RESEARCH PAPERS: Offshore Mechanics

An Improved Joint Model and Equations for Flexibility of Tubular Joints

[+] Author and Article Information
Y. Ueda, K. Nakacho

Welding Research Institute, Osaka University, Osaka, Japan

S. M. H. Rashed

Century Research Center Corporation, Osaka, Japan

J. Offshore Mech. Arct. Eng 112(2), 157-168 (May 01, 1990) (12 pages) doi:10.1115/1.2919850 History: Received January 01, 1989; Revised May 05, 1989


In tubular frames with simple joints, joints may show considerable flexibility in the elastic as well as the elastic-plastic ranges. Such flexibility may have large effects on the behavior of the structure as a whole. In a previous paper, an effective simple model of tubular joints is developed. The model takes account of joint flexibility in the elastic as well as the elastic-plastic ranges based on elastic-fully plastic load-displacement relatioships. In this paper an improved joint model is presented to provide better accuracy while maintaining simplicity. The accuracy of the model is confirmed through comparisons with results of finite element analysis. Equations to evaluate the initial stiffness of tubular T and Y-joints when braces are subjected to axial compression or in-plane bending moment are also presented. Such equations for different types of joints in different loading conditions are needed in order to avoid expensive calculations to evaluate the initial stiffness of joints.

Copyright © 1990 by The American Society of Mechanical Engineers
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