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IRJET- Dynamic Analysis and Response of K Type & KT Type Fixed Jacket Offshore Substructure
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Processing & Properties of Floor and Wall Tiles.pptx
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IRJET- Dynamic Analysis and Response of K Type & KT Type Fixed Jacket Offshore Substructure
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 219 DYNAMIC ANALYSIS AND RESPONSE OF K TYPE & KT TYPE FIXED JACKET OFFSHORE SUBSTRUCTURE Gokul Raj S[1], KRP. Satheeshkumar[2] 1PG STUDENT CE, KUMARAGURU COLLEGE OFTECHNOLOGY, COIMBATORE, TAMIL NADU, INDIA 2ASSISTANT PROFESSOR CE, KUMARAGURU COLLEGE OF TECHNOLOGY, COIMBATORE, TAMIL NADU, INDIA ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Dynamic Analysis of the structure is considered to be one of the important tool for understanding the structures behavior under diverse environmental conditions and to understand performance of thestructureunder various combinational loads. The main motto of this project is to model and analyze a moment resisting offshore substructure by varying the joints as K Joint and K T Joint. The substructure was analyzed for Airy’s wave function with various load combinations. Brief study was carried out on behavior of the substructure under dynamic loads. The mode shapes was determined and natural frequency and natural time period were compared for K Joint and KT Joint. Wave height was assigned using Design Wave method. It was found that for the system analyzed, the base shear for K joint was 120 KN and with max displacement of 0.120 m and for K T joint base shear was 135 KN and with max displacement of 0.075 m. Key Words: K Joint, KT Joint, Mode Shapes, Natural Frequency, Airy’s Wave, offshore Substructure. 1. INTRODUCTION Offshore construction is the installation of structures and facilities in a marine environment, usuallyfortheproduction and transmission of electricity, oil, gas and other resources. It is also called maritime engineering. Construction and pre- commissioning is typically performed as much as possible onshore. To optimize the costs and risks of installing large offshore platforms, different construction strategies have been developed. One strategy is to fully construct the offshore facility onshore, and tow the installation to site floating on its own buoyancy. Offshore structures have special economicandtechnical characteristics.Economically, offshore structures are dependent on oil andgasproduction, which is directly related to global investment, which is in turn affected by the price of oil. For example, in 2008 oil prices increased worldwide, and as a result many offshore structure projects were started during that time period. Technically, offshore structure platform design and construction are a hybrid of steel structure design and harbor design and construction. In this study Airy’s function were used to impart the wave loads to the substructure. The analysis was performed only for the substructure of the offshore platform. 2. METHODOLOGY Dynamic analysis of fixed offshore Substructure for K Joint & KT Joint was performed to visualize the response under various combinational loads like wind load,seismicload,and wave load. To study the response of the structure Response Spectrum Analysis was performed for K joint & KT joint of offshore Substructure model using SAP2000. Methodology can be summarized as below The model of K Joint & KT Joint Substructure was modelled using SAP2000. Modal analysis was performed tovisualizethemode shapes of the K Joint & KT Joint offshore Substructure. Response Spectra analysis was performed to the K joint & KT Joint offshore Substructure to visualize the peak acceleration experienced by the Substructures. 3. DESCRIPTION OF MODEL Platform Orientation 135° w.r.t Grid North Overall Dimension 18.2 m x 24.15 Water depth 22 m w.r.t MSL Design Life 30 Years The platform considered in the study is a six legged production platform. Water depth at the location is 200 m. The platform is designed based on the API recommended criteria for 50 years return period. In the study a structure made of steel is used with fixed base for calculation. The type of steel used is A36. A36 has a density of 7,800kg/m3Young’s modulus for A36 steel is 200 GPa, Poisson’s ratio of 0.26,
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 220 shear modulus of 75 GPa. Total height of the structure is 200m. Overall Dimension of the Structure 18.2 m X 24.15m. All the vertical legs and the diagonal bracings are 1.5m diameter and wall thickness is 0.075m. The horizontal bracings are 0.650 m diameter and wall thickness is 0.035m. The computer 3D model of the structure is shown in below fig1 represents the K joint and KT Joint Offshore Substructure. Fig 1 Represents K Joint & KT Joint The sectional properties of K joint & KT Joint consistingLegs, Vertical brace are tabulated Shown below Table 1 4. Environmental Loads The offshore substructure is going to experience various adverse loadings like wind load, wave load, seismic loads other than the gravity loads. 