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Evaluation of PR steel frame connection with torsional plate and its optimal placement

Moghadam, A ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.24200/sci.2017.4196
  3. Publisher: Sharif University of Technology , 2018
  4. Abstract:
  5. Characteristics of connections in steel moment-resisting frames are of utmost importance in determining the seismic performance of these structural systems. The results of several previous experimental studies have indicated that Partially Restrained (PR) connections possess excellent properties, which make them a reliable substitution for Fully Restrained (FR) connections. These properties include needing less base shear, being more economic, and, in many cases, being able to absorb more energy. In this study, the behavior of two proposed PR connections with torsional plate is studied through finite element simulations. The results of the numerical studies regarding initial stiffness and maximum strength capacity of the proposed connections are calibrated against the results of solid mechanics formulations. Over 50 parametric studies are performed to determine the importance of various design variables of the proposed PR connections. A relation based on spring model is proposed to estimate the maximum strength capacity of the proposed connection. Seismic performance of the proposed connection is studied in a typical portal frame with various connection characteristics using nonlinear time-history analysis. The results explicitly show that using PR connections can considerably reduce the momentrotation demands in the columns and, as a result, higher performance levels can be achieved according to ASCE41. © 2018 Sharif University of Technology. All rights reserved
  6. Keywords:
  7. Nonlinear time-history analyses ; Plastic rotation ; PR connection ; Stiffness of the connection ; Torsional plate ; Ultimate moment capacity ; Plates (structural components) ; Seismic waves ; Seismology ; Steel beams and girders ; Stiffness ; Structural frames ; Finite element simulations ; Nonlinear time history analysis ; Partially restrained connection ; Seismic Performance ; Steel moment resisting frame ; Structural systems ; Finite element method ; Connectivity ; Displacement ; Mechanics ; Nonlinearity ; Seismic response ; Steel structure ; Strength ; Structural response ; Torsion
  8. Source: Scientia Iranica ; Volume 25, Issue 3A , 2018 , Pages 1025-1038 ; 10263098 (ISSN)
  9. URL: http://scientiairanica.sharif.edu/article_4196.html