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Steel and Composite Structures
  Volume 37, Number 5, December10 2020 , pages 571-587
DOI: https://doi.org/10.12989/scs.2020.37.5.571
 


Experimental and analytical study in determining the seismic performance of the ELBRF-E and ELBRF-B braced frames
Habib Ghasemi Jouneghani and Abbas Haghollahi

 
Abstract
    In this article the seismic demand and performance of two recent braced steel frames named steel moment frames with the elliptic bracing (ELBRFs) are assessed through a laboratory program and numerical analyses of FEM. Here, one of the specimens is without connecting bracket from the corner of the frame to the elliptic brace (ELBRF-E), while the other is with the connecting brackets (ELBRF-B). In both the elliptic braced moment resisting frames (ELBRFs), in addition to not having any opening space problem in the bracing systems when installed in the surrounding frames, they improve structure' ss behavior. The experimental test is run on 1/2 scale single-story single-bay ELBRF specimens under cyclic quasi-static loading and compared with X-bracing and SMRF systems in one story base model. This system is of appropriate stiffness and a high ductility, with an increased response modification factor. Moreover, its energy dissipation is high. In the ELBRF bracing systems, there exists a great interval between relative deformation at the yield point and maximum relative deformation after entering the plastic region. In other words, the distance from the first plastic hinge to the collapse of the structure is fairly large. The experimental outcomes here, are in good agreement with the theoretical predictions.
 
Key Words
    elliptic braced moment resisting frame; lateral bracing system; experimental behavior; seismic demand; seismic performance; nonlinear static pushover analysis; energy absorption
 
Address
Habib Ghasemi Jouneghani and Abbas Haghollahi: Department of Civil Engineering, Faculty of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran
 

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