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On the characteristics and design of yielding elements used in steel-braced framed structures

Tajammolian, H ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1002/tal.669
  3. Publisher: 2013
  4. Abstract:
  5. In this paper, the behavior of a concentric braced frame structure equipped with yielding elements (YE), based on energy concepts, has been investigated extensively. When a severe earthquake occurs, energy will get absorbed through structural elements, which causes destruction. In order to reduce structural damage, input energy should be dissipated. YE will act as a fuse and absorb a great deal of earthquake input energy. Two one-story steel frames with different bay-to-height ratios (B/H < 1 and B/H > 1) are investigated. YE is located in the braces intersection. First, through studying the elastic behavior of the frame, the best location, angle and shape of YE is proposed. Subsequently, a nonlinear dynamic analysis has been implemented to obtain the frames' response in different ground motions. In addition, the ratio of 'dissipated energy by yielding elements' to 'total entering energy of structure' is further calculated. Finally, an approximate method is presented for estimating the nonlinear behavior of the braced frame equipped with YE. This approximation transfers a complex problem into a set of practical graphs and charts. The comparison of the results between suggested method and time history analysis indicates very reasonable agreement between the two techniques
  6. Keywords:
  7. Ductility demand ; Seismic behaviour ; Steel brace ; Bilinear models ; Ductility demands ; Input energy ; Bilinear model ; Steel braces ; Yielding element ; Approximation theory ; Earthquakes ; Energy dissipation ; Structural frames
  8. Source: Structural Design of Tall and Special Buildings ; Volume 22, Issue 2 , 2013 , Pages 179-191 ; 15417794 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/tal.669/abstract