RESEARCH ARTICLE


Research on Advanced Analysis Method of Semi-Rigid Steel Frames



Liu Wei, Shu Ganping, Chan Siulai
College of Civil Engineering, Southeast University, Nanjing, Jiangsu, 210096, P.R. China.


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Creative Commons License
© 2015 Wei et al;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the College of Civil Engineering, Southeast University, Nanjing, Jiangsu, 210096, P.R. China; Tel: +86 15055132115; E-mail: lwdd001@163.com


Abstract

The advanced analysis method used to analyze semi-rigid steel frames is introduced, and the method could take account of many factors influencing structure mechanical performance. These factors include: initial imperfect mode of structure and members, geometrical nonlinearity (P-∆, P-δ effects), material nonlinearity and semi-rigid connections. The Curved Stability Function (CSF) element is built to take account of initial imperfect state, semi-rigid connections and plastic hinge, and derivatives of the second-order element stiffness matrix to extend the spatial element stiffness matrix. The nonlinearity behavior of semi-rigid connections and plastic hinge are simulated by the spring element. Judgment criteria of plastic hinge and spring stiffness values are determined, as well as of the structure failure. The three semirigid steel frames are directly analyzed by the program named NIDA, and the results of NIDA are comparatively analyzed with test results. It is indicated that the results of NIDA are better compared to the test results, verifying validity and reliability of the advanced analysis method used to analyze semi-rigid steel frames.

Keywords: Curved stability function element, initial imperfect, plastic hinge, semi-rigid steel frames, the advanced analysis method.