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Inelastic Nonlinear Pushover Analysis of Fixed Jacket-Type Offshore Platform.with Different Bracing System. Considering Soil-Structure Interaction

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Journal of Shipping and Ocean Engineering 2016年第4期6卷 241-254页

作者： S. Ishwarya m. arockiasamy R. Senthil Division of Structural Engineering Department of Civil Engineering Anna University Chennai India Departm.nt of Civil Environmental and Geomatics Engineering Florida Atlantic University U.S.A.

In this study, inelastic nonlinear pushover analysis is perform.d on a 3-D m.del of a jacket-type offshore platform.for the North Sea conditions. The structure＇ is m.delled, analyzed and designed using finite elem.nt software SACS （structural analysis com.uter system.. The behavior of jackets with different bracing system. under pushover analysis is exam.ned. Further, by varying the leg batter values of the platform. weight optim.zation is carried-out. Soil-structure interaction effect is considered in the analyses and the results are com.ared with the hypothetical fixed-support end condition. Static and dynam.c pushover analyses are perform.d by using wave and seism.c loads respectively. From.the analyses, it is found that the optim.m.leg batter varies between 15 to 16 and 2% of weight saving is achieved. m.reover, it has been observed that the type of bracing does not play a m.jor role in the seism.c design of jacket platform.considering the soil-structure interaction.

关键词： Fixed offshore jacket platform pushover analysis seism.c analysis leg batter optim.zation SACS.

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Sim.lified Design Procedure of m.nopile Foundation for Offshore Wind Turbine in Gujarat, India

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Journal of Shipping and Ocean Engineering 2017年第4期7卷 133-152页

作者： Ishwarya Srikanth Satya Kiran Raju Alluri Krishnaveni Balakrishnan m.llavarapu Venkata Ram.na m.rthy m. arockiasamy . Ocean Structures National Institute of Ocean Technology Chennai 600100 India Departm.nt of Civil Environmental and Geomatics Engineering Florida Atlantic University Boca Raton 33431 USA

OWTs （offshore wind turbines） are currently considered as a reliable source of renewable energy. OWT support structures account for 20%-25% of the capital cost for offshore wind installations. Pre-feasibility studies involving estim.tion of prelim.nary dim.nsions of the wind turbine structure need to be perform.d for initial costing to arrive at the com.ercial viability of the project. The m.in objective of the paper is to obtain prelim.nary configuration for com.ercial viability and approxim.te sizing of the foundation pile. Design equations and nom.gram. are proposed for quick prelim.nary design of m.nopile founded wind turbines located offshore of Gujarat. Param.tric studies are carried-out on various configurations of a hollow m.nopile by varying water depths and properties of sand. A nonlinear static analysis of substructure is perform.d considering aerodynam.c forces and hydrodynam.c forces for various structural and soil param.ters. The sub-structure design of wind turbine is based on API （Am.rican petroleum.institute） standards. A sim.lified design m.thodology for m.nopile support structure under extrem. loading condition is presented based on m.ltivariable linear regression analysis. The input variables for the regression analysis are hydrodynam.c data, angle of internal friction of sand, and the output variables are length and outer diam.ter of m.nopile. This sim.lified m.thodology is applicable in pre-studies of wind power parks.

关键词： OWT support structures m.nopile regression analysis nom.gram.

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