Effect of Semi-rigid Connection on Post-buckling Behavior of Braced-Steel Frames

  • Douaa R. Mohammed
  • Murtada A. IsmaelEmail author
Conference paper
Part of the Lecture Notes in Civil Engineering book series (LNCE, volume 53)


Practically, rigid beam-column connection has a relative flexibility which reduces their resistance to moments and this lead to partially restrained connection which is called semi-rigid connection. This research presents a numerical analysis using finite element method by ANSYS software to predict the effect of semi-rigid beam-column connections on post-buckling behavior of braced and unbraced frames and make a comparison between them. The beam and column of the frames were modeled using beam element and the semi-rigid connections were modeled as rotational springs with different rotational stiffness values in linear elastic stage. The results show that, the load-displacement curve of the braced frame is less affected by changing the beam-column connection from rigid to semi rigid with different rotational stiffness values as compared with that of the unbraced frame although this changing has slight effect on the ultimate vertical displacement. Also the results show that the semi-rigid connection should be take into account in analysis and design of braced and unbraced steel frames to obtain more realistic results.


Post-buckling Semi-rigid connection Braced Steel Frames 



It is a great pleasure to acknowledge my thanks and gratitude to my supervisor Asst. Prof. Dr. Murtada A. Ismael for his valuable guidance and his advices throughout this work and I would like to thank all staff of Civil Engineering Department, University of Diyala, Iraq.


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© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Department of Civil EngineeringCollege of Engineering, University of DiyalaBaqubahIraq

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