âComputational Civil Engineering - "Intersections" International Journal

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“Computational Civil Engineering 2005”, International Symposium 151Case 4: Wave forces H=14.10 m, wind and current θ = 225°axis, (W e for θ = 225°)Case 5: Wave forces H=14.10 m, wind and current θ = 270°axis, (W e for θ = 270°)with respect to Ywith respect to Yθ = 0°FATA Iθ = 45°9000Yθ = 270°θ = 90°FATA IIXFATA IV9000θ = 225°30005000FATA III1800010000Figure 3 – Directions for wave and current loadsThe sectional stresses (characteristic values) coming from these 2+5 loading casesare necessary to perform the resistance and stability checks for the structuralelements of the jacket and for the resistance checks of the tubular jointsrespectively.The maximum values of the sectional stresses are obtained by multiplication of thesectional stresses, determined according to the procedure presented above, throughcoefficients corresponding to hypotheses Q1 and Q2.4. EVALUATION OF LOADS COMING FROM D1, D2, L1, L2 ANDWIND ACTIONThe values and positions of the loads coming from D1, D2, L1 and L2 on deckswere established through survey of the specific equipments existing on decks butalso by considering the technical data concerning the volume and the self weight ofsome installations, including live loads. For the evaluation of wind loads, theappropriate exposed surfaces are calculated, inclusive the perimeter protectionshields disposed at levels 12.500 and +22.500.The exposed surfaces for the wind action directions (θ), are:
152 Al. Dima, I.R. RăcănelFor θ = 0° and θ = 180° ......... ................................... A 1 = 110.0 m 2For θ = 45°,θ = 135° ; θ = 225° and θ = 315°........... A 2 = 137.0 m 2For θ = 90° and θ = 270° .......... ..................................A 3 = 56.0 m 2The wind loading hypotheses are taken according to the extreme wave loadinghypotheses θ = 0°, θ = 45°, θ = 90°, θ = 225° and θ = 270° and they were coupledwith each wave loading direction according to the load cases 3, 4, 5 and 6.5. THE EVALUATION OF MAXIMUM WAVE LOAD FORCES ANDCURRENT FORCESFor the computation of the maximum values of sectional stresses in structuralelements from wave and marine current action, necessary to form Q2 hypothesis, inorder to perform the resistance and stability checks, the load components at thejoints of the finite element model are used. The forces corresponding to waves arecomputed for H=14.1 m water height with a period of 10.2 sec. For the forcescoming from marine current, the current velocity was taken 1.10 m/s at the watersurface and 0.28 m/s at sea floor, according to the data from ICIM Bucureşti, givenfor all 5 directions of extreme wave.a) Mode 1 – T=1.207 sec. b) Mode 2 – T=0.985 sec. c) Mode 3 – T=0.686 sec.Figure 4 – Deformed shapes from dynamic analysisThe considered marine growth have a thickness about 0.08 m/radius till a waterdepth of 25 m and a thickness of 0.04 m/radius below this level.
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