Compactness requirements of RBS connections

Vasseghi, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. Flexible steel frame system is the most common structural system for mid-rise buildings. Northridge earthquake is turning point in designing flexible steel frames and their connections. During this earthquake a large number of beam-column connections in such structures were ruptured in a brittle manner. After this earthquake many researches were conducted on a variety of beam-column connections with an aim of improving their behavior during earthquake. One such connection which have been studied extensively both experimentally and analytically is a connection with Reduced Beam Section (RBS). The most important advantage of this connection is its high ductility and its ability to dissipate the seismic energy through inelastic deformation. Experimental and analytical studies on RBS connections are limited to rolled beam sections with limited web and flange slenderness ratios. However, in most developing countries deep rolled sections are not readily available and structural engineers are forced to use plate girders instead. In this paper behavior of RBS connections in plate girders with various slenderness ratios is studied using nonlinear finite element analysis. The analysis simulates inelastic local buckling of the girder as ductility and energy dissipating capacity of the connection is directly influenced by such inelastic behavior. The analytical model is first verified with results of a full scale experiment on a RBS connection. Then, twelve RBS connections with various web and flange slenderness ratios are analyzed to evaluate the effect of slenderness ratios on ductility of the connection. The results indicate that FEMA-350 requirements for maximum slenderness ratios of web and compression flange are very conservative
  4. Keywords:
  5. RBS connection ; Structure ; Beams and girders ; Buckling ; Concrete beams and girders ; Developing countries ; Ductility ; Earthquakes ; Finite element method ; Flanges ; Geophysics ; Mechanics ; Seismology ; Steel ; Steel construction ; Structural design ; Structural frames ; Structure (composition) ; Beam - column connection ; Common structural systems ; Compactness ; Full-scale experiment ; Inelastic deformation ; Non-linear finite-element analysis ; Northridge earthquakes ; Seismic ; Plates (structural components)
  6. Source: Advances and Trends in Structural Engineering, Mechanics and Computation - Proceedings of the 4th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2010, 6 September 2010 through 8 September 2010 ; 2010 , Pages 663-666 ; 9780415584722 (ISBN)