Fragility Analysis of Special Steel Moment Frame with considering the Random Parameters

Document Type : Original Article

Authors

1 Department of Civil Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran

2 Assistant Professor, Department of Civil Engineering, Jondi-Shapoor University, Dezful, Ahwaz, Iran

3 Associate Professor, Department of Civil Engineering, Payame Noor University, Tehran, Iran

Abstract

Quantifying the potential for collapse of existing structures and structures that will be designed in the future is one of the most important approaches to earthquake engineering. For this important, due to the random nature of earthquakes and uncertainties in the characteristics of the structure, statistical and probabilistic methods are used to quantify the collapse capacity of the structure. The most appropriate method is to use the expression of the probability of collapse of the structure. This expression is represented by the fragility curves of collapse. In this research, a 12-story steel structure has been designed with special moment resisting frame in accordance with the internal codes. The effect of strength and stiffness deterioration of structural elements is performed based on the Ibara-Madina-Krawinkler behavioral model. Incremental dynamic analyses are conducted under 7 pairs of far fault ground motions. Fragility curves of collapse capacity have been developed considering the random parameters of yielding moment and the capping moment of the elements and the ultimate rotation capacity of the elements. The results show that among the studied parameters, the uncertainty in the capping moment parameter has the greatest effect on structural collapse capacity and it can change to 30% the collapse probability.

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Asas Journal
Volume 24, Issue 68
Autumn 2022
December 2022

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History

  • Receive Date: 05 October 2021
  • Revise Date: 03 July 2023
  • Accept Date: 02 October 2023

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