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Static and dynamic pushover analysis of steel moment resisting frames

Rasekh, A ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. Publisher: 2006
  3. Abstract:
  4. Pushover analysis is a simplified nonlinear analysis technique that can be used to estimate the dynamic demands imposed on a structure under earthquake excitations. One of the first steps taken in this approximate solution is to assess the maximum roof displacement, known as target displacement, using the base shear versus roof displacement diagram. That could be done by the socalled dynamic pushover analysis, i.e. a dynamic time history analysis of an equivalent single degree of freedom model of the original system, as well as other available approximate static methods. In this paper, a number of load patterns, including a new approach, are considered to construct the related pushover curves. The bi-linear and tri-linear approximation of these pushover curves were used to perform dynamic nonlinear time history analyses in order to find the target displacements. The results obtained for five different special moment resisting steel frames, using five earthquake records were compared with those resulted from the time history analysis of the original system. It is shown that the dynamic pushover analysis approach, specially, with the tri-linear approximation of the pushover curves, proves to have a better accuracy in assessing the target displacements. On the other hand, when static procedure seems adequate, no specific preference is observed in using complicated static procedures (proposed by codes) compared to the simple first mode target displacement assessment
  5. Keywords:
  6. Dynamic non-linear analysis ; FEMA 356 ; Push-over analysis ; Static non-linear analysis ; Target displacement ; Civil engineering ; Earthquakes ; Nonlinear analysis ; Roofs ; Structural design ; Structural frames
  7. Source: 10th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC 2010, Bangkok, 3 August 2006 through 5 August 2006 ; Volume 3 , 2006 , Pages 459-464 ; 9748257231 (ISBN); 9789748257235 (ISBN)