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Local joint flexibility element for offshore plateforms structures
Institution:1. Sharif University of Technology, Department of Civil and Environmental Engineering, Tehran, Iran;2. Structural Engineering, Sharif University of Technology, Tehran, Iran;3. Structural Engineering, K.N. Toosi University of Technology, Tehran, Iran;1. Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, PR China;2. School of Aeroplane, Mechanical and Manufacturing Engineering, RMIT University, PO Box 71, Bundoora, Victoria 3083, Australia;1. Department of Mechanical Engineering, Linköping University, S-581 83 Linköping, Sweden;2. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109-2125, USA;3. Department of Engineering and Architecture, University of Parma, Viale Usberti 181/A, 43124 Parma, Italy;1. Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI, USA;2. Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, USA;1. DNV GL SE, Hamburg, Germany;2. University of Duisburg-Essen, Germany;3. National Technical University of Athens, Greece;4. Hamburger Schiffbau-Versuchsanstalt, Hamburg, Germany;5. Nanyang Technological University, Singapore;1. Queen''s School of Engineering, University of Bristol, BS8 1TR, UK;2. Department of Civil and Environmental Engineering, University of Surrey, GU2 7XH, UK
Abstract:A large number of offshore platforms of various types have been installed in deep or shallow waters throughout the world. These structures are mainly made of tubular members which are interconnected by using tubular joints. In tubular frames, joints may exhibit considerable flexibility in both elastic and plastic range of response. The resulting flexibility may have marked effects on the overall behavior of offshore platforms.This paper investigates the effects of joint flexibility on local and global behavior of tubular framed structures in linear range of response. A new joint flexibility element is developed on the basis of flexibility matrix and implemented in a finite-element program to account for local joint flexibility effects in analytical models of tubular framed structures. The element formulation is considerably easy and straightforward in comparison with other existing tubular joint elements. It was concluded that developed flexible joint model produces accurate results comparing to sophisticated multi-axial finite element joint models.
Keywords:Joint flexibility  Chord  Brace  Tubular framed structure  Flexibility matrix
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