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Milos Novak

Bio: Milos Novak is an academic researcher from University of Western Ontario. The author has contributed to research in topics: Pile & Stiffness. The author has an hindex of 34, co-authored 77 publications receiving 4154 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the stiffness and damping of footings and structures supported by piles can be predicted if dynamic stiffness is generated by the soil-pile interaction, and an approximate analytical approach is presented.
Abstract: Dynamic response of footings and structures supported by piles can be predicted if dynamic stiffness and damping generated by soil–pile interaction can be defined. An approximate analytical approac...

598 citations

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TL;DR: In this article, the authors investigated the resistance of soil to harmonic motion of an infinitely long cylinder in terms of linear viscoelasticity and obtained a closed-form solution from which the complex stiffness can be evaluated.
Abstract: Resistance of soil to harmonic motion of an infinitely long cylinder is investigated theoretically in terms of linear viscoelasticity. Closed-form solution is obtained from which the complex stiffness can be evaluated. The numerical results agree with those obtained by means of the correspondence principle.

400 citations

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TL;DR: In this paper, the interaction between a soil layer and an end bearing pile is theoretically investigated, where the pile is assumed to be vertical and elastic, the soil is considered as a linear visco-elastic layer with hysteretic type damping.
Abstract: The interaction between a soil layer and an end bearing pile is theoretically investigated. The pile is assumed to be vertical and elastic, the soil is considered as a linear visco-elastic layer with hysteretic type damping. The layer alone is solved first and the wave modes of the layer are used in the analysis of the pile response. The pile response to a harmonic load is obtained in a closed form and used to define stiffness and damping at the level of the pile head. The dimensionless parameters of the problem are identified. A parametric study is conducted to determine the main features of the response and of the equivalent stiffness and damping. The validity of equivalent viscous damping is examined. A comparison is made with the simpler plane strain theory used previously and its accuracy is assessed.

201 citations

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TL;DR: In this paper, the interaction between soil and an elastic pile vibrating horizontally is theoretically examined, where the pile is assumed to be vertical and point bearing and the soil is modelled as a linear, viscoelastic layer overlying rigid bedrock.
Abstract: Interaction between soil and an elastic pile vibrating horizontally is theoretically examined. The soil is modelled as a linear, viscoelastic layer overlying rigid bedrock. The pile is assumed to be vertical and point bearing. This study utilizes the definition of soil resistance presented in a preceding paper.1 A direct solution is developed which yields closed form formulas for pile displacement, stiffness and damping. A parametric study clarifies the role of the parameters involved, illustrates the interaction between the soil and the pile and shows the stiffness and damping properties of the soil-pile system for typical values of the governing parameters.

189 citations

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TL;DR: In this paper, an approximate analytical solution is established that makes it possible to calculate impedance functions (stiffness and damping) of a single pile embedded in layered media, where the pile can be of stepwise variable cross section and feature any tip condition.
Abstract: An approximate analytical solution is established that makes it possible to calculate impedance functions (stiffness and damping) of a single pile embedded in layered media. The pile can be of stepwise variable cross section and feature any tip condition. The impedance functions are complex and frequency dependent but can be obtained by means of a computer program that is simple and very inexpensive to run. A comparison of the theory with experiments indicates the potential of the theory and demonstrates the need to consider the variation of soil properties with depth and lack of the fixity of the tip for short piles.

180 citations


Cited by
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Journal ArticleDOI
B.B. Bauer1
01 Apr 1963

897 citations

Journal ArticleDOI
TL;DR: In this article, experiments on the vortex shedding frequencies of various rectangular cylinders were conducted in a wind tunnel and in a water tank and the results show how Strouhal number varies with a width-to-height ratio of the cylinders in the range of Reynolds number between 70 and 2 × l04.
Abstract: Experiments on the vortex-shedding frequencies of various rectangular cylinders were conducted in a wind tunnel and in a water tank. The results show how Strouhal number varies with a width-to-height ratio of the cylinders in the range of Reynolds number between 70 and 2 × l04. There is found to exist a certain range of Reynolds number for the cylinders with the width-to-height ratios of 2 and 3 where flow pattern abruptly changes with a sudden discontinuity in Strouhal number. The changes in flow pattern corresponding to the discontinuity of Strouhal number have been confirmed by means of measurements of velocity distribution and flow visualization. These data are compared with those of other investigators. The experimental results have been found to show a good agreement with those of numerical calculations.

877 citations

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TL;DR: In this article, the use of nonreflecting boundary conditions in numerical solution of wave problems is reviewed, including local and non-local boundary conditions, as well as special procedures which involve artificial boundaries.

727 citations

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TL;DR: In this paper, a complete set of algebraic formulas and dimensionless charts are presented for readily computing the dynamic stiffnesses and damping coefficients of foundations harmonically oscillating on/in a homogeneous half-space.
Abstract: A complete set of algebraic formulas and dimensionless charts is presented for readily computing the dynamic stiffnesses (\IK\N) and damping coefficients (\IC\N) of foundations harmonically oscillating on/in a homogeneous half-space. All possible modes of vibration, a realistic range of Poisson’s ratios, and a practically sufficient range of oscillation frequencies are considered. The foundations have a rigid basemat of any realistic solid geometric shape. The embedded foundations are prismatic, having a sidewall-soil contact surface of height \Id\N, which may be only a fraction of the embedment depth \ID\N. Two numerical examples illustrate the use of the formulas and charts and elucidate the role of foundation shape and degree of embedment on radiation damping for various modes of vibration. A companion paper (Gazetas and Stokoe 1991) presents supporting experimental evidence from model tests. The two papers aim at encouraging the practicing engineer to make use of results obtained with state-of-the-art formulations, when studying the dynamic response of foundations.

545 citations

Journal ArticleDOI
TL;DR: A review of the state-of-the-art of analyzing the dynamic response of foundations subjected to machine-type loadings can be found in this article, where the authors present simple formulae and dimensionless graphs for both the static and dynamic parts of impedances, pertaining to surface and embedded foundations having circular, strip, rectangular or arbitrary plan shape and supported by three types of idealized soil profiles: the halfspace, the stratum-over-bedrock and the layerover-halfspace.

512 citations