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RISS 인기검색어
- 검색키워드
- 저자 : R. Sundaravadivelu (검색결과 3 건)
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Dynamic analysis of slack moored spar platform with 5 MW wind turbine
Seebai, T.,Sundaravadivelu, R. Techno-Press 2011 Ocean systems engineering Vol.1 No.4
Spar platforms have several advantages for deploying wind turbines in offshore for depth beyond 120 m. The merit of spar platform is large range of topside payloads, favourable motions compared to other floating structures and minimum hull/deck interface. The main objective of this paper is to present the response analysis of the slack moored spar platform supporting 5MW wind turbine with bottom keel plates in regular and random waves, studied experimentally and numerically. A 1:100 scale model of the spar with sparD, sparCD and sparSD configuration was studied in the wave basin ($30{\times}30{\times}3m$) in Ocean engineering department in IIT Madras. In present study the effect of wind loading, blade dynamics and control, and tower elasticity are not considered. This paper presents the details of the studies carried out on a 16 m diameter and 100 m long spar buoy supporting a 90 m tall 5 MW wind turbine with 3600 kN weight of Nacelle and Rotor and 3500 kN weight of tower. The weight of the ballast and the draft of the spar are adjusted in such a way to keep the centre of gravity below the centre of buoyancy. The mooring lines are divided into four groups, each of which has four lines. The studies were carried out in regular and random waves. The operational significant wave height of 2.5 m and 10 s wave period and survival significant wave height of 6 m and 18 s wave period in 300 m water depth are considered. The wind speed corresponding to the operational wave height is about 22 knots and this wind speed is considered to be operating wind speed for turbines. The heave and surge accelerations at the top of spar platform were measured and are used for calculating the response. The geometric modeling of spar was carried out using Multisurf and this was directly exported to WAMIT for subsequent hydrodynamic and mooring system analysis. The numerical results were compared with experimental results and the comparison was found to be good. Parametric study was carried out to find out the effect of shape, size and spacing of keel plate and from the results obtained from present work ,it is recommended to use circular keel plate instead of square plate.
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Retrofitting of RC Piles using GFRP Composites
Purushotham Reddy,P. Alagusundaramoorthy,R. Sundaravadivelu 대한토목학회 2009 KSCE JOURNAL OF CIVIL ENGINEERING Vol.13 No.1
Extensive research has been carried out in recent years on the use of Fibre-Reinforced Polymer (FRP) composites in the strengthening of Reinforced Concrete (RC) structures. The piles in berthing structures need to be retrofitted to accommodate berthing of higher Dead Weight Tonnage (DWT) vessels. This paper presents the Finite element analysis, to study the behavior of retrofitted RC Pile specimens strengthened with Glass Fiber Reinforced Polymer (GFRP) composites using commercial software ANSYS. Experiments were also conducted to justify the finite element analysis results. Eight RC pile specimens were cast with same reinforcement details to study the behavior under different loading conditions. Four specimens were used as control and remaining four were retrofitted with GFRP fabric. The effect of retrofitting on RC pile specimens was studied. The load deflection and load strain plots obtained from numerical study is compared with the experimental plots. The crack patterns in the pile specimens are also presented. A parametric study is carried out to investigate the effect of various parameters on the strength of RC piles. The parameters include unconfined concrete strength, the steel ratio and the thickness of FRP.
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Ultimate Strength of Orthogonal Stiffened Plates Subjected to Axial and Lateral Loads
M. Suneel Kumar,C. Lavana Kumar,P. Alagusundaramoorthy,R. Sundaravadivelu 대한토목학회 2010 KSCE Journal of Civil Engineering Vol.14 No.2
Orthogonal stiffened plates present in the ship deck are subjected to axial compression due to hogging and sagging bending moments and, lateral load due to cargo load. The main objective of this investigation is to determine the ultimate load carrying capacity and study the interactive behaviour of orthogonal stiffened plates under axial and lateral loads. Tests were conducted on six stiffened plates with plate slenderness ratios of 80 and 64, and corresponding column slenderness ratios of 24 and 26. Hydraulic jacks and inflatable air balloon with load control mechanism were fabricated to apply axial and lateral loads on the test specimens respectively. All the specimens were tested up to ultimate load and the mode of failure was determined based on the initial yielding observed in the plate and/or stiffener. Nonlinear finite element analysis of test specimens was performed using the general purpose FE software ANSYS®. Both material and geometric nonlinearities were considered in the FE analysis of test specimens. The ultimate loads obtained from the finite element analysis were compared with experimental data and found to be satisfactory. It was also observed that the mode of failure obtained from finite element analysis is similar as observed from experiments. It was concluded that the increase in lateral load beyond two thirds of ultimate lateral load significantly reduces the axial ultimate load carrying capacity of stiffened panels. The interactive effect of stiffened plates subjected to combined action of axial and lateral loads is determined as nonlinear.
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