Seismic Behaviour of Offshore Steel Jacket Platform Braced in Horizontal and Vertical Planes
Yousuf Ahmed1, Aravind Kumar Harwalkar2
1Md. Yousuf Ahmed PG Student, Department of Civil Engineering, PDA College of Engineering Kalaburgi, Karnataka, India.
2Dr. Aravind Kumar Harwalkar Associate Professor Department of Civil Engineering, PDA College of Engineering Kalaburgi, Karnataka, India.
Manuscript received on September 16, 2019. | Revised Manuscript received on 24 September, 2019. | Manuscript published on October 10, 2019. | PP: 1947-1953 | Volume-8 Issue-12, October 2019. | Retrieval Number: L28961081219/2019©BEIESP | DOI: 10.35940/ijitee.L2896.1081219
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The offshore jacket platforms are primarily installed in the large oceans mainly for drilling the crude oil, carbohydrates and production of electricity. The current studies emphasize on the structural performance of offshore deck jacket platform with different bracing systems. Earthquake analysis has been performed to calculate the seismic responses, with the help of bracings to control the seismic induced vibrations of the jacket platforms. For this study, a jacket platform made up of steel members has been modeled and then analyzed under earthquake and wave loadings. This paper mainly deals to compute and compare the seismic behavior of offshore steel deck platform using SAP 2000 v20 software with bracing in the horizontal plane and bracing in both horizontal and vertical planes. The total number of 8 models has been analyzed in the SAP2000 software with bracing i.e. X, V, Inverted V and K in the vertical plane and bracing i.e. X, V, Inverted V and K in both horizontal and vertical plane. A relative study has been carried out in Time period, deck displacement and base shear. Seismic analysis using linear static, i.e. Equivalent static method (ESA) and linear dynamic, i.e. Response spectrum method (RSA) has been performed. Further deck displacement, time period and base shear are determined by Equivalent static method and Response spectrum method for various types of bracing models in both horizontal and vertical planes. Among the all various types of bracing models, Inverted V bracing in the vertical plane is found to be the optimum model among all other models.
Keywords: Offshore Steel Jacket Platform, Base Shear, Time period, ESA, RSA, SAP2000 v20 software.
Scope of the Article: Behaviour of Structures under Seismic Loads