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Development of Nonlinear Analysis Technic to Determine the Ultimate Load in Electric Transmission Tower  

Kim, Woo Bum (공주대학교 건축공학과)
Choi, Byong Jeong (경기대학교 건축공학과)
Ahn, Jin Kyu (공주대학교 건축공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.20, no.3, 2008 , pp. 389-398 More about this Journal
Abstract
The current design practice of electric transmission tower is based on the allowable stress design. However, it is difficult to find the cause behind a transmission tower's collapse by the above design approach as the collapse is caused by large secondary deformations based on and geometrical nonlinear behavior.influence factor for the nonlinear behavior is mainly residual stress, initial imperfection and end restraints on members. In this study, the necessity of the nonlinear analysis is examined through the comparison between elastic ana the nonlinear analysis, a new analytical method (equivalent nonlinear analysis technique) is proposed. To confirm the reliability of the proposed method, the computed ultimate load of the transmission tower using the method was compared with that of the nonlinear finite element analysis. Effects of parameters, such as compressive force and the slenderness ratio of the brace member on the main post member, were investigated. The effective member length according to influential parameters was formulated in table form for practical purposes.
Keywords
electric transmission tower; nonlinear analysis; ultimate load;
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