Steel and Composite Structures

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The effect of RBS connection on energy absorption in tall buildings with braced tube frame system

  • Shariati, Mahdi (Division of Computational Mathematics and Engineering, Institute for Computational Science, Ton Duc Thang University) ;
  • Ghorbani, Mostafa (Department of Civil, Babol Noshirvani University of Technology) ;
  • Naghipour, Morteza (Department of Civil, Babol Noshirvani University of Technology) ;
  • Alinejad, Nasrollah (Department of Civil, Babol Noshirvani University of Technology) ;
  • Toghroli, Ali (Institute of Research and Development, Duy Tan University)
  • Received : 2019.08.17
  • Accepted : 2019.12.01
  • Published : 2020.02.25
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Abstract

The braced tube frame system, a combination of perimeter frame and bracing frame, is one of the systems used in tall buildings. Due to the implementation of this system in tall buildings and the high rigidity resulting from the use of general bracing, providing proper ductility while maintaining the strength of the structure when exposing to lateral forces is essential. Also, the high stress at the connection of the beam to the column may cause a sudden failure in the region before reaching the required ductility. The use of Reduced Beam Section connection (RBS connection) by focusing stress in a region away from beam to column connection is a suitable solution to the problem. Because of the fact that RBS connections are usually used in moment frames and not tested in tall buildings with braced tube frames, they should be investigated. Therefore, in this research, three tall buildings in height ranges of 20, 25 and 30 floors were modeled and designed by SAP2000 software, and then a frame in each building was modeled in PERFORM-3D software under two RBS-free system and RBS-based system. Nonlinear time history dynamic analysis is used for each frame under Manjil, Tabas and Northridge excitations. The results of the Comparison between RBS-free and RBS-based systems show that the RBS connections increased the absorbed energy level by reducing the stiffness and increasing the ductility in the beams and structural system. Also, by increasing the involvement of the beams in absorbing energy, the columns and braces absorb less energy.

Keywords

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