soil Dynamics and Earthquake Engineering

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Section: Discussionmentioning

confidence: 99%

Section: Evaluation Of Fundamental Periods For the Depositsmentioning

confidence: 99%

“…The approximate analytical solution proposed by Hadjian [1] increases the calculation accuracy and can also cater for a variation of density across the soil profile (Eq. 4-6) …”

Section: Fig7mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic testing of free field response in stratified granular deposits

Dihoru¹,

Bhattacharya

Moccia

et al. 2016

Soil Dynamics and Earthquake Engineering

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“…They showed that during great earthquakes, the alluvial soil experiences its natural vibration many times through frequency [8]. Hadjian (2002) proposed an equation to calculate the free vibration frequency and vibration mode of multi-layer soil [9]. Christos Vrettos (2013) analytically examined the effects of hardness of different layers of alluvial soil on free vibration frequency, considering the nonlinear influences of alluvial materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pile Foundation on Natural Frequency of Soil Layer

Shirgir¹,

Amiri²,

Ghanbari³

et al. 2017

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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 * Corresponding author v.shirgir@gmail.com 3840Journal of Engineering Geology, Vol. 10, No. 4, Winter 2017 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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