Simplified BNWF model for nonlinear seismic response analysis of offshore piles with nonlinear input ground motion analysis

Naggar, M. Hesham El; Shayanfar, Mohsen Ali; Kimiaei, Mehrdad; Aghakouchak, Ali Akbar

doi:10.1139/t04-103

Cited by 49 publications

(21 citation statements)

References 16 publications

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“…These models were used to evaluate the response of different structures subjected to extreme loading conditions due to earthquakes, wind, current and wave loading or ground movement (e.g. El Naggar and Novak, 1996b; Mostafa and El Naggar, 2004 and2006;El Naggar, et al, 2005). All the above BNWF models assume that the pile behaves in a linear elastic manner, or utilizes equivalent linear analysis to account for the nonlinearity of the pile material.…”

Section: Piles Response To Cyclic Loadingmentioning

confidence: 99%

Geo-Structural Nonlinear Analysis of Piles for Performance Based Design

Naggar¹,

Heidari²

2018

World Congress on Civil, Structural, and Environmental Engineering

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Pile foundations supporting bridge structures are often subjected to static and/or dynamic lateral loads due to different hazards such as vessel impacts, traffic, waves, wind, and earthquakes. Two major factors that affect the pile lateral behavior under extreme lateral loading are the interaction between the pile and surrounding soil and the material inelasticity of the pile itself. This presentation covers the state-of-the-art of modeling the nonlinear response of piles. In addition, it describes the recent development of an efficient and robust approach for the analysis of piles based on the Beam on Nonlinear Winkler (BNWF). In this work, a general cyclic BNWF model is developed to account for the important features of soil-pile interaction problem including lateral load characteristics, soil cave-in, soil-pile side shear, gap formation, and strength and stiffness hardening/degradation. The inelastic behavior of pile material is also modeled effectively by implementing the advanced fiber technique. The capability of the developed model in predicting the response of pile under lateral static and cyclic loading is validated by comparing the computed results with experimental data.

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Section: Piles Response To Cyclic Loadingmentioning

confidence: 99%

Geo-Structural Nonlinear Analysis of Piles for Performance Based Design

Naggar¹,

Heidari²

2018

World Congress on Civil, Structural, and Environmental Engineering

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“…Available methods are both analytical and numerical methods. In the realm of numerical methods, the kinematic response of piles has been studied mainly by boundary element methods [8,9] and finite element programs [4,[10][11][12][13][14][15][16][17]. The existing analytical solutions are mostly based on a Beam-on-Dynamic-Winkler-Foundation (BDWF) model, while a few rigorous closed-form solutions are available.…”

Section: Introductionmentioning

confidence: 99%

Transverse seismic kinematics of single piles by a modified Vlasov model

Liu

Deng

2014

Num Anal Meth Geomechanics

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SUMMARYWithin the framework of soil–pile interaction, a novel displacement scheme for the transverse kinematic response of single piles to vertically propagating S waves is proposed on the basis of the modified Vlasov foundation model. The displacement model contains a displacement function along the pile axis and an attenuation function along the radial direction. The governing equations and boundary conditions of the two undetermined functions are obtained in a coupled form by using Hamilton's principle. An iterative algorithm is adopted to decouple and solve the two unknown functions. In light of the governing equation of the pile kinematics, a mechanical model is proposed to evaluate the present method on a physical basis considering material damping. The coefficient of the equivalent Winkler spring is derived explicitly as function of the displacement decay parameter γ and soil Poisson's ratio. A parametric study is performed to investigate the effects of the soil–pile system properties on the kinematic response of single piles. The results show that the dimensionless pile length controls the transverse kinematics of piles. In terms of the theory of beams on elastic foundation, the classification limits of the dimensionless pile length may be π ∕ 4 and π, respectively. Copyright © 2014 John Wiley & Sons, Ltd.

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“…In addition, soil-pile coupling behavior is important when the load transfer occurs [ 1 ]. Evaluation of the pile group behavior and the soil-pile interaction has developed by several investigators in experimental and analytical modeling [ 2 – 4 ]. Existing methods of the analytical modeling can be classified into numerical approaches, Beam on Nonlinear Winkler Foundation method (BNWF), and simplified formulations [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Pile Spacing Effects under Lateral Loading in Sand

Khari

Kassim

Adnan

2013

The Scientific World Journal

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Grouped and single pile behavior differs owing to the impacts of the pile-to-pile interaction. Ultimate lateral resistance and lateral subgrade modulus within a pile group are known as the key parameters in the soil-pile interaction phenomenon. In this study, a series of experimental investigation was carried out on single and group pile subjected to monotonic lateral loadings. Experimental investigations were conducted on twelve model pile groups of configurations 1 × 2, 1 × 3, 2 × 2, 3 × 3, and 3 × 2 for embedded length-to-diameter ratio l/d = 32 into loose and dense sand, spacing from 3 to 6 pile diameter, in parallel and series arrangement. The tests were performed in dry sand from Johor Bahru, Malaysia. To reconstruct the sand samples, the new designed apparatus, Mobile Pluviator, was adopted. The ultimate lateral load is increased 53% in increasing of s/d from 3 to 6 owing to effects of sand relative density. An increasing of the number of piles in-group decreases the group efficiency owing to the increasing of overlapped stress zones and active wedges. A ratio of s/d more than 6d is large enough to eliminate the pile-to-pile interaction and the group effects. It may be more in the loose sand.

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Simplified BNWF model for nonlinear seismic response analysis of offshore piles with nonlinear input ground motion analysis

Cited by 49 publications

References 16 publications

Geo-Structural Nonlinear Analysis of Piles for Performance Based Design

Geo-Structural Nonlinear Analysis of Piles for Performance Based Design

Transverse seismic kinematics of single piles by a modified Vlasov model

An Experimental Study on Pile Spacing Effects under Lateral Loading in Sand

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