4.1 Wave load Wave loads are determined by two methods by design wave method and spectral method. The forces exerted by waves are most dominant in governing the jacket structuresdesign especially the foundation piles. The wave loads exerted on the jacket is applied laterally on all members and it generates overturning moment on the structure. The wave loads were assigned based on Airy’s wave theory.Thebelow shown figure represents wave loading to the substructures. Fig 2 Wave Loading The maximum design wave height can be determined using design wave method Maximum wave by empirical formula Hmax = 1.86 HS 4.2 Loads cases Various load like wind load, seismic load were assigned for nonlinear static types to study the response of the structure due to various adverse loading. Load cases defined to study the response is shown in the below figure. Fig 3 Load cases 5. Modal Analysis Modal analysis was performed for the K joint & KT joint to visualize the mode shapes and modal mass participation of the K Joint and KT Joint offshoreSubstructure.Modesshapes for K Joint & KT Joint is represented in the following figures fig2,3 Description Diameter (mm) Wall thickness (mm) Legs (Ungrouted) 1500 75 Horizontal Chords 650 35 Inclined Braces 650 35
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 221 Fig -2: Mode shapes of K Joint Fig 3 Mode shapes of KT Joint Every structure has its own natural time period and natural frequencies, so, modal analysis was performed todetermine the natural frequencies, and natural time period of the K Joint & KT Joint offshore substructureandthenatural period and natural frequency was tabulated in tables 2 & 3 shown below. Table 2 Mode Natural Frequency (cyc/sec) Natural time Period (sec) Mode1 4.64 0.215 Mode2 4.67 0.213 Mode3 6.24 0.160 Mode4 14.98 0.064 Table 3 Mode Natural Frequency (cyc/sec) Naural time Period (sec) Mode1 4.35 0.229 Mode2 5.82 0.171 Mode3 6.43 0.155 Mode4 16.45 0.069 From the modal analysis performed for K Joint & KT joint offshore substructures it was found that K Joint offshore Substructure model experienced lesser natural period and natural frequency than that of the KT Joint offshore substructure model. Therefore, as known, structure with lesser time period is considered to be more stable so the K Joint was considered to be more stable than KT Joint substructure. Fig 4 Comparison Mode shapes and Natural Frequency 5. Response Spectra Analysis In extreme cases, where structures are either too irregular, too tall or of significance to a community in disaster response, the response spectrum approach is no longer appropriate, and more complex analysis is required, such as non-linear static or dynamic analysis like in seismic performance analysis technique. Pseudo Spectral acceleration that describes the maximum acceleration in an earthquake on an object – specifically a damped, harmonic oscillator moving in one physical dimension. The below shown figures 4,5 represents the Spectral Acceleration for K Joint & KT Joint Fixed Offshore Substructure. Fig 4 Frequency Vs Pseudo Spectral Acceleration K Joint Substructure
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 222 Fig 5 Frequency Vs Pseudo Spectral Acceleration KT Joint Substructure From the analysis it was found the joint 25 of K joint and joint 13 of KT Joint experienced greater accelerationthatthe joints near the free end was less. 6. CONCLUSIONS The offshore substructure model was modeled and analyzed with wave loading using using airy’s wave theory using design wave method. The response of the offshore substructure under various combination of environmental loads were studied. The modal analysis was performed and mode shapes weredetermined withnatural frequencyand natural period for the offshore structure. The modal analysis was performed for K Jointand K T joint and were compared, from the analysis it was found that 4th mode shape was found to be predominant with natural frequency of 14.98 for K Joint and 16.45 for KT joint and had a mass participation factor 90%. Response Spectra curves where plottedtostudythe response of the K joint KT joint and was found that the joint 25 near base experienced maximum acceleration than the joints at free end. The KT Model had displacement of 0.025m which was comparatively less that K joint model which had a displacement 0.03m, so KT model possessed less displacement than KT Model. KT joint structure have lesser time period of 1.5 sec than the K joint Structure 2 sec, so lesser the time period more stable is the structure. By overall comparison KT model performed was found to be better than K joint Model. REFERENCES [1] API (American Petroleum Institute) recommended practice 2A-WSD (RP 2A-WSD) 21st edition (2000) for design of offshore structures, USA. [2] API RP 2A – WSD, "Recommended Practice forPlanning, Designing and Constructing Fixed Offshore Platforms – Working Stress Design, 21TH Edition, 2000". [3] Sadeghi K, ''Coasts, Ports and Offshore Structures Engineering’’ -2001. [4] Merin Thomas1, Diana Augustine (2018) Fatigue analysis of offshore steel structures International Research Journal of Engineering and Technology Volume: 05 Issue: 04. [5] Vaibhav Dahiwalkar Behaviour of Jacket Platform Subjected to Ship Impact International Journal of Engineering Research & Technology Vol. 4 Issue 08, August-2015.
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