Dynamic response of offshore jacket structures under random loads

Elshafey, Ahmed A.; Haddara, Moutaz; Marzouk, H.

doi:10.1016/j.marstruc.2009.01.001

Cited by 60 publications

(15 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mostafa and Naggar 10 undertook a parametric study of the soil-structure interaction on the response of a jacket structure subjected to transient loading due to extreme waves and currents. Elshafey et al 11 studied the dynamic response of a scale model of a jacket offshore structure both theoretically and experimentally. Rollins et al 12 performed a series of full-scale cyclic lateral load tests on pile groups with various spacings NOMENCLATURE P d = dynamic soil reaction at depth h, (N/m) P s = static soil reaction obtained from the static p-y curve at depth h, (N/m) a 0 = dimensionless frequency (a 0 = ωy/V s ) ω = frequency of loading, (rad/s) D = pile diameter, (m) U rel = the relative wind velocity Hs = the significant wave height u s = the structure velocity P = the soil reaction at the same depth for a single pile D = the average pile diameter from surface to depth h y = lateral pile deflection at depth h, (m) V s = shear wave velocity of the soil layer, (m/s) α, β, κ and n are constants that depend on the soil type to study the effect of pile spacing on the behavior of the pile group.…”

Section: Introductionmentioning

confidence: 99%

Soil-structure interaction on the response of jacket-type offshore wind turbine

Park

Chung

Shin

et al. 2015

Int. J. of Precis. Eng. and Manuf.-Green Tech.

View full text Add to dashboard Cite

Jacket structures are still at the early stage of their development for use in the offshore wind industry. The aim of this paper is to investigate the effect of the soil-structure interaction on the response of an offshore wind turbine with a jacket-type foundation. For this purpose, two different models of flexible foundation-the p-y model and the p-y model considering pile groups effect-are employed to compare the dynamic responses with the fixed-base model. The modal analysis and the coupled dynamic analysis are carried out under deterministic and stochastic conditions. The influence of the soil-structure interaction on the response of the jacket foundation predicts that the flexible foundation model is necessary to estimate the loads of the offshore wind turbine structure well. It is suggested that during fatigue analysis the pile group effect should be considered for the jacket foundation.

show abstract

Section: Introductionmentioning

confidence: 99%

Soil-structure interaction on the response of jacket-type offshore wind turbine

Park

Chung

Shin

et al. 2015

Int. J. of Precis. Eng. and Manuf.-Green Tech.

View full text Add to dashboard Cite

show abstract

“…et al, 1998). A mark "*" is added to the equation above to denote damaged system with measured values as: (7) It is assumed the individual initial local damage would bring about stiffness matrix loss within little change for mess matrix (Ahmed A. et al, 2009), that is . In order to associate them and eliminate the matrix M, two matrixes and should be premultiplied by these two equations:…”

Section: Modal Strain Methodsmentioning

confidence: 99%

Damage Detection in Offshore Platform Structures under Environmental Loads Using Modal Strain Energy Method

Liu¹,

Jiao²,

Jiang³

2015

International Journal of Engineering Practical Research

View full text Add to dashboard Cite

A damage detection and severity estimation method for jacket offshore platform under environmental loads using modal strain energy method is presented in this paper. This method is different from former localization ones which need complete modal parameters after the damage occurring. It is remarkable because of its ability to diagnose platform health conditions within only a few amounts of identified natural frequencies and limited modal shapes from the damaged structure. First of all, a study of environmental conditions and environmental loads is introduced to expound how the wind, wave and current effect on the structure. After the theoretical derivation of modal strain energy method and the algorithm analysis, a Bohai Bay offshore platform model is demonstrated in the numerical examples, and the final results indicate that an excellent updating is achievable by applying the new method.

show abstract

“…(4) and (5) (Elshafey et al, 2009). Thus the damping ratio ξ could be estimated by fitting the raw data curve to the equations.…”

Section: Free Decay and Damping Ratiomentioning

confidence: 99%

“…They conducted numerical simulations and compared the numerical results with experimental results, and simulations and experimental results were in good agreement. Elshafey et al (2009) designed a scale model theoretically and exp erimentally to investigate the dynamic response of an offshore jacket platform under random wave loads. The experiments were conducted both in air and in towing tank.…”

Section: Introductionmentioning

confidence: 99%