Equivalent-linear pile head impedance functions using a hybrid method

Torabi, Hooman; Rayhani, Mohammad T.

doi:10.1016/j.soildyn.2017.07.014

Cited by 5 publications

(5 citation statements)

References 20 publications

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“…A finite element model (Figure 5) is developed to simulate ice-jacket interaction with structural and material parameters listed in Tables 4 and 5. To simplify the simulation of pile-soil-structure interactions, we have adopted the equivalent pile method to model the constraint of pile legs [40]. The equivalent pile method involves making a section of a beam based on the pile-soil properties so that the beam end stiffness is equivalent to the pile top stiffness.…”

Section: Numerical Modelmentioning

confidence: 99%

Ice-Induced Vibration Analysis of Offshore Platform Structures Based on Cohesive Element Method

Zhang,

Wang,

Sun

et al. 2023

JMSE

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This study conducted ice-induced vibration analysis on offshore platform structures using the cohesive element method (CEM). The efficacy of this method in simulating the interaction between sea ice and the platform structure is verified by comparing it with the Hamburg Ship Modeling Pool (HSVA) ice-breaking experiment. Subsequently, the vibration response of a sea-ice-jacket platform model is investigated under both unprotected conditions and with the presence of ice-breaking cones. The findings reveal that the motion response of offshore platforms exhibits a positive correlation with the impact velocity of the ice, while the sensitivity of this impact is found to be minimal. Furthermore, the influence of different ice directions on the vibration response of offshore platforms is significant, and the shielding effect has an important impact on the platform’s response. Notably, offshore platforms equipped with 52.5-degree cones demonstrate the most effective vibration reduction, reducing the maximum acceleration by 63% compared to unprotected configurations. It is worth mentioning that as the cone angle increases, the corresponding ice-breaking cone undergoes higher load-bearing.

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Section: Numerical Modelmentioning

confidence: 99%

Ice-Induced Vibration Analysis of Offshore Platform Structures Based on Cohesive Element Method

Zhang,

Wang,

Sun

et al. 2023

JMSE

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“…Chen et al conducted a numerical simulation of pile foundation in karst areas and studied the effect of amount, size, and interval of karst caves on bearing characteristics of pile foundation, pointing out that the number of karst caves is positively correlated with the negative friction of pile foundation [7]. In recent years, researchers have carried out the corresponding studies to improve the calculation model and the determination method of parameters according to the theoretical analysis method of the dynamic response of pile foundation and carry out the dynamic analysis of bridge structure based on multipile foundation model [8][9][10][11]. Tang et al [12] conducted vibration table tests with laminar shear box to study the dynamic response of reinforced concrete piles behind wharf bank wall under the effect of liquefied lateral soil flow and presented the significance of large-scale test for the further study of response evaluation of pile foundation under the condition of liquefied site.…”

Section: Introductionmentioning

confidence: 99%

Influence of Karst Caves at Pile Side on the Bearing Capacity of Super-Long Pile Foundation

Wang

Ding

Zhang

2020

Mathematical Problems in Engineering

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The differences in development and situation of karst caves lead to two kinds of karst caves, and the karst cave may be on the pile side or at the pile bottom, which has a different influence on the bearing capacity of pile foundation. The paper presents a numerical analysis of the influence of karst caves at pile side on the bearing capacity of super-long pile foundation in karst areas. According to the size of pile foundation of a real bridge project, this paper modelized karst caves and investigated the karst cave from the effect of length, height, and thickness of roof on horizontal and vertical bearing capacity of pile foundation. The main conclusions can be drawn as: when the horizontal displacement at the top of pile foundation is greater than 0.05 m, the horizontal load is correlated positively with the length of karst cave; when the vertical displacement is greater than 0.07 m, the vertical load is correlated negatively with the thickness of the roof of karst cave. However, the height of karst cave has little effect on the bearing capacity; also the existence of karst cave has little influence on the dynamic response of pile foundation. The results of this study can be important with reference to the design and construction of pile foundations in karst areas.

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“…It is noted that the results of Prony series method could be same as that of the simplest fractional derivative representations [33]. [34] presents a hybrid numerical-analytical methodology for pile head impedance functions under inelastic soil-pile interaction. Results from three-dimensional nonlinear finite element analyses of single piles under dynamic pile head loading are used as input to the derivation algorithm.…”

Section: Introductionmentioning

confidence: 99%

Identification of Viscoelastic Property of Pile-Soil Interactions with Fractional Derivative Model

Zatar

Xiao

Chen

et al. 2020

Journal of Low Frequency Noise, Vibration and Active Control

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The viscoelastic property of pile-soil interactions is modeled by fractional derivative method and is used to characterize the structural dynamics of pile and rheological behavior of a thawing frozen soil. A study of the thawing frozen soil impacts on pile structure’s dynamic characteristic is carried out. The frequency spectrum analysis and empirical modal decomposition are used to identify the pile structure dynamic properties. The rocking mode vibration in which pile behaviors like rigid body supported by viscoelastic soil is extracted to capture the viscoelastic property of pile-soil interactions. The rocking mode exhibiting time-varying frequency features is modeled with fractional derivative model and the fractional derivative order is identified. This study proposes a quick and reliable method to identify the viscoelastic property of pile-soil interactions.

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Equivalent-linear pile head impedance functions using a hybrid method

Cited by 5 publications

References 20 publications

Ice-Induced Vibration Analysis of Offshore Platform Structures Based on Cohesive Element Method

Ice-Induced Vibration Analysis of Offshore Platform Structures Based on Cohesive Element Method

Influence of Karst Caves at Pile Side on the Bearing Capacity of Super-Long Pile Foundation

Identification of Viscoelastic Property of Pile-Soil Interactions with Fractional Derivative Model

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