Natural Frequency of Single Pier Bridges Considering Soil-Structure Interaction

Shirgir, Vahid; Ghanbari, Ali; Shahrouzi, Mohsen

doi:10.1080/13632469.2015.1104754

Cited by 19 publications

(6 citation statements)

References 11 publications

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“…Many previous works have focused on scour effects on piled bridges, where the scour-related stiffness reduction mechanism affects the lateral stiffness and capacity of piled foundations (Bao et al, 2019;Bao & Liu, 2020;Elsaid & Seracino, 2014;Foti & Sabia, 2011;Klinga & Alipour, 2015;Prendergast et al, , 2017Shirgir et al, 2016). In the present work, the focus is on bridges with shallow foundations, where the vertical stiffness is affected by scour undermining the foundation, a mechanism that has received much less attention in previous literature.…”

Section: Effect Of Scour On Bridge Modal Propertiesmentioning

confidence: 93%

Wavelet-based operating deflection shapes for locating scour-related stiffness losses in multi-span bridges

O’Brien

McCrum

Khan

et al. 2021

Structure and Infrastructure Engineering

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Section: Effect Of Scour On Bridge Modal Propertiesmentioning

confidence: 93%

Wavelet-based operating deflection shapes for locating scour-related stiffness losses in multi-span bridges

O’Brien

McCrum

Khan

et al. 2021

Structure and Infrastructure Engineering

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“…By increasing the number of piles in a pile group, the period quotient of the system decreases. In other words, an increase in the number of the piles in a pile group increases the stiffness of the system whereas its period decreases [11]. Findings suggest that elements (like piles) that cause changes in the material and soil texture change the vibration characteristics of alluvial soil.…”

Section: Introductionmentioning

confidence: 89%

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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“…The n is the number of piles in a row of piles in a square pile group, is density, I is first moment of inertia around the pile (circular), E is modulus of elasticity of the pile and G denotes shear modulus of the soil [19].…”

Section: Proposed Analytical Model For Structure-soil-end-bearing Pilmentioning

confidence: 99%

“…Later, Chang et al analyzed a single dimensional wave equation for piles under the shaking horizontal seismic ground [5]. Other studies on the seismic response of buildings with shallow and pile foundations were conducted by Hokmabadi et al, Ghanbari and Shirgir et al [6][7][8]. Fattah et al [9] studied the excess pore water pressure generated around a single pile and pile group experimentally.…”

Section: Introductionmentioning

confidence: 99%

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An Analytical Model for Estimating the Vibration Frequency of Structures Located on the Pile Group in the Case of Floating Piles and End-bearing Pile

2018

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Exact estimation of vibration fundamental period of structures plays a vital role in their designing procedure. The proposition of a relatively exact expression which considers the effects of a pile group on the fundamental period of the structures was of less interest to previous researchers. This study aims to propose an analytical model and expression so as to estimate the free vibration period of the structures located on a pile group. To reach the objectives of this study, several numerical analyses has been carried out using the method of equivalent spring which takes into account the effects of soil-pile-structure interaction on the fundamental period of the structures. In the next step of the study the effects of a pile group on the fundamental period of the structures have been analyzed analytically. In this analytical study two cases have been considered for the piles which are end-bearing and floating piles. In the case of floating piles a five degrees-of-freedom analytical model and its corresponding expression have been proposed considering the soil-pile-structure system. The numerical modelling has been performed using the direct method due to the neglect of the soil in analytical expression and the results have been compared with those of the proposed analytical expression. The soil mass participation coefficient (λ) has been obtained using the discrepancy between the results of the two different methods to modify the analytical expression. In the case of end-bearing piles an analytical model with three degrees-of-freedom and its corresponding expressions has been proposed. Then the soil has been neglected and a new analytical expression has been proposed using the mass participation coefficients adopted from other researches to calculate the fundamental period of the structures. The comparison between the results of the proposed expression and those of case and numerical studies confirms that the proposed expressions benefit from a relative accuracy and can be used as an initial criterion in designing procedure.

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Natural Frequency of Single Pier Bridges Considering Soil-Structure Interaction

Cited by 19 publications

References 11 publications

Wavelet-based operating deflection shapes for locating scour-related stiffness losses in multi-span bridges

Wavelet-based operating deflection shapes for locating scour-related stiffness losses in multi-span bridges

Effect of Pile Foundation on Natural Frequency of Soil Layer

An Analytical Model for Estimating the Vibration Frequency of Structures Located on the Pile Group in the Case of Floating Piles and End-bearing Pile

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