Vibration Analysis of Welded Tubular Structures Considering Local Joint Flexibility
American Journal of Mechanics and Applications
Volume 5, Issue 5, September 2017, Pages: 41-46
Received: Dec. 5, 2017; Published: Dec. 6, 2017
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Authors
Yamin Wang, School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, China
Yongbo Shao, School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, China
Shanshan Tu, School of Civil Engineering, Yantai University, Yantai, China
Dongping Yang, Technology Inspection Centerr, China Petroleum & Chemical Corporation, Dongying, China
Gengqi Niu, Technology Inspection Centerr, China Petroleum & Chemical Corporation, Dongying, China
Fengle Long, Technology Inspection Centerr, China Petroleum & Chemical Corporation, Dongying, China
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Abstract
Welded tubular structure is the backbone of offshore jacket platform. As a thin-walled structure, local joint flexibility (LJF) in a tubular structure is prominent, and it may produce significant effect on the dynamic performance for the overall structure. This study presents a simplified model to analyze the dynamic behavior of a steel tubular structure with LJF. The presented model simplifies a tubular structure into a frame model consisted of beam elements with considering the LJFs at the connections between any two elements. The LJF is simulated with a fictitious beam element (FBE). Methods for defining the dimensions of the cross section and the material properties of the FBE are provided. The accuracy of the presented method is verified through comparing with three dimensional (3D) finite element results on the vibration of a tubular structure. The tested results indicate that LJF has remarkable effect on the vibration of welded tubular structures, and the simplified model presented in this study can provide more accurate estimation compared to conventional rigid frame model.
Keywords
Welded Tubular Structure, Local joint Flexibility (LJF), Simplified Model, Fictitious Beam Element (FBE), Vibration
To cite this article
Yamin Wang, Yongbo Shao, Shanshan Tu, Dongping Yang, Gengqi Niu, Fengle Long, Vibration Analysis of Welded Tubular Structures Considering Local Joint Flexibility, American Journal of Mechanics and Applications. Vol. 5, No. 5, 2017, pp. 41-46. doi: 10.11648/j.ajma.20170505.11
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