Table of Contents
ISRN Mechanical Engineering
Volume 2011 (2011), Article ID 795764, 9 pages
http://dx.doi.org/10.5402/2011/795764
Research Article

Numerical Study on the Strength of Pipe Joints

Department of Mechanical Engineering, Tokyo University of Science, Kagurazaka 1-3, Shinjuku-ku, Tokyo 162-8601, Japan

Received 6 July 2011; Accepted 18 August 2011

Academic Editors: D. Aggelis, A. E. Huespe, and D. Zhou

Copyright © 2011 Dai-Heng Chen and Kenichi Masuda. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

With respect to the collapse behavior of joints in a steel pipe truss structure, in the present study, we carry out numerical analyses using a general-purpose FEM software package on the yield strength and the stress distribution near the connection in order to obtain information on the collapse behavior and the yield strength of joints. 𝑇 -joint and π‘Œ -joint are investigated. It is found that the joint strength is proportional to the πœ† th power of thickness 𝑇 of a main tube for various joints with a fixed branch-to-chord diameter ratio 𝑑 / 𝐷 . The index πœ† changes with 𝑑 / 𝐷 and in the range of 𝑑 / 𝐷 = 0 . 1 to 0.91, πœ† β‰… 1 . 9 3 to 1.55 holds with smaller values corresponding to larger 𝑑 / 𝐷 . A compressive axial force along the main tube will reduce the joint strength, and it is also found that the strength-reduction ratio for π‘Œ -joint is almost the same as that for 𝑇 -joint having the same 𝑇 and 𝑑 / 𝐷 . Also, the joint strength is influenced by the span length of the main tube. The joint strength decreases as the span length increases. However, the influence is small for small 𝑑 / 𝐷 .