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Progressive Collapse Due to Sudden Column Removal in Steel Moment and Eccentric Braced Frames

Moosadoost, Ali Asghar | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 52123 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Khaloo, Alireza; Kazemi, Mohammad Taghi
  7. Abstract:
  8. With increasing population and lack of habitable spaces, the building heights increased in cities around the world. Placing components of a structure in tandem may cause a permanent failure of the members due to strength reduction. During recent years, this kind of failure occurred in different places of the world, and is called progressive collapse. There are some various samples of the progressive collapse which all are good samples of failures such as building failure in Ronan Point in the UK, Twin Towers or the world trade center in NY, and Pentagon building. According to these issues, different institutions codified guidelines and codes in this field such as Department of Defense as DoD code or General Services Administration (GSA) related to the USA. The progressive collapse analysis methods and also acceptance criteria or the structure non-acceptance due to resistant or strength against the progressive collapse can be observed in these mentioned codes or guidelines. The progressive collapse is defined as a local failure distribution of the structure to the whole. In recent years, researchers have focused on this issue as well as the building design codes. In this study, the steel building strength against the progressive collapse has been reviewed by using the alternate path method which advised in DoD code. There are different scenarios used in this code for column removal and its analysis methods. The linear static analysis method, the nonlinear analysis method and nonlinear dynamic analysis methods were used in order to compare the outcomes with the intended results. Parameters such as height and lateral stiffness of the building and its impact on strength against the progressive collapse were considered. Three buildings with the Steel Moment Frames and 4, 8, and 16 stories and 3 buildings with similar heights designed by the Steel Eccentrically Braced Frames system in this field were considered. Given to obtained results by analysis, the nonlinear analysis method in comparing with the linear analysis method indicated more failures. Different parameters such as the columns removal location, number of building stories and type of the lateral carrier system will affect the results. The nonlinear dynamic analysis method used to the alternate load path method does not have any complex algorithm and can be used as an accurate method in assigning the existence or non-existence of the Alternate Load Path Method for the progressive collapse issues
  9. Keywords:
  10. Progressive Collapse Analysis ; Steel Moment Resistant Frame ; Column Removal ; Eccentrically Braced Frame (EBF)

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