Evaluation of Nonlinear Static Analysis for Special Moment Resisting Frames

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Evaluation of Nonlinear Static Analysis for Special Moment Resisting Frames

Original Article, D79
Vahedian V.
J. Civil Eng. Urban. 4(5): 529-533. 2014

ABSTRACT: In order to prevent extensive devastation and death toll in strong earthquakes, rehabilitation of existing structures was emphasized and after the publication of prestandards such as FEMA 274, ATC 40, FEMA 356, ATC 55, it was time for the code ASCE 41-06 to be published. In FEMA and ASCE 41, nonlinear static analysis method is considered a common approach to assess seismic behavior of structures. Considering widespread acceptance of this method (nonlinear static analysis) the question is put forward to what extent the results obtained from this approximate method are reliable. To answer this question, seven models of special steel moment resisting frames designed according to ASCE 7-05 and AISC 360- 05 and AISC 341-05 were analysed using nonlinear static and dynamic analyses based on FEMA 356 and ASCE 41-06 provisions. Comparing the results obtained from nonlinear static and dynamic analyses gives good results for low-rise buildings. In addition, it results in conservative estimates implying that this method should be considered more carefully when used for taller buildings.
Key words: Nonlinear Static Method, Special Moment Resisting Frame, Seismic Rehabilitation, Performance-Based Design

